小冲杆试验测试回火脆化对加氢反应器用钢焊缝力学性能的影响  

Effects of Temper Embrittlement on Mechanical Properties of Hydrogenation Reactor Steel Weld Determined by Small Punch Test

作　　者：张恩勇[1] 喻灿[1] 徐一飞[1] 关凯书[1] 

机构地区：[1]华东理工大学承压系统与安全教育部重点实验室,上海200237

出　　处：《机械工程材料》2014年第11期16-20,25,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金计划项目(51075148);国家"863"高技术研究资助项目(2012AA040105);国家科技攻关项目(2011BAK06B03)

摘　　要：利用小冲杆试验（SPT）研究了回火脆化对加氢反应器用2.25Cr-1Mo钢焊缝在-196~22℃范围内力学性能的影响,获得了它的韧脆转变温度,并对SPT试样断口进行了分析。结果表明：随着试验温度的降低,2.25Cr-1Mo钢焊缝的强度明显提高;回火脆化后的屈服强度和抗拉强度较脱脆处理后的明显大,表现出一定的回火强化效应;SPT试样断裂能可以较好地表征材料的低温韧脆转变特性和回火脆化,回火脆化使得材料的韧脆转变温度升高。The effects of temper embrittlement on mechanical properties of the 2.25Cr-1Mo steel weld in hydrogenation reactor in the temperature range from-196 ℃ to 22 ℃ were studied by small punch test（SPT）.The ductile-brittle transition temperature was obtained and the fractures of SPT specimens were analyzed.The results indicate that the tensile strength of the weld increased with temperature decreasing.The yield strength and tensile strength of specimens after temper embrittlement were significantly greater compared with the specimens after de-brittleness,which showed temper hardening effect.The fracture energy of SPT specimens can be used to characterize the low ductile-brittle transition and temper embrittlement.The ductile-brittle transition temperature of material increased because of temper embrittlement.

关 键 词：2.25Cr-1Mo钢焊缝 小冲杆试验 回火脆化 力学性能 

分 类 号：TG115.5[金属学及工艺—物理冶金]