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作者:

Li, Tianci (Li, Tianci.) | Zhang, Dongyun (Zhang, Dongyun.) (学者:张冬云) | Zhang, Lele (Zhang, Lele.) | Schopphoven, Thomas (Schopphoven, Thomas.) | Gasser, Andres (Gasser, Andres.) | Poprawe, Reinhart (Poprawe, Reinhart.)

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EI Scopus SCIE

摘要:

The extreme high-speed laser material deposition (EHLA) process has the potential to enable additive manufacturing for mass production by overcoming the limitations of slow scanning speed in conventional laser material deposition (LMD) processes. Thermal features are the key factors to link process and properties. A sound understanding of process-thermal-property relationships is essential for performance control and process optimization of a deposited component. In this study, we studied the thermal characteristics within a single layer and among layers for continuous processing using the numerical method, and reveal the mechanism of microstructure and hardness changes of AISI 4140 material formed by EHLA and LMD processes through the analysis of thermal properties and temperature history results. The grain size and hardness evolution for both processes during single-layer cladding and continuous forming processes were investigated. The results revealed that the grain refinement effect in continuous LMD processing is stronger than that in EHLA process (from 30.0 mu m for single layer to 3.2 mu m for multi layers vs. from 18.6 mu m for single layer to 2.2 mu m for multi layers). Similar hardness values were obtained by LMD and EHLA processes, with mean values of 511 HV and 472 HV, respectively. The yield and tensile strengths of EHLA were superior to the conventional cast material, but inferior to those of the conventional material quenched and tempered at lower temperatures. The enhanced tensile results of EHLA process were found similar to those prepared through conventional method with quench and tempering at 600 degrees C.

关键词:

Mechanical properties Microstructure AISI 4140 Extreme high-speed laser material deposition Intrinsic heat treatment

作者机构:

  • [ 1 ] [Li, Tianci]Beijing Univ Technol, Sch Phys & Optoelect Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Zhang, Dongyun]Beijing Univ Technol, Sch Phys & Optoelect Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Li, Tianci]Beijing Engn Res Ctr 3D Printing Digital Med Hlth, Beijing 100124, Peoples R China
  • [ 4 ] [Zhang, Dongyun]Beijing Engn Res Ctr 3D Printing Digital Med Hlth, Beijing 100124, Peoples R China
  • [ 5 ] [Zhang, Lele]Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China
  • [ 6 ] [Zhang, Lele]Beijing Jiaotong Univ, Natl Int Sci & Technol Cooperat Base, Beijing 100044, Peoples R China
  • [ 7 ] [Schopphoven, Thomas]Fraunhofer Inst Laser Technol ILT, Steinbachstr 15, D-52074 Aachen, Germany
  • [ 8 ] [Gasser, Andres]Fraunhofer Inst Laser Technol ILT, Steinbachstr 15, D-52074 Aachen, Germany
  • [ 9 ] [Poprawe, Reinhart]Fraunhofer Inst Laser Technol ILT, Steinbachstr 15, D-52074 Aachen, Germany

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来源 :

JOURNAL OF MANUFACTURING PROCESSES

ISSN: 1526-6125

年份: 2024

卷: 131

页码: 1372-1387

6 . 2 0 0

JCR@2022

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