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学者姓名：崔丽
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摘要 ：
In order to study the effects of ultrasonic parameters on the microstructure and mechanical properties of noncontact ultrasonic assisted laser deposition, Fe-based powder was deposited on 42CrMoA steels with different ultrasonic amplitudes (UA) and excitation distances (d). The results show that the ultrasonic-assisted laser metal deposition (LMD) of Fe-based powder increases depth and width of the deposition layers. Due to the cavitation effect of ultrasonic, it effectively refines the grains and promotes the columnar to equiaxed transition (CET) of grains at the interface. When d = 50 mm, the grain size greater than 8 mu m accounts for only 3.1 %, but the ultrasonic vibrations haven't changed the phase type of the structures. With ultrasonic-assisted, the cracks generated in the deposition layer can be effectively inhibited and the mechanical properties can be improved. When d = 80 mm and UA = 30 mu m, the average microhardness of the deposition layer reaches 772.9 HV, which is 95.8 HV higher than that without ultrasonic-assisted deposition. When UA = 40 mu m, the tensile strength is 1237.9 MPa, which is increased by 26.8 % compared to without ultrasonic-assisted deposition. Compared to without ultrasonic-assisted, the friction coefficient of deposition layers is significantly decreased by 25.5 % with the application of UA = 30 mu m.
关键词 ：
Laser metal deposition (LMD) Laser metal deposition (LMD) Columnar to equiaxed transition (CET) Columnar to equiaxed transition (CET) Ultrasonic-assisted Ultrasonic-assisted Tensile property Tensile property Friction performance Friction performance Fe-based powder Fe-based powder
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| GB/T 7714 | Li, Huachen , Cui, Li , He, Dingyong et al. Effect of ultrasonic parameters on microstructure and mechanical properties of non-contact ultrasonic-assisted laser metal deposition of Fe-based powder [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 176 . |
| MLA | Li, Huachen et al. "Effect of ultrasonic parameters on microstructure and mechanical properties of non-contact ultrasonic-assisted laser metal deposition of Fe-based powder" . | OPTICS AND LASER TECHNOLOGY 176 (2024) . |
| APA | Li, Huachen , Cui, Li , He, Dingyong , Shi, Zhenfu , Bu, Fanhui , Cao, Qing et al. Effect of ultrasonic parameters on microstructure and mechanical properties of non-contact ultrasonic-assisted laser metal deposition of Fe-based powder . | OPTICS AND LASER TECHNOLOGY , 2024 , 176 . |
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摘要 ：
Fe-based powder was manufactured on 42CrMoA steel substrate using non-contact ultrasonic vibration-assisted (UVA) laser metal deposition(LMD) process with different exciting distances(d), and the temperature field and stress field distribution, microstructure and mechanical properties of the deposited layers were investigated. The results show that the distribution of temperature field was more uniform, especially at the bottom of the molten pool, and the gradient of temperature field decreased. Compared with the condition without UVA, the residual stress peak value of the tensile stress area decreased significantly after UVA applied. When d=80 mm, the peak tensile stress and compressive stress were 90.5 MPa and 72.6 MPa, respectively, which were reduced by 45.6 % and 25.2 % compared with the condition without UVA. The length of the columnar crystals and the region of the columnar crystals decreased at the interface after UVA applied. The application of UVA can significantly improved the microhardness of deposition layer. With the reduction of the residual stress at the interface and the improvement of uniformity, the tensile properties of the deposit were also significantly improved. The highest tensile strength was 1281.3 MPa when d=80 mm, which was 30.12 % higher than that without UVA.
关键词 ：
Laser metal deposition(LMD) Laser metal deposition(LMD) (UVA) (UVA) Mechanical property Mechanical property Microstructure Microstructure Numerical simulation Numerical simulation Non-contact ultrasonic vibration-assisted Non-contact ultrasonic vibration-assisted
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| GB/T 7714 | Li, Huachen , Cui, Li , He, Dingyong et al. Non-contact ultrasonic vibration-assisted laser metal deposition manufacturing Fe-based powder: Numerical simulation and experimental investigation [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 40 . |
| MLA | Li, Huachen et al. "Non-contact ultrasonic vibration-assisted laser metal deposition manufacturing Fe-based powder: Numerical simulation and experimental investigation" . | MATERIALS TODAY COMMUNICATIONS 40 (2024) . |
| APA | Li, Huachen , Cui, Li , He, Dingyong , Shi, Zhenfu , Bu, Fanhui , Cao, Qing et al. Non-contact ultrasonic vibration-assisted laser metal deposition manufacturing Fe-based powder: Numerical simulation and experimental investigation . | MATERIALS TODAY COMMUNICATIONS , 2024 , 40 . |
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摘要 ：
Vanadium (V) interlayers of 0.4 mm, 0.8 mm, and 1.2 mm thickness were firstly deposited on the TC4 alloy side using a laser metal deposition (LMD) process, which was then combined with a CuCrZr plate as a composite intermediate layer, for dissimilar laser welding of TC4 titanium alloys to 304 stainless steels (SS) successfully. The effects of different thicknesses of V interlayers on the weld shape, microstructure and mechanical properties of TC4/304SS joints were investigated. The results show that a sound TC4/304SS butt joint with full penetration is successfully obtained using the prepared composite interlayer. The TC4/304SS joint exhibits a maximum ultimate tensile strength (UTS) of 418 MPa and an elongation index (EI) of 15 % with a V layer thickness of 1.2 mm. With the V-layer thickness increasing, the size and content of the V-Cu solid solution in the fusion zone (FZ) on the TC4 alloy side are gradually increased without the formation of intermetallic compounds (IMCs) generated.
