Microstructure and Properties of 20Mn23Al Non-magnetic Steel Joint by Different Welding Processes
摘 要
采用非熔化极惰性气体钨极保护焊-熔化极气体保护焊(TIG-GMAW)、非熔化极惰性气体钨极保护焊-手工电弧焊(TIG-SMAW)和非熔化极惰性气体钨极保护焊-埋弧焊(TIG-SAW)等3种焊接方法对12 mm厚的20Mn23Al无磁钢板进行焊接,研究了不同焊接方法下焊接接头的显微组织和性能。结果表明:3种焊接方法下,接头焊缝的显微组织均由奥氏体、δ铁素体、碳化物组成,TIG-SAW接头焊缝的晶粒尺寸比其余2种焊接接头的大;TIG-SMAW接头焊缝的硬度最高,TIG-GMAW接头的次之,TIG-SAW接头的最低;TIG-GMAW接头的冲击韧性最好,TIG-SMAW接头的次之,TIG-SAW接头的最差,TIG-GMAW、TIG-SMAW接头冲击断口均呈韧性断裂特征,而TIG-SAW接头的呈韧性和准解理混合断裂特征;TIG-GMAW接头的耐腐蚀性能最好,TIG-SMAW接头的次之,TIG-SAW接头的最差。
Abstract
20Mn23Al non-magnetic steel plates with thickness of 12 mm were welded by inert gas tungsten shielded welding-gas metal arc welding (TIG-GMAW), inert gas tungsten shielded welding-shielded metal arc welding (TIG-SMAW) and inert gas tungsten shielded welding-submerged arc welding (TIG-SAW), respectively. The microstructure and properties of welded joints by different welding processes were studied. The results show that the microstructures of the weld in welded joints all consisted of austenite, δ ferrite and carbides by three welding processes. The grain size of TIG-SAW joint was larger than that of the other two welded joints. The hardness of the weld in TIG-SMAW joint was the highest, then TIG-GMAW joint, TIG-SAW joint in turn. The impact toughness of TIG-GMAW joint was the best, then TIG-SMAW joint, TIG-SAW joint in turn. The impact fracture of TIG-GMAW joint and TIG-SMAW joint had a characteristic of ductile fracture, while TIG-SAW joint had a mixed fracture characteristic of toughness and quasi-cleavage. The corrosion resistance of TIG-SMAW joint was the best, then TIG-GMAW joint, TIG-SAW joint in turn.
中图分类号 TG422.3 DOI 10.11973/jxgccl201811005
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目(51274162);西安市科技计划项目[201805037YD15CG21(16)];陕西省教育厅重点实验室科研计划项目(15JS082)
收稿日期 2017/8/10
修改稿日期 2018/8/22
网络出版日期
作者单位点击查看
备注张敏(1967-),男,陕西西安人,教授,博士
引用该论文: ZHANG Min,ZHANG Tao,WANG Ying,SHI Jie,LI Jihong. Microstructure and Properties of 20Mn23Al Non-magnetic Steel Joint by Different Welding Processes[J]. Materials for mechancial engineering, 2018, 42(11): 22~27
张敏,张涛,王莹,史杰,李继红. 不同焊接方法下20Mn23Al无磁钢焊接接头的显微组织与性能[J]. 机械工程材料, 2018, 42(11): 22~27
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【6】徐峰. 0Cr18Ni9不锈钢储能焊接头微观组织分析[J]. 热加工工艺, 2009, 38(3):114-115.
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【10】袁睿, 顾洋, 武会宾,等. 钢板成分及热处理工艺对中Cr钢耐CO2腐蚀性能的影响[J]. 焊管, 2018,41(4):13-18.
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【13】李海涛, 陈芙蓉, 胡艳华, 等. 焊接热循环峰值温度对10CrMo901钢硬度的影响[J].焊接学报,2009,30(2):75-78.
【14】李海涛,陈芙蓉,胡艳华,等.热输入对10CrMo901钢焊缝金属根焊层热循环的影响[J].焊接学报,2011,32(1):49-51.
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