氢对347L不锈钢堆焊层的低频疲劳特性的影响  

Effect of Hydrogen on the Characteristics of Low Frequency Fatigue in the Weld Overlay Cladding of Stainless Steel 347L

作　　者：邱昆彪[1] 郭世行[2] 蔡敏[2] 徐坚 

机构地区：[1]浙江工业大学浙西分校实习厂,浙江衢州324006 [2]中国计量学院机械电子工程系,浙江杭州310034

出　　处：《机械工程材料》2000年第3期18-20,共3页Materials For Mechanical Engineering

基　　金：浙江省自然科学基金资助项目! ( 5 980 2 3 )

摘　　要：应用弹塑性断裂力学和ΔJ参数 ,研究了原始状态与热渗氢后 3 4 7L不锈钢堆焊层短裂纹的疲劳破坏特性。并用 da/d N=C(ΔJ) n 计算了裂纹扩展速度和门槛值。结果表明 ,在氢的作用下 ,3 4 7L钢堆焊层裂纹扩展的门槛值 (ΔJth) ,从 3 55× 1 0 - 6 MN/m,下降为热渗氢后的 2 52× 1 0 - 6MN/m,da/d N～ΔJ曲线也比原始状态的向左移 ,提高了裂纹扩展速度。断口分析表明 ,氢既有在柱状晶界及滑移面上位错塞积处聚集 ,促进脆化的作用 。The investingation on low frequency fatigue with short crack of the weld overlay cladding of 347L steel in original and hydrogen charged conditions indicated that the d a /dN~Δ J relation consisted of three stages relating to three equations with the model of d a /dN=C(Δ J ) n, respectively, on which the calculation of threshold value Δ J th ≈355×10 -6 MN/m for original and Δ J th ≈252×10 -6 MN/m for themal Hydrogen charged was based. The results showed that hydrogen increased obviously the propagation rate of the fatigue crack. In addition, the different crack propagation mechanism had been observed in three propagation stages after fracture analysis by SEM.

关 键 词：堆焊层 短理解纹 热渗氢 不锈钢 氢反应器 

分 类 号：TE966.04[石油与天然气工程—石油机械设备] TG455[金属学及工艺—焊接]