锰对高氮超级马氏体不锈钢组织与性能的影响  

Effect of manganese on microstructure and properties of high nitrogen super martensitic stainless steel

作　　者：庞阳 邹德宁[1] 吕香 李苗苗 闫星宇 PANG Yang;ZOU De-ning;Lü Xiang;LI Miao-miao;YAN Xing-yu(School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,Shaanxi,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《钢铁》2021年第3期34-40,共7页Iron and Steel

基　　金：国家自然科学基金资助项目(51774226);山西省科技重大专项资助项目(20181101016,20191102006);陕西省重点研发计划资助项目(2018ZDXM-GY-149)。

摘　　要：为了进一步提高超级马氏体不锈钢的强塑性能和优良耐腐蚀能力,在实验室条件下研发制备了氮质量分数为0.35%、锰质量分数分别为0.4%和2.0%的2种新型超级马氏体不锈钢试料,并采用淬火-配分的工艺对其进行处理;借助万能试验机、光学显微镜、扫描电镜、透射电镜和电子背散射衍射等方法对试验钢的微观组织和力学性能进行表征测试。研究表明,2种试验钢经一定制度的淬火-配分处理后,力学性能相比典型超级马氏体不锈钢均有显著提升;同时发现锰元素含量对试验钢强塑性能影响显著,锰质量分数由0.4%提升到2.0%时,试验钢的抗拉强度和伸长率分别由1690MPa、15.2%改变为1215 MPa、35.1%,均突破了传统超级马氏体不锈钢的强塑性能指标;分析认为强塑性显著提升的原因是氮-锰元素协同作用使淬火-配分后残余奥氏体含量增加显著,并伴随纳米级逆变奥氏体和氮化物析出所致。In order to further improve the strength and toughness and excellent corrosion resistance of super martensitic stainless steel,two new super martensitic stainless steels with nitrogen of 0.35%and manganese of 0.4%and 2.0%(mass percent)were developed and prepared under laboratory conditions,which are processed by quenching and partitioning process;The microstructure and mechanical properties of the steel were characterized by universal testing machine,optical microscope,scanning electron microscope,transmission electron microscope and electron backscattering diffraction.The results show that the mechanical properties of the two kinds of test steels are significantly improved compared with that of typical super martensitic stainless steels after quenching and partitioning.At the same time,it is found that manganese has a significant influence on the strength and toughness of the test steel.When the mass percent of manganese increases from 0.4%to 2.0%,the tensile strength and elongation of the test steel change from 1690 MPa and 15.2%to 1215 MPa and 35.1%,respectively,which both break the strength and toughness indexes of traditional super martensitic stainless steel.It is concluded that the reason for the significant improvement of strength and toughness is that the retained austenite content increases significantly after quenching and partitioning due to the synergistic effect of nitrogen and manganese,which is also caused by the precipitation of nano-scale reversed austenite and nitride.

关 键 词：锰元素 高氮超级马氏体不锈钢 Q&P工艺 逆变奥氏体 力学性能 

分 类 号：TG142.71[一般工业技术—材料科学与工程]