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摘要:
Several spheroidizing processes were carried out on the ultrahigh carbon steel, and the microstructures and mechanical properties of the samples under different heat treatment were observed and tested. The effect of heat treatment on microstructure and mechanical properties of the ultrahigh carbon steel was discussed. The results show that the toughness of the steel is improved remarkably with the increase of the spheroidizing ratio of carbides. The sample quenched at 840°C for 20 min and tempered at 650°C for 3 h possesses of high strength (σs=576 MPa, σb=835 MPa) and good plasticity (δ5=18.4% ) because of obtaining more round carbides. Also the sample normalized at 1200°C for 4 h and spheroidizing annealed at 800°C, for 2h has higher strength (σs=622 MPa, σb =927 MPa) with slightly low plasticity (δ5=16.0% ) because of the uniform distribution of fine spherodized carbides in it . Although there is a certain lamellar carbides in the samples annealed at 720°C for 3.5 h, as well as annealed at 840°C for 10 min and then at 720°C for 2.5 h, they have higher strength (σs greater than or equal 590 MPa, σb greater than or equal 870) and relatively low plasticity (δ5 greater than or equal 11%).
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来源 :
Heat Treatment of Metals
ISSN: 0254-6051
年份: 2006
期: 5
卷: 31
页码: 72-75
JCR分区:4