Si添加对高Mn-N型TWIP不锈钢力学性能的影响研究  

Study on the influence of Si addition on the mechanical properties of high Mn-N type TWIP stainless steels

作　　者：曾泽瑶 罗许 Zeng Zeyao;Luo Xu(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China)

机构地区：[1]钒钛资源综合利用国家重点实验室,四川攀枝花617000

出　　处：《钢铁钒钛》2024年第4期170-175,共6页Iron Steel Vanadium Titanium

摘　　要：利用SEM、TEM等分析手段研究了不同热处理工艺制度对1.5%Si添加后的高Mn-N TWIP不锈钢显微组织和力学性能的影响。结果发现,试验钢退火孪晶厚度随着固溶温度的升高而增大,在高的固溶温度下,Si添加可以提高合金的应变硬化率,拉伸变形过程中生成大量细长的形变孪晶可以有效阻碍位错滑移,提高材料强度与塑性。时效处理对拉伸性能影响较小,在700~800℃时效过程中生成大量晶界胞状析出物,胞状析出以短棒状Cr_(2)N为主,在冲击载荷作用下会发生沿晶脆性断裂,冲击吸收功快速降低。The effects of different heat treatment processes on the microstructure and mechanical properties of high Mn-N TWIP stainless steels with 1.5%Si addition were studied by SEM and TEM.The results showed that the annealing twin thickness of the tested steel increased with the increase in solution temperature.At high solution temperatures,Si was added to improve the strain hardening rate of the alloy.A large number of slender deformation twins were generated during tensile deformation,which can effectively prevent dislocation slip and improve materials strength and plasticity.The effect of aging treatment on the materials tensile properties was relatively small.During the aging process at 700~800℃,a large amount of grain boundary cellular precipitates were generated,which were mainly composed of short rod-shaped Cr_(2N)particles.Under impacting loads,intergranular brittle fracture occurred,and the impact absorption energy decreased rapidly.

关 键 词：TWIP不锈钢 Si 析出相 沿晶断裂 冲击韧性 

分 类 号：TF76[冶金工程—钢铁冶金] TG142[一般工业技术—材料科学与工程]