氮对淬火-配分超级马氏体不锈钢组织和性能的影响  

Effect of Nitrogen on Microstructure and Properties of Quenched and Partitioned Super Martensitic Stainless Steel

作　　者：庞阳 邹德宁[1] 李雨浓 李苗苗 闫星宇 何婵 PANG Yang;ZOU Dening;LI Yunong;LI Miaomiao;YAN Xingyu;HE Chan(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,西安710055

出　　处：《材料研究学报》2022年第10期786-792,共7页Chinese Journal of Materials Research

基　　金：国家自然科学基金(51774226);山西省科技重大专项(20181101016,20191102006)。

摘　　要：对超级马氏体不锈钢进行氮合金化并进行淬火-配分工艺处理,使用OM、SEM、TEM、EBSD、BSD、万能试验机和维氏硬度计等手段对不含氮和氮含量(质量分数)分别为0.23%、0.35%的三组超级马氏体不锈钢进行表征,研究了氮元素对其组织和性能的影响。结果表明:氮的添加细化了实验钢中的马氏体板条,使其平均宽度由2.93μm减小到0.65μm。在配分处理过程中较高的氮富集度为逆变奥氏体的生成提供了驱动力,并使其稳定到室温。在钢中添加氮元素使钢的强度和塑性均明显比0 N试验钢的高,0.23 N和0.35 N试验钢的抗拉强度和延伸率分别为1510 MPa、24.2%和1215 MPa和35.1%。由此可见,氮合金化有利于提高超级马氏体不锈钢的力学性能。A super martensitic stainless steel was alloyed with nitrogen,and afterwards subjected to quenching and partitioning treatments.Then the performance of three super martensite stainless steels without and with 0.23%and 0.35%nitrogen(in mass fraction),respectively were characterized by means of OM,SEM,TEM,EBSD,BSD,universal testing machine and Vickers hardness tester,in terms of the effect of nitrogen on their microstructure and mechanical properties.The results show that:The addition of nitrogen refines the martensitic slats of the steels,and of which the average width was reduced from 2.93μm to 0.65μm.During the partitioning treatment,the high nitrogen concentration provides a driving force for the formation of inverting austenite and facilitates its stabilizing at room temperature.The strength and plasticity of the steels alloyed with nitrogen are obviously higher than those of the nitrogen free ones,the tensile strength and elongation of steels with 0.23 N and 0.35 N are 1510 MPa and 24.2%,and 1215 MPa and 35.1%,respectively.It can be seen that nitrogen alloying is beneficial to improve the mechanical properties of super martensitic stainless steel.

关 键 词：金属材料 超级马氏体不锈钢 Q&P工艺 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]