316L钢焊接接头在液态铅铋合金中的空泡腐蚀研究  

Cavitation erosion behavior of 316L steel weld joint in liquid lead-bismuth eutectic alloy

作　　者：雷玉成[1] 常红霞[1] 郭晓凯[1] 

机构地区：[1]江苏大学材料科学与工程学院江苏省高端结构材料重点实验室,江苏镇江212013

出　　处：《焊接》2017年第2期7-12,60,共7页Welding & Joining

基　　金：国家自然科学基金资助项目(51375216)

摘　　要：通过使用大功率超声空化装置对固溶处理前后的焊接接头在液态铅铋合金中的空泡腐蚀行为进行了研究。使用电子扫描电镜(SEM)和原子力显微镜(AFM)对不同空化时间的焊缝的表面形貌、表面粗糙度以及表面硬度进行分析。研究发现,随着空泡腐蚀的不断进行,材料表面的粗糙度和最大腐蚀深度均在不断增加,且固溶处理前后的焊缝在空泡腐蚀前期均出现加工硬化的现象。未固溶处理的焊缝表面还出现显著的塑性变形的痕迹。固溶处理后的焊缝硬度大幅提高,塑性虽然下降,但是结果表明固溶处理后的焊缝组织的耐空蚀性能更好。A high-power ultrasonic cavitation facility was used to investigate the cavitation erosion behavior of 316 L welded joints before and after PWHT in liquid LBE at 550 ℃. After different time of cavitation erosion test,SEM and AFM were used to analyze the surface topography,roughness and hardness. It is found that the roughness and the maximum erosion depth increase with the increase of erosion time,and work hardening is found on all the surface of welded joints with and without solution treatment. Plastic deformation appears on the surface of welded joint without solution treatment,and after solution treatment,the hardness of welded joint increases greatly but the plasticity is decreased. The results and analyses showed that the welded joint with solution treatment exhibits better cavitation erosion resistance.

关 键 词：空泡腐蚀 316L不锈钢 焊接接头 铅铋合金 固溶处理 

分 类 号：TG47[金属学及工艺—焊接]