双相不锈钢焊接接头疲劳强度  

Fatigue strength of duplex stainless steel welded joint

作　　者：贾法勇[1] 霍立兴[1] 吴冰[1] 张玉凤[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊接学报》2004年第2期31-34,共4页Transactions of The China Welding Institution

基　　金：国家博士点基金资助项目(1999005605)

摘　　要：试验对SAF2205双相不锈钢纵向角接板焊接接头的疲劳强度进行了研究,用有限元计算热点应力集中系数,分别得出了名义应力和热点应力疲劳S-N曲线;用国际焊接学会推荐的方法进行统计处理,并和相同接头形式结构钢的疲劳强度进行了比较。试验表明,双相不锈钢纵向角接板焊接接头名义应力疲劳强度试验结果为FAT136,热点应力疲劳强度试验结果为FAT163,高于相同接头形式结构钢的疲劳级别;双相不锈钢的静载强度级别对其疲劳强度设计级别没有明显的影响。In test, fatigue strength of SAF2205 duplex stainless steel welded joints with longitudinal gusset was studied, hot spot stress concentration factor was computed by the FEM and the fatigue S-N curves of nominal stress and hot spot stress were figured out. Moreover, the test data were statistical treated with the method recommended by IIW and compared with fatigue strength of structural steel with identical joint type. Results show that the test results of duplex stainless steel welded joint with longitudinal gusset obtained by nominal stainless steel welded joint and with longitudinal gusset obtained by nominal stress and hot spot stress are FAT136 and FAT163 respectively therefore, it is higher than the IIW FAT of corresponding welded joints in structural steel. But there is no obvious effect on the design FAT of duplex stainless steel from its steady load strength classes.

关 键 词：双相不锈钢 名义应力 热点应力 有限元 焊接接头 疲劳强度 

分 类 号：TG457.11[金属学及工艺—焊接] TG405