关键词 ：
Stainless steel Stainless steel Titanium alloys Titanium alloys Composite interlayer Composite interlayer Dissimilar welding Dissimilar welding
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| GB/T 7714 | Shi, Zhenfu , Cui, Li. , He, Dingyong et al. Enhanced strength of laser welded steel/titanium butt joints with vanadium multi-layers and a copper plate as a composite intermediate layer [J]. | OPTICS AND LASER TECHNOLOGY , 2024 , 180 . |
| MLA | Shi, Zhenfu et al. "Enhanced strength of laser welded steel/titanium butt joints with vanadium multi-layers and a copper plate as a composite intermediate layer" . | OPTICS AND LASER TECHNOLOGY 180 (2024) . |
| APA | Shi, Zhenfu , Cui, Li. , He, Dingyong , Huang, Zhekai , Li, Huachen , Cao, Qing et al. Enhanced strength of laser welded steel/titanium butt joints with vanadium multi-layers and a copper plate as a composite intermediate layer . | OPTICS AND LASER TECHNOLOGY , 2024 , 180 . |
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摘要 ：
A new type of Al-Mg-Er-Zr alloy was welded by a gas metal arc welding (GMAW) process. The effect of GMAW welding on the microstructure, microtexture, and mechanical properties was investigated and compared with the base material (BM). The results show that GMAW welding leads to a change in the grain shape, grain orientations, phase composition, microtexture, microhardness, and tensile properties. The weld metal (WM) exhibits coarse grains, high proportion of high angle grain boundaries (HAGBs), and low intensities of random textures compared with the BM. In addition, the recrystallization occurs in the HAZ due to the welding heat effect; grains and secondary phases are coarsened compared with the BM. The texture evolution in the HAZ exhibits the disappearance of the deformation textures, along with the transformation and competitive growth of P, R, and Cube recrystallization textures. The average ultimate tensile strength (UTS) of the GMAW joints is 280.7 MPa, and the lowest hardness of 75.2 HV is located in the WM. Compared to the BM, the welded joints in the Al-Mg-Er-Zr alloy produce reduced microhardness and tensile properties. However, the strength coefficient of the welded joints reaches 0.75, together with the elongation index (EI) of 11.4%, implying GMAW welding for the Al-Mg-Er-Zr alloys achieves a good combination of strength and ductility.
关键词 ：
Mechanical properties Mechanical properties Al-Mg-Er-Zr alloy Al-Mg-Er-Zr alloy Microstructure Microstructure Gas metal arc welding Gas metal arc welding
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| GB/T 7714 | Wang, Peng , Cui, Li , Wei, Wu et al. Effect of gas metal arc welding on microstructure, microtexture, and mechanical properties of a new type Al-Mg-Er-Zr alloy [J]. | WELDING IN THE WORLD , 2024 , 68 (6) : 1591-1609 . |
| MLA | Wang, Peng et al. "Effect of gas metal arc welding on microstructure, microtexture, and mechanical properties of a new type Al-Mg-Er-Zr alloy" . | WELDING IN THE WORLD 68 . 6 (2024) : 1591-1609 . |
| APA | Wang, Peng , Cui, Li , Wei, Wu , Huang, Hui , He, Dingyong . Effect of gas metal arc welding on microstructure, microtexture, and mechanical properties of a new type Al-Mg-Er-Zr alloy . | WELDING IN THE WORLD , 2024 , 68 (6) , 1591-1609 . |
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摘要 ：
In this work, heat treatments were performed on autogenously laser welding of laser powder bed fusion (LPBF) AlSi10Mg alloys to improve mechanical properties of welded joints. After welding, the welded joint was heat treated by direct aging (DA) and solution heat treatment and artificial aging (T6) treatment. The porosity, microstructure and mechanical performance of the welded joints after DA and T6 treatments were investigated and compared with the as-welded joint. Results show that the microhardness of weld metal (WM) has been increased to over 93.5 HV0.1 after DA treatment, while the microhardness in the T6 welded joint is reduced to 77.0 HV0.1, from 82.0 HV0.1 in the as-welded joint. The ultimate tensile strength (UTS) of the DA treated joint reaches 276.5 MPa, showing an increase of 43.0% compared with as-welded joint. The DA heat treatment of the LPBF AlSi10Mg welded joints effectively improves the hardness and the UTS, which can be mainly attributable to the reduction of the hydrogen pores, the enhancing effect of solid solution strengthening coming from the Si element in the Al matrix and the dispersion strengthening of Si precipitation.
