北京科技大学学报2011，Vol.33Issue(2)：166-171,6.
中国低活化马氏体钢组织性能及强化机理
Microstructure, properties and strengthening mechanism of China low activation martensitic steel
摘要
Abstract
The relationship among the microstructure, precipitation behavior and mechanical properties of China low activation martensitic (CLAM) steel was studied by optical microscopy, transmission electron microscopy (TEM) and chemical phase analysis.It is shown that the quenched microstructure is martensite, but after being tempered at 760℃ the microstructure transforms into finer and more homogeneous sorbite. The tensile strength, yield strength and elongation of the steel at room temperature are 697 MPa, 652 MPa and 24.4％ , respectively; however, at 600℃ their values are 453 MPa, 452 MPa and 23％ , respectively. The ductile-brittle transition temperature (DBTT) is -60℃. The second phase particles, sized from 30 to 70 nm, mainly are M23C6 and Ta(C, N) with FCC crystal structures. The particles, mostly distributed at grain boundaries but few dispersively in grains, can produce precipitation strengthening, as the key strengthening mechanism of the steel.关键词
马氏体钢/力学性能/微观组织/强化Key words
martensitic steel/ mechanical properties/ microstructure/ strengthening分类
金属材料引用本文复制引用
李华杰,武会宾,唐荻..中国低活化马氏体钢组织性能及强化机理[J].北京科技大学学报,2011,33(2):166-171,6.基金项目
国家重点基础研究发展计划资助项目(No.2007ID102) （No.2007ID102）
