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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 microstructure, precipitation behavior and properties of low-activation-martensitic (CLAM) steels in China were studied by means of optical microscope, transmission electron microscopy and chemical phase analysis.The results show that the quenched microstructure of CLAM steel is martensite, After tempering at 760 ℃, the microstructure changes to small and uniform sorbite.The tensile strength at room temperature is 697MPa, the yield strength is 652MPa, the elongation is 24.4%, the tensile strength is 453MPa at 600 ℃, the yield strength is 452MPa, The elongation is 23%, the ductile-brittle transition temperature is -60 ° C. The precipitates in the CLAM steel are mainly M23C6 and Ta (C, N) at 30-70 nm, which are mainly distributed in the grain boundaries and dispersed in a small amount in the crystal Of precipitates is one of the main ways to strengthen CLAM steel.