热处理对奥氏体不锈钢00Cr18Ni10N组织和性能的影响

Influence of Heat Treatment on Microstructure and Mechanical Property of Austenitic Stainless Steel

通过对新型奥氏体不锈钢00Cr18Ni10N的热处理工艺试验,研究了不同固溶温度、冷却方式和保温时间对其组织性能的影响。结果表明,随着固溶温度的升高,00Cr18Ni10N钢晶粒变大,力学性能降低,塑性提高。随着保温时间的延长,拉伸强度、屈服强度和硬度都有所降低,断后伸长率略有提高,冲击韧性和断面收缩率变化并不显著。虽然冷却方式对其力学性能和晶粒大小的影响并不是很明显,但在1050℃淬火,采用水冷可以到达更好的综合性能。因此,00Cr18Ni10N钢采用1050℃固溶、保温1h后水冷的热处理工艺具有良好的组织和强韧性配合。

The effects of different solution temperature,cooling method,and holding time on the microstructure are introduced and performance of a new austenitic stainless steel 00Cr18Ni10N has been investigated through a series of heat treatment process tests.Increasing solution temperature can accelerate austenitic formation and uniformity process,also increase the solubility of carbides,nitrides,and carbonitrides in the matrix,and improve the stability of austenite.The results show that the grain size of the material becomes larger with the solution temperature increasing,meanwhile,the mechanical properties are decreased and plastic property is improved.With holding time increasing,the tensile strength,yield strength,and hardness decrease,the percentages elongation after fracture increase,and the impact toughness and section reduction rate do not change significantly.Although the influence of cooling methods on mechanical properties and grain size is not significant,but it could obtain better comprehensive performance using water-cooling after the 1050℃ solution treatment.Consequently,the stainless steel reaches a good combination of strength and toughness after a solution treatment at the temperature of 1050℃ and water quenching after holding an hour.