韧脆转变低温区断裂韧度分析  

ANALYSIS ON FRACTURE TOUGHNESS AT LOWER TEMPERATURE REGION OF THE DUCTILE-BRITTLE TRANSITION

作　　者：李广[1,2] 曹睿[1,2] 陈剑虹[1,2] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050 [2]兰州理工大学有色金属合金及加工教育部重点实验室,兰州730050

出　　处：《机械强度》2010年第3期442-445,共4页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(50671047)~~

摘　　要：为了分析韧脆转变低温区的延伸区宽度变化及韧性陡升的原因,对C-Mn钢预裂纹试样在不同温度下进行三点弯曲裂纹尖端张开位移试验,并用SEM(scanning electron microscopy)对所有的断口进行仔细观察。结果发现在韧脆转变温度区SZW(stretch zone width)存在一临界值;韧脆转变低温区韧性陡升与SZW有关;韧脆转变低温度区COD(crack-tipopening displacement)值与SZW呈线性关系。In order to study the variable of stretch zone width(SZW) and a sharp upturn of the fracture toughness in lower temperature region of the ductile-brittle transition.The experiments of three point bending(3PB) crack-tip opening displacement(COD) for pre-cracked specimens of C-Mn steel was performed at different temperatures,then all fracture surfaces were observed carefully by SEM(scanning electron microscopy).The results show that the critical value of SZW is existed in the ductile-brittle transition region...

关 键 词：断裂韧度 延伸区宽度 韧脆转变 

分 类 号：TG115.57[金属学及工艺—物理冶金]