关键词 ：
Laser welding Laser welding Microstructure Microstructure T6 treatment T6 treatment LPBF AlSi10Mg alloy LPBF AlSi10Mg alloy Direct aging treatment Direct aging treatment Mechanical properties Mechanical properties
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| GB/T 7714 | Wang, Can , He, Dingyong , He, Chengxing et al. Effect of heat treatments on microstructure and mechanical behavior of laser welded LPBF AlSi10Mg alloys [J]. | MATERIALS TODAY COMMUNICATIONS , 2024 , 38 . |
| MLA | Wang, Can et al. "Effect of heat treatments on microstructure and mechanical behavior of laser welded LPBF AlSi10Mg alloys" . | MATERIALS TODAY COMMUNICATIONS 38 (2024) . |
| APA | Wang, Can , He, Dingyong , He, Chengxing , Han, Feiyang , Li, Jingchuan , Cui, Li . Effect of heat treatments on microstructure and mechanical behavior of laser welded LPBF AlSi10Mg alloys . | MATERIALS TODAY COMMUNICATIONS , 2024 , 38 . |
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摘要 ：
一种电弧增材制造高强Al‑Mg系合金成形件的方法，涉及铝合金增材制造领域。电弧增材制造(WAAM)工艺制备Al‑Mg系合金越来越受到广泛的关注，但目前已有的WAAM工艺制备Al‑Mg系合金强度不高，绝大部分无法达到工业使用的需求。本专利采用熔化极惰性气体保护(MIG)增材制造系统，以高镁焊丝(Mg 5.5～6.8wt％，Zr≤0.1wt％)为丝材，采用单道摆动的方式往复式逐层沉积成形，调控焊接工艺参数，获得成形优良的高强Al‑Mg系铝合金成形件，抗拉强度最高达365.0MPa，断后延伸率为25.5％，具有优良的强度和塑性结合。
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| GB/T 7714 | 崔丽 , 翟利民 , 贺定勇 et al. 一种电弧增材制造高强Al-Mg系合金成形件的方法 : CN202310211381.7[P]. | 2023-02-27 . |
| MLA | 崔丽 et al. "一种电弧增材制造高强Al-Mg系合金成形件的方法" : CN202310211381.7. | 2023-02-27 . |
| APA | 崔丽 , 翟利民 , 贺定勇 , 黄晖 , 魏午 . 一种电弧增材制造高强Al-Mg系合金成形件的方法 : CN202310211381.7. | 2023-02-27 . |
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摘要 ：
本发明公开了一种竹笋结构W‑Zr基非晶合金复合材料及其制备方法与应用，涉及金属复合材料技术领域，复合材料的整体结构上分别存在硬脆区和软韧区，其中硬脆区体积分数为10％～30％，软韧区体积分数为70％～90％，两区域呈锥形交替分布，其分布为仿生竹笋结构，这种竹笋结构的优势在于：在高应变速率条件下，软韧区先发生变形，随着变形程度增加，软韧区与硬脆区同时变形，随后硬脆区开裂，沿着设计结构方式分离脱落，重新露出尖锐区域完成自锐化，类似竹笋剥落；循环此步骤，完成侵彻过程，可显著增加穿甲弹威力。
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| GB/T 7714 | 谈震 , 席钊 , 宁子阳 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3[P]. | 2023-01-17 . |
| MLA | 谈震 et al. "一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用" : CN202310055654.3. | 2023-01-17 . |
| APA | 谈震 , 席钊 , 宁子阳 , 贺定勇 , 周正 , 郭星晔 et al. 一种竹笋结构W-Zr基非晶合金复合材料及其制备方法与应用 : CN202310055654.3. | 2023-01-17 . |
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摘要 ：
本发明涉及一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法，涉及增材制造技术及微通道散热技术领域。本发明利用激光增材制造技术，按照所设计微通道结构的模型进行切片处理、区域划分及激光扫描策略规划，通过不同区域的激光工艺参数、激光扫描策略与钨铜粉末比例匹配，一体成形制备出具有钨骨架结构的钨铜复合材料微通道散热器，随后对微通道进行磨粒流抛光后处理，使微通道具有适宜的内表面粗糙度。所制备的微通道散热器散热性能优良，热膨胀系数能与电子元件的基体材料相匹配，钨骨架显著改善散热器高温性能并实现结构功能一体化，为微电子领域提供更有效率、成本更低的散热解决方案。
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| GB/T 7714 | 贺定勇 , 李小璇 , 谈震 et al. 一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法 : CN202310249027.3[P]. | 2023-03-15 . |
| MLA | 贺定勇 et al. "一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法" : CN202310249027.3. | 2023-03-15 . |
| APA | 贺定勇 , 李小璇 , 谈震 , 郭星晔 , 邵蔚 , 周正 et al. 一种具有钨骨架结构的钨铜复合材料微通道散热器及其制备方法 : CN202310249027.3. | 2023-03-15 . |
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摘要 ：
Laser metal deposition process was introduced to join AlSi10Mg alloys fabricated by powder bed fusion-laser beam/metal to improve the tensile strength of laser welded joints. The size and the porosity of the hydrogen pores in the weld seam are significantly reduced by laser metal deposition welding. The ultimate tensile strength of the welded joint by using laser metal deposition reaches 318.8 MPa, and the microhardness of the weld seam ranges from 99.5 to 105.4 HV. Compared with single-pass welding, the ultimate tensile strength and hardness are increased by 60.6% and 27.6%. This is mainly attributed to the reduced porosity, refined & alpha;-Al structures and increased connectivity of the Si-rich networks of the weld seam achieved by laser metal deposition welding.
