球化退火工艺对高碳马氏体不锈钢8Cr13MoV组织及性能的影响

为了优化高碳马氏体不锈钢8Cr13MoV的球化热处理工艺,提高其退火后的冷加工性能,采用微观组织分析法以及拉伸力学分析法研究了球化退火过程中奥氏体化保温时间和冷却速率对8Cr13MoV钢的球化效果影响。结果表明, 随着奥氏体保温时间的增加,组织中细颗粒状碳化物数量减少,索氏体数量增多,试样硬度先降低后升高,但断后伸长率持续增加;随冷却速率增加,试样组织中细颗粒状碳化物和索氏体数量、硬度和强度增加,断后伸长率降低。综合对比,奥氏体保温时间?90 min时试样综合力学性能较好,冷却速率应控制在25 ℃·h^-1以内。与奥氏体保温时间相比,冷却速率对力学性能的影响更加显著。

Effect of spheroidizing annealing on microstructure and mechanical properties of high-carbon martensitic stainless steel 8Cr13MoV

In order to optimize the spheroidizing heat treatment process of high carbon martensitic stainless steel 8Cr13MoV and improve its cold working properties after annealing, the effects of austenitizing time and cooling rate on the spheroidization effect of 8Cr13MoV steel during the spheroidizing annealing process were investigated by microstructure analysis and tensile mechanical test. The obtained results indicate that with the increase of austenite holding time, the number of fine carbides decreases, while the number of sorbite increases. The hardness of the steel decreases first and then increases, and the elongation increases. The number of fine carbides and sorbite, the hardness and strength of the steel increase with the cooling rate increasing, while the elongation decreases. Comprehensive comparison shows that the comprehensive mechanical properties of the 8Cr13MoV steel are preferable when the austenitic holding time is 90 min, and the cooling rate should be controlled within 25 ℃·h^-1. Compared with holding time, the influence of cooling rate on the mechanical properties is more remarkable.