钼对低碳钢高温力学性能的影响  

Influence of molybdenum on high temperature mechanical properties of low carbon steel

作　　者：胡敏[1] 郑华[1] 王玉涛[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《金属热处理》2009年第6期24-28,共5页Heat Treatment of Metals

摘　　要：以新一代高炉炉壳用钢的开发为背景,采用低Mo或无Mo的成分设计,研究了Mo对热轧态、回火态和正火态低碳钢组织和高温拉伸性能的影响。结果表明,试验钢热轧态组织均为铁素体+珠光体+M-A岛,其屈服强度可保持至400℃而不明显降低;回火后,岛状马氏体组织消失,试验钢屈服强度在室温～600℃范围内随拉伸温度升高而线性下降。Mo的添加提高了回火时第二相的析出温度,并使正火态组织中含有大量M-A岛。含Mo试验钢在回火后具有更高的室温和高温强度,经640℃回火后,其常温屈服和抗拉强度依次为540 MPa和625 MPa,屈强比为0.86,600℃屈服强度保持率为55%。Under the background of developing new generation steel applied in making the shell of blast furnace, Mo-added and Mo-free low carbon steels were prepared and the influence of molybdenum on microstrncture and high temperature mechanical properties were investigated. The yield strength of as-rolled steels with F ＋ P ＋ M-A metallurgical structure can be maintained up to 400℃. After being tempered at 600 ℃ and 640 ℃, the M-A islands are eliminated and the yield strength decreases linearly with the increase of tensile temperature from ambient to 600 ℃. The addition of molybdenum increases the precipitating temperature and leads to the formation of M-A islands in normalized steel. Molybdenum-added steel has a better high temperature mechanical properties with a yield strength of 540 MPa and a yield ration of 0. 86 when tempered at 640 ℃ and 55% yield strength can be maintained at 600 ℃.

关 键 词：低碳钢 钼 微观组织 高温力学性能 

分 类 号：TG142.31[一般工业技术—材料科学与工程]