关键词 ：
porosity porosity microstructure microstructure PBF-LB/M AlSi10Mg alloys PBF-LB/M AlSi10Mg alloys mechanical properties mechanical properties LMD welding LMD welding
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| GB/T 7714 | Wang, Can , He, Dingyong , Cui, Li et al. Improved tensile strength of welded AlSi10Mg alloys by using laser metal deposition [J]. | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2023 , 28 (9) : 946-954 . |
| MLA | Wang, Can et al. "Improved tensile strength of welded AlSi10Mg alloys by using laser metal deposition" . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING 28 . 9 (2023) : 946-954 . |
| APA | Wang, Can , He, Dingyong , Cui, Li , Shi, Zhenfu , Guo, Xingye , Wu, Xu et al. Improved tensile strength of welded AlSi10Mg alloys by using laser metal deposition . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2023 , 28 (9) , 946-954 . |
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摘要 ：
Surface pretreatment is of great significance for improving the welding quality of metal materials, especially aluminum alloys. At present, the welding process is introduced to join the laser powder bed fusion (LPBF) AlSi10Mg alloys or their repair during manufacturing or service. However, the high susceptibility of hydrogen pores is one of the most important problems encountered in the fusion welding process of LPBF AlSi10Mg alloys. To clarify the influence of the surface state of the base metal on the hydrogen pore characteristics, the LPBF AlSi10Mg sheets were pretreated by chemical cleaning treatment (CCT), mechanical polishing treatment (MPT), and chemical cleaning treatment after mechanical polishing treatment (MPT-CCT) before laser welding. Subsequently, the hydrogen pore characteristics, microstructure, and micro-hardness of the welded joints were investigated. The experimental results show that laser welding with MPT-CCT significantly reduces the porosity and pore diameter. In addition, MPT-CCT can eliminate most of the broken and discontinuous surface oxide film and Mg enrichment. In summary, the necessity of MPT-CCT for LPBF AlSi10Mg alloys is analyzed systematically, which is of great significance to improve the welding quality.
关键词 ：
Surface pretreatment Surface pretreatment Porosity Porosity LPBF AlSi10Mg alloys LPBF AlSi10Mg alloys Microstructure Microstructure Mechanical properties Mechanical properties
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| GB/T 7714 | Wang, Can , He, Dingyong , Cui, Li et al. Influence of surface pretreatment on porosity and microstructure of laser welding in AlSi10Mg alloys sheets fabricated by laser powder bed fusion [J]. | WELDING IN THE WORLD , 2023 , 67 (11) : 2449-2462 . |
| MLA | Wang, Can et al. "Influence of surface pretreatment on porosity and microstructure of laser welding in AlSi10Mg alloys sheets fabricated by laser powder bed fusion" . | WELDING IN THE WORLD 67 . 11 (2023) : 2449-2462 . |
| APA | Wang, Can , He, Dingyong , Cui, Li , Guo, Xingye , Tan, Zhen , Wu, Xu . Influence of surface pretreatment on porosity and microstructure of laser welding in AlSi10Mg alloys sheets fabricated by laser powder bed fusion . | WELDING IN THE WORLD , 2023 , 67 (11) , 2449-2462 . |
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