Microstructure and Mechanical Properties of G20Mn5 Cast Steel MAG Welded Joint
摘 要
采用单面两道焊方式对8 mm厚G20Mn5铸钢板进行熔化极活性气体保护电弧(MAG)对接焊,研究了接头的显微组织、硬度、拉伸性能、疲劳性能。结果表明:接头表面成形良好,无明显的焊接缺陷;接头由母材、热影响区、焊缝组成,其中热影响区可分为不完全正火区、正火区和过热区;由母材到焊缝中心,接头硬度整体呈先升高后降低的趋势,熔合处的硬度最高,达到70 HRB左右,焊缝的硬度为55~60 HRB,略高于母材的;接头的抗拉强度明显高于母材的,而断后伸长率低于母材的;接头的高周疲劳强度与母材的相当,且断裂位置均位于热影响区。该接头的性能满足设计要求。
Abstract
G20Mn5 cast steel plates with thickness of 8 mm were connected by metal active gas (MAG) arc butt welding with one-side two-pass welding method. The microstructure, hardness, tensile property and fatigue property of the joint were studied. The results show that the joint had the good surface and no obvious welding defects were found. The joint consisted of base metal, heat affected zone and weld zone, and the heat affected zone was subdivided into incomplete normalized zone, normalized zone and overheated zone. From the base metal to the weld center, the hardness of the joint increased first and then decreased. The fusion zone had the highest hardness of about 70 HRB, and the hardness of the weld was 55-60 HRB, which was a little higher than that of the base metal. The tensile strength of the joint was obviously higher than that of the base metal, while the percentage elongation after fracture was lower than that of the base metal. The high cycle fatigue strength of the joint was equivalent to that of the base metal, and both fractured at heat affected zone. The properties of the joint met the design requirements.
中图分类号 U270.12 TG405 DOI 10.11973/jxgccl202007002
所属栏目 试验研究
基金项目 国家自然科学基金资助项目(11572267);中国铁路总公司系统性重大项目(P2018J003)
收稿日期 2019/2/19
修改稿日期 2020/1/7
网络出版日期
作者单位点击查看
备注李春来(1981-),男,河北唐山人,高级工程师,硕士
引用该论文: LI Chunlai,QIN Qingbin,WU Shengchuan,ZHANG Xiaojun,LIANG Tao,LIU Yang. Microstructure and Mechanical Properties of G20Mn5 Cast Steel MAG Welded Joint[J]. Materials for mechancial engineering, 2020, 44(7): 8~11
李春来,秦庆斌,吴圣川,张晓军,梁涛,刘洋. G20Mn5铸钢MAG焊接接头的组织与力学性能[J]. 机械工程材料, 2020, 44(7): 8~11
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参考文献
【1】WU S C,HU Y N,DUAN H,et al.On the fatigue performance of laser hybrid welded high Zn 7000 alloys for next generation railway components[J].International Journal of Fatigue,2016,91:1-10.
【2】梁红琴,蔡慧,赵永翔,等.高速客车转向架构架焊接接头疲劳可靠性分析[J].机械科学与技术,2015,34(6):925-929.
【3】路浩,邢立伟,陈大军.高速列车用耐候钢活性MAG焊接技术[J].焊接学报,2013,34(11):105-108.
【4】GAO Y H,ZHAO W Z,WANG Y D, et al. Lightweight design with weld fatigue constraints for a three-axle bogie frame using sequential approximation optimisation method[J]. International Journal of Vehicle Design, 2017,73(1/2/3):3.
【5】王萌.地铁转向架构架疲劳评价与载荷谱试验研究[D].北京:北京交通大学,2011.
【6】杜子学,杨百岭.某型地铁转向架构架的结构优化[J].城市轨道交通研究,2014,17(8):45-48.
【7】王湘涛.DUEWAG地铁转向架构架的用材分析[J].电气牵引,2001(2):17-19.
【8】夏少华,陈红圣,曹健峰,等.G20Mn5铸钢件力学性能研究[J].机车车辆工艺,2014(2):9-10.
【9】LI Y H,QIN Q,WANG Y D,et al.Welded joint fatigue reliability analysis on bogie frame of high-speed electric multiple unit[J].Journal of Shanghai Jiaotong University (Science), 2017,22(3):365-370.
【10】段浩.铁道车辆转向架构架疲劳寿命及损伤容限评价[D].成都:西南交通大学,2018.
【11】周张义,王雨舟,杨欣.基于不同应力法的焊接构架纵向角接头疲劳累积损伤评估[J].焊接学报,2018,39(8):18-22.
【12】HOBBACHER A F. Fatigue Resistance[M]//Recommendations for fatigue design of welded Joints and components. Cham: Springer International Publishing, 2015: 37-89.
【2】梁红琴,蔡慧,赵永翔,等.高速客车转向架构架焊接接头疲劳可靠性分析[J].机械科学与技术,2015,34(6):925-929.
【3】路浩,邢立伟,陈大军.高速列车用耐候钢活性MAG焊接技术[J].焊接学报,2013,34(11):105-108.
【4】GAO Y H,ZHAO W Z,WANG Y D, et al. Lightweight design with weld fatigue constraints for a three-axle bogie frame using sequential approximation optimisation method[J]. International Journal of Vehicle Design, 2017,73(1/2/3):3.
【5】王萌.地铁转向架构架疲劳评价与载荷谱试验研究[D].北京:北京交通大学,2011.
【6】杜子学,杨百岭.某型地铁转向架构架的结构优化[J].城市轨道交通研究,2014,17(8):45-48.
【7】王湘涛.DUEWAG地铁转向架构架的用材分析[J].电气牵引,2001(2):17-19.
【8】夏少华,陈红圣,曹健峰,等.G20Mn5铸钢件力学性能研究[J].机车车辆工艺,2014(2):9-10.
【9】LI Y H,QIN Q,WANG Y D,et al.Welded joint fatigue reliability analysis on bogie frame of high-speed electric multiple unit[J].Journal of Shanghai Jiaotong University (Science), 2017,22(3):365-370.
【10】段浩.铁道车辆转向架构架疲劳寿命及损伤容限评价[D].成都:西南交通大学,2018.
【11】周张义,王雨舟,杨欣.基于不同应力法的焊接构架纵向角接头疲劳累积损伤评估[J].焊接学报,2018,39(8):18-22.
【12】HOBBACHER A F. Fatigue Resistance[M]//Recommendations for fatigue design of welded Joints and components. Cham: Springer International Publishing, 2015: 37-89.
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