D36高强钢摩擦塞焊焊接接头组织和性能研究  

Microstructure and Mechanical Property of Friction Hydro-Pillar Processing for D36 High-Strength Steel

作　　者：徐雅晨[1,2] 荆洪阳[1,2] 韩永典[1,2] 徐连勇[1,2] Xu Yachen;Jing Hongyang;Han Yongdian;Xu Lianyong(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Advanced Joining Technology,Tianjin 300350,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350 [2]天津市现代连接技术重点实验室,天津300350

出　　处：《天津大学学报（自然科学与工程技术版）》2017年第7期676-681,共6页Journal of Tianjin University：Science and Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA090302)~~

摘　　要：利用自主研发的摩擦塞焊设备对摩擦塞焊圆柱形试样进行试验,试样材料选择D36高强钢,通过温度巡检仪采集焊接过程中温度演化数据,试验后对焊接接头进行宏观形貌、金相组织、硬度以及拉伸性能的研究.结果发现:在焊接过程中,温度先迅速升高,之后缓慢降低,塞孔底部最先升温,温度峰值出现在塞孔侧壁中间处;塞棒端部和塞孔底部带有倒角的试样可以获得无缺陷的焊接接头;焊接接头中母材组织为轧制后的铁素体和珠光体的带状组织,焊缝组织和上部热影响区组织为上贝氏体,而塞孔底部倒角处的热影响区以细小的铁素体和珠光体组织为主;焊接接头的硬度分布一般为母材最低,热影响区次之,焊缝最高;当塞棒端部和塞孔底部的倒角达到4,mm时,摩擦塞焊焊接接头拉伸试验的断裂位置在母材处,保证了焊接接头的拉伸性能.The welding quality of friction hydro-pillar processing(FHPP)using cylindrical stud-hole configurationwith different rounded corners was investigated.The material of the sample was selected D36high-strength steel.Allwelds were conducted by using self-developed high-performance welding equipment.During the welding,the thermalcycles of substrate in different positions were collected through a temperature inspection instrument.The macrograph,microstructure,hardness,and tensile property of the welding joints were investigated.The main findings areas follows:the welding temperature is rapid rise firstly and then decreasing slowly.The hole bottom is heating upinitially and the peak temperature appears at the center of the side wall of the hole.The stud tip and the hole bottomwith rounded corner can effectively avoid the welding defects.The microstructure of base metal is composed of ferriteand pearlite.The welding zone and the upper heat affect zone(HAZ)are consisted of upper bainite.The microstructureof HAZ in the rounded corner is fine ferrite and pearlite.The hardness value is highest in the welding zone andlowest in the substrate material.The tensile tests show the welding joint is failure in base material when the stud tipand hole bottom have4,mm rounded corners.This configuration can ensure the welding quality.

关 键 词：摩擦塞焊 焊接热循环 金相组织 硬度 拉伸性能 

分 类 号：TG456.9[金属学及工艺—焊接]