摘要
用低活化元素Ti替代高活化的Co制备9Cr3W系列钢,用金相观察、SEM观察、拉伸实验及蠕变实验等手段对其进行表征,研究了分别加入Ti和Co对9Cr3w钢力学性能的影响。结果表明,Co和Ti的添加促进析出相的析出,Ti使品粒细化,使拉伸性能和蠕变性能显著提高;Ti的添加使基体中出现少量的δ铁素体,但选择单相奥氏体区间热处理可使其消除,得到单一马氏体组织的低活化钢。对低活化9Cr3W钢进行Ti的微合金化,可获得与添加1%Co相当的良好蠕变性能。
The feasibility of replacing high activation element Co by low activation element Ti in reduced activated 9Cr3W steel was investigated in this paper. JMatPro phase diagram calculations were used as a theoretical guidance for preparing and heat treatment of experimental steels. The microstructure and mechanical properties of experimental steels were investigated by OM and SEM observation, tensile and creep tests. The results show that Ti and Co both can improve the creep properties of base steel 9Cr3W. The δ ferrite caused by Ti addition can be resolved into the matrix by choosing proper heat treatment parameters. 1%Co in reduced activation 9Cr3W steel can be replaced by 0.03%Ti.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2013年第1期43-48,共6页
Chinese Journal of Materials Research
基金
国家自然科学基金重大项目51034011
上海市教育委员会科研创新项目12ZZ026资助~~
关键词
金属材料
耐热钢
组织
析出相强化
固溶强化
metallic materials, heat resistant steel, microstructure, precipitation strengthening, sol-id solution strengthening
