G20Mn5铸钢件MAG焊焊补接头组织与力学性能研究
Study on Microstructure and Mechanical Properties of G20Mn5 Cast Steel Joints by MAG Repair Welding
- 2024年54卷第6期 页码:66-73
纸质出版日期: 2024-06-25
DOI: 10.7512/j.issn.1001-2303.2024.06.11
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纸质出版日期: 2024-06-25 ,
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孙佳,梁炬星,马传平,等.G20Mn5铸钢件MAG焊焊补接头组织与力学性能研究[J].电焊机,2024,54(6):66-73.
SUN Jia, LIANG Juxing, MA Chuanping, et al.Study on Microstructure and Mechanical Properties of G20Mn5 Cast Steel Joints by MAG Repair Welding[J].Electric Welding Machine, 2024, 54(6): 66-73.
为研究G20Mn5铸钢件最优的焊补工艺,以提高铸钢件质量和降低生产成本。对G20Mn5铸钢件进行MAG焊焊补,比较了5种焊补工艺(包括焊前预热、焊后保温、热处理等条件)的接头显微组织和力学性能。试验结果显示,所有焊补工艺接头的焊缝区和热影响区粗晶区均未出现淬硬的马氏体组织和粗大的魏氏组织;焊补接头的抗拉强度均超过480 MPa,断后伸长率均大于20%,硬度峰值均低于250 HV,焊缝和热影响区的冲击功值均大于母材;各焊补接头的拉伸试样和疲劳试样均断裂于母材,疲劳裂纹源为铸钢件内部的显微缩松缺陷。试验证明,5种工艺焊补接头的显微组织和力学性能均满足使用要求,综合考虑各方面因素,焊补前不预热+焊补后覆盖保温缓冷+不热处理为最优焊补工艺。
To investigate the microstructure and mechanical properties of the welded joints of G20Mn5 cast steel for determining the optimal welding repair process
enhancing the quality of cast steel parts
and reducing production costs
G20Mn5 cast steel parts were welded using the MAG welding method. Five different welding repair processes (including preheating before welding
post-weld heat preservation
and heat treatment conditions) were compared for the mechanical properties of the joints. The test results showed that none of the welded joints exhibited hardened martensitic structures or coarse Widmanstätten structures in the weld zone and the coarse grain area of the heat-affected zone; the tensile strength of all welded joints exceeded 480 MPa
the elongation after fracture was greater than 20%
the peak hardness was below 250 HV
and the impact energy of the weld zone and heat-affected zone was greater than that of the base material; the tensile and fatigue samples of each welded joint all fractured in the base material
with the fatigue crack source being the micro-shrinkage porosity defect inside the cast steel part. The tests have proven that the microstructure and mechanical properties of the welded joints of the five processes meet the requirements for use. Considering all factors
the optimal welding repair process is "no preheating before welding
post-weld covering for heat preservation and slow cooling
and no heat treatment."
G20Mn5铸钢焊补热处理显微组织力学性能
G20Mn5 cast steelwelding repairheat treatmentmicrostructuremechanical properties
方孝钟,董洪达,阮小丹,等. 去应力退火对P355NL1钢焊接接头组织及性能的影响[J]. 电焊机,2021,51(7):70-75+85.
FANG X Z,DONG H D,RUAN X D,et al.Effect of stress relief annealing treatment on microstructure and properties of P355NL1 steel welded joints[J].Electric Welding Machine,2021,51(7):70-75+85.
果伟,张志毅,邱培现,等.转向架用S355J2W钢MAG焊接接头残余应力研究[J]. 电焊机, 2018, 48(3):300-303.
GUO W,ZHANG Z Y,QIU P X,et al.Research on the residual stress of S355J2W steel MAG welded joints of bogies[J]. Electric Welding Machine,2018,48(3):300-303.
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(6):9-10+20.
XIA S H,CHEN H S,CAO J F,et al.Study on mechanical properties of g20mn5 steel castings[J].Locomotive & Rolling Stock Technology,2014(6):9-10+20.
李春来,秦庆斌,吴胜川,等. 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(4):8-11+17.
LI C L,QIN Q B,WU S C,et al. Microstructure and Mechanical Properties of G20Mn5 Cast Steel MAG Welded Joint[J]. Materials For Mechanical Engineering,2020,44(4):8-11+17.
卓帅,谢耀征,单其雨,等. 铸件在轨道客车转向架上的应用及展望[J]. 机车车辆工艺,2021(2): 15-17+20.
ZHUO S,XIE Y Z,SHAN Q Y,et al.Application and prospect of castings in bogies for railway passenger wagons[J].Locomotive & Rolling Stock Technology,2021(2):15-17+20.
莫立新,杨超飞,牛继承. ZG14Ni3Cr MoV钢铸件补焊方法研究[J].材料开发与应用,2017,32(1):54-57.
MO L X,YANG C F,NIU J C.Repair-welding Study on ZG14Ni3Cr Mo V Cast Steel[J].Development and Application of Materials,2017,32(1):54-57.
杨宝林,刘晓军,王鑫. G20Mn5钢与P355NL1钢对接焊试样断口分析[J]. 焊接技术,2020,49(12):20-23.
YANG B L,LIU X J,WANG X. Fracture analysis of butt welding sample between G20Mn5 steel and P355NL1 steel[J].Welding Technology,2020,49(12):20-23.
朱刚,周友龙,张志昌,等. B+级铸钢件缺陷低温焊补工艺试验研究[J]. 机车车辆工艺,2009(1):4-6.
ZHU G,ZHOU Y L,ZHANG Z C,et al. Experimental study on low temperature welding repair process for B+grade steel castings[J]. Locomotive & Rolling Stock Technology,2009(1):4-6.
中国机械工程学会焊接学会. 焊接金相图谱[M]. 北京:机械工业出版社,1987:128.
张磊,赵勇桃,霍文霞. 冷却速率对45Mn2钢魏氏组织的影响[J]. 热加工工艺,2017,46(12):228-231.
ZHANG L,ZHAO Y T,HUO W X. Effect of Cooling Rate on Widmanstatten Microstructure of 45Mn2 Steel[J]. Hot Working Technology,2017,46(12):228-231.
束德林. 工程材料力学性能[M]. 北京:机械工业出版社,2005:24.
徐贵宝. 地铁电机悬挂梁疲劳开裂分析及改进措施[J]. 铸造,2019,68(12):1411-1416.
XU G B. Analysis and Preventive Measures of Fatigue Cracking of Suspension Beam for Metro Motor[J].Foundry,2019,68(12):1411-1416.
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