低碳粒状贝氏体钢强韧化机理的探讨  

Study on the mechanism of strengthening and toughening of low carbon bainitic Steel

作　　者：赵捷[1] 王志奇[1] 李建平[2] 

机构地区：[1]天津理工学院材料科学工程系,天津300191 [2]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110006

出　　处：《天津理工学院学报》2000年第1期11-15,共5页Journal of Tianjin Institute of Technology

摘　　要：对 1 4SiMn3Mo低碳贝氏体钢的强韧性及组织作了研究 .结果表明 :该钢连续空冷后 ,组织为粒状贝氏体 ,韧性差、屈强比低 .经 30 0℃回火可获得良好的强韧性配合 ,而经40 0 - 50 0℃回火产生回火脆性 .根据回火过程中显微组织及残余奥氏体稳定性等方面的变化 。The microstructure, strength and toughness of 14SiMn3Mo low-carbon bainitic steelhave been studied. The results show that the structure of the steel after air cooling is granular bainite. It exhibits poor toughness and low ratio of yield to tensile strength. The optimum combination of strength and toughness can be obtained for the steel tempered at 300℃. Temper embrittlement evidently occurs in the range of 400～500℃. According to the changes of microstructure and stability of retained austenite,the mechanism of strengthening toughening and temper embrittlement of low carbon bainitic steel is discussed.

关 键 词：粒状贝氏体 强韧化 回火 组织 低碳贝氏体钢 

分 类 号：TG142.2[一般工业技术—材料科学与工程] TG161.5[金属学及工艺—金属材料]