1Cr0.5Mo 钢焊接接头蠕变裂纹扩展速率的评定  

Evaluation of Creep Crack Growth Rate of 1 Cr05Mo Weld

作　　者：沈复中[1] 马功勋[1] 杨旭[1] 尹基奉[2,3] 信奎仁 

机构地区：[1]南京化工大学 [2]韩国中央大学 [3]金陵石化公司

出　　处：《材料工程》1998年第4期12-13,共2页Journal of Materials Engineering

摘　　要：在５３８℃温度下用ＣＴ试样对１Ｃｒ０．５Ｍｏ钢焊接接头进行蠕变裂纹扩展试验，得出焊接接头熔合线附近母材一侧的性能薄弱区ｄａ／ｄｔ＝０．０１４０５４［Ｃ＊（ｔ）］０．８８４９的规律。服役２６年的发电厂主蒸汽管道重新焊接制成的ＳＮＳ接头，其ｄａ／ｄｔ～Ｃ＊（ｔ）的数据基本上落在同类新材料的ＮＮＮ接头的数据分散带附近。由此可以证实：焊接接头一旦出现较为严重的损伤，可以采用剔除接头及其附近材料的方法进行重新组焊修复，经修复后的管道仍具相当长的继续使用寿命。The tests of creep crack growth rate of 1 Cr 05Mo weld at 538℃ temperature are done by CT specimensThe regularity,da/dt=0014054[C(t)]08849,is given in the weak region,near by fusion line on the parent material sideThe SNS weld is made from old parent materials taken from the serviced main vapour pipe which have worked at the operation condition for 26 yearsFor the da/dt versus C(t),the data of SNS weld are dropped into near by the scatter band of NNN weld which made from new materialsIt is proven that the weld once seriously damaged will be repaired by reassembing and rewelding materials lain in the weld and near to itThe renewed weld can still service at the operation condition for considerable time

关 键 词：焊接接头 蠕变 裂纹扩展 紧凑拉伸试样 合金钢 

分 类 号：TG407[金属学及工艺—焊接]