摘要
利用光学显微镜(OM)、拉伸试验和硬度测试研究了合金元素Co对马氏体时效硬化不锈钢固溶态和时效态显微组织和性能的影响。结果表明:在1040~1100℃固溶时,晶粒尺寸随温度升高而增大;含Co钢晶粒尺寸和马氏体板条束尺寸均小于不含Co试验钢。力学性能测试表明:固溶温度对固溶态试验钢的硬度几乎没有影响;随时效温度升高,钢的强度和硬度减小,伸长率增大;时效处理后含Co钢的强度和硬度均大于不含Co试验钢,伸长率变化则不明显。加入Co元素的试验钢具有良好的综合力学性能。
Effect of alloying element Co on the microstructure and mechanical properties of maraging stainless steel after solution and aging treatment was studied by means of optical microscopy (OM),tensile test and microhardness test. The results show that grain size grows larger with the increase of solution temperature. After adding cobalt,the size of the grain and martensitic slabs in the test steel are smaller than that of the non-cobalt-alloyed steel. Mechanical properties analysis show that the solution temperature has almost no influence on the hardness of the steels; with the increase of aging temperature,the strength and hardness of steels decrease,and the elongation increases.Besides,the strength and hardness of steel containing cobalt are higher than that of the non-alloyed steel after aging treatment,but the elongation has no obvious change. In a word,Adding cobalt can improve the mechanical properties of the maraging stainless steel.
引文
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