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

作　　者：李华杰[1] 武会宾[1] 唐荻[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《北京科技大学学报》2011年第2期166-171,共6页Journal of University of Science and Technology Beijing

基　　金：国家重点基础研究发展计划资助项目(No.2007ID102)

摘　　要：通过光学显微镜、透射电镜和化学相分析等方法研究了中国低活化马氏体(CLAM)钢的组织特征、析出行为及其与性能的关系.结果表明:CLAM钢淬火态组织为马氏体,760℃回火后组织转变为细小均匀的索氏体.其室温下的抗拉强度为697MPa,屈服强度为652MPa,延伸率为24.4%;600℃时抗拉强度为453MPa,屈服强度为452MPa,延伸率为23%.韧脆转变温度为-60℃.CLAM钢中的析出物主要为30～70 nm的M23C6和Ta(C,N),这些主要分布在晶界且少量弥散分布于晶内的析出物是强化CLAM钢的主要方式之一.The relationship among the inierostructure, 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 mierostrueture 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 

分 类 号：TG142.74[一般工业技术—材料科学与工程]