不锈钢焊接接头疲劳强度试验研究  

EXPERIMENTAL INVESTIGATION ON THE FATIGUE RESISTANCE OF STAINLESS STEEL WELDED JOINTS

作　　者：吴冰[1] 杨新岐[1] 贾法勇[1] 霍立兴[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《机械强度》2004年第3期321-325,共5页Journal of Mechanical Strength

基　　金：国家博士基金资助项目 (1 9990 0 560 5)~~

摘　　要：通过焊接接头疲劳试验对SAF2 2 0 5双相不锈钢和 1Cr18Ni9Ti奥氏体不锈钢焊接接头S—N曲线进行详细分析 ,并与 16Mn钢焊接接头的试验结果进行比较 ,讨论不同材料焊接接头及试样接头型式对S—N曲线的影响。试验结果表明 ,SAF2 2 0 5钢和 1Cr18Ni9Ti钢焊接试样的常数m和N =2× 10 6疲劳强度与国际焊接学会 (IIW )推荐的数值有较大差异 ,采用IIW的S—N曲线对本文不锈钢焊接试样疲劳评定时 ,将给出偏于安全的结果 ;接头型式不同导致焊接接头局部应力集中有较大差异 ,因而对采用名义应力表示的S—N曲线有明显影响 ;在同类接头形式下 ,SAF2 2 0 5钢和1Cr18Ni9Ti钢焊接接头的焊态疲劳强度高于 16Mn钢焊接接头 。S—N curves of welded joints made by SAF2205 two-phase stainless steel and 1Cr18Ni9Ti austenite stainless steel are studied based on the results of fatigue tests. The influence of the different material for welded joint and the joint geometry on S—N curve is discussed by comparison with the test result of welded joints of 16Mn steel. It indicates that the constant m and the fatigue resistance value which is at 2×10 6 cycles are different from the value recommended by IIW obviously. The fatigue assessment result of stainless steel welded joints which is given by IIW S—N curve is conservative. In addition, the different joint geometies lead to the difference of local stress concentration of welded joints, so nominal stress S—N curve is affected evidently by that; for the same joint geomety, the fatigue resistance of SAF2205 steel and 1Cr18Ni9Ti steel welded joints is higher than that of 16Mn steel welded joints, and moreover, that of two-phase stainless steel welded joints is the highest.

关 键 词：双相不锈钢 奥氏体不锈钢 疲劳强度 接头型式 

分 类 号：TG405[金属学及工艺—焊接]