机械合金化及热压烧结制备Fe-Cr-Mn基超细晶奥氏体不锈钢研究  

Study on Fe-Cr-Mn-based Ultra-fine Grain Austenitic Stainless Steel Prepared by Mechanical Alloying and Hot Pressing Sintering

作　　者：孙崇锋 党晓凤 席生岐[2] 李建平[1] 高圆[2] 郭永春[1] 杨忠[1] 白亚平[1] Sun Chongfeng;Dang Xiaofeng;Xi Shengqi;Li Jianping;Gao Yuan;Guo Yongchun;Yang Zhong;Bai Yaping(School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China;State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安工业大学材料与化工学院,陕西西安710021 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2021年第2期600-606,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51271143);装备预研领域基金重点项目(6140922010301);陕西省创新能力支撑计划(2017KCT-05);陕西省工业攻关计划(2010K10-05);中央高校基本科研业务费。

摘　　要：采用高能研磨诱导的机械合金化方法制备了Fe-Cr-Mn基不锈钢合金粉末;对机械合金化粉末分别进行了退火和热压烧结,分析了退火过程中的相变规律,并对热压烧结获得的奥氏体不锈钢进行了组织和耐蚀性能研究。结果表明:机械合金化获得的不锈钢合金粉由亚稳态的纳米晶铁素体构成;退火/热压烧结处理后,铁素体逐渐转变为热力学上更加稳定的奥氏体,相变温度介于498℃到730℃之间;对机械合金化16 h的合金粉末在900℃、200 MPa条件下热压烧结1h获得了Fe-Cr-Mn基奥氏体不锈钢,其平均晶粒尺寸为亚微米级且表现出高硬度和良好的耐蚀性能,其HV硬度值约为5350 MPa、自腐蚀电位和自腐蚀电流密度分别为–0.28 V和1.43×10^(-9)A·cm^(-2)。Fe-Cr-Mn-based stainless steel alloy powder was prepared by mechanical alloying method which is induced by high energy milling. The milled powders were annealed and sintered via hot pressing sintering method, respectively, and their phases evolution, microstructure and corrosion resistance were analysed. The results show that the Fe-Cr-Mn-based stainless steel alloy powder prepared by mechanical alloying is mainly composed of metastable nanocrystalline ferrite phase. After annealing or hot pressing sintering, ferrite phase transforms into austenite phase, and the transformation temperature ranges from 498 °C to 730 °C. The powder milled for 16 h is hot pressed at 900 °C and 200 MPa for 1 h for bulk alloy. The average grain size of pressed bulk alloy is submicron, which displays high hardness and good corrosion resistance. The hardness, polarization voltage and polarization current are 5350 MPa,-0.28 V and 1.43×10^(-9) A·cm^(-2), respectively.

关 键 词：机械合金化 热压烧结 Fe-Cr-Mn基奥氏体不锈钢 组织 耐蚀性能 

分 类 号：TG142.25[一般工业技术—材料科学与工程] TG142.71[金属学及工艺—金属材料]