Mo与Co含量对18Ni马氏体时效钢性能的影响  

Effects of Mo and Co content on properties of 18Ni maraging steel

作　　者：章伟钢 周芸[1] 刘少尊[2] 厉勇[2] 王春旭[2] Zhang Weigang;Zhou Yun;Liu Shaozun;Li Yong;Wang Chunxu(College of Material Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093;Institute of Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《金属热处理》2018年第4期48-52,共5页Heat Treatment of Metals

摘　　要：采用Formastor-Ⅲ型全自动相变仪对3种马氏体时效钢的Ms、Mf点温度及其力学性能进行测试，确定了2800MPa级马氏体时效钢的最佳热处理制度。利用扫描电镜和透射电镜研究了co及Mo含量对其组织与性能的影响。结果表明：Co含量增加使Ms点和Mf点温度分别提高了71℃和91℃，Mo含量的增加使Ms点温度降低192cC，并且使Mf点温度降至室温以下；co含量的增加对试验钢的峰时效温度影响不大，而Mo含量的增加使其提高了20℃；Co对试验钢强度有一定贡献，但并不如Mo的影响。The Ms and Mf point temperature and mechanical properties of three tested steels were measured by phase transformation tester, the optimum heat treatment process of 2800 MPa grade maraging steel was determined. Effects of Co and Mo content on microstrueture and properties were studied by scanning electron microscope and transmission electron microscopy. The results show that with the increase of Co content, the temperature of Ms and Mf increases 71 ℃ and 91 ℃ respectively; with the increase of Mo content, the temperature of Ms decreases by 192 ℃ and make the temperature of its Mf point below room temperature. The increase of Co content has little effect on the peak-aging temperature, but the peak-aging temperature increases by 20 ℃ with the increase of Mo content. Co has certain extent of contribution to the strength of the steel, but it is not as good as Mo.

关 键 词：Co MO 马氏体时效钢 Ms MF 峰时效温度 强度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]