保护气体对06Cr19Ni10钢焊接接头疲劳性能的影响
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摘要
O_2与CO_2作为MAG焊常用的活性气体,其加入量对奥氏体不锈钢接头的疲劳性能有着一定的影响。通过脉动拉伸疲劳试验和金相组织分析,研究06Cr19Ni10钢MAG焊对接接头在两种不同保护气氛下的疲劳性能。结果表明:当保护气体为φ(Ar)95%+φ(CO_2)5%时,中值疲劳强度为300 MPa;当保护气体为φ(Ar)97%+φ(O_2)3%时,中值疲劳强度为302.5 MPa。二者疲劳性能良好且相近。试件断裂位置主要集中在热影响区,启裂区有明显启裂源;扩展区的疲劳纹清晰;终断区为韧窝型韧性断口;两种接头焊缝组织基体均为奥氏体,基体上分布δ铁素体。
The oxygen and carbon dioxide are available active gas and both are commonly applied in MAG welding,the amount of their addition has definite influence on the fatigue performance of austenitic stainless steel. Through pulsating tensile fatigue test and metallographic structure analysis,the fatigue performance of MAG welding butt joint of 06Cr19Ni10 steel with two different kinds of protective atmospheres is studied. The results show that the median fatigue strength of φ(Ar)95% +φ(CO_2)5% is 300 MPa,the median fatigue strength of φ(Ar)97%+φ(O_2)3% is 302.5 MPa. The fracture location of specimen mainly concentrates in the heat affected zone. The crack starter location is obvious in the crack initiation zone;the fatigue striations on the extending zone are clear;the final broken zone is the toughness dimple type of fracture;the matrixes of the microstructures of two types of welded joints are both austenitic,and there are δ ferrites distribute on the matrix.
The oxygen and carbon dioxide are available active gas and both are commonly applied in MAG welding,the amount of their addition has definite influence on the fatigue performance of austenitic stainless steel. Through pulsating tensile fatigue test and metallographic structure analysis,the fatigue performance of MAG welding butt joint of 06Cr19Ni10 steel with two different kinds of protective atmospheres is studied. The results show that the median fatigue strength of φ(Ar)95% +φ(CO_2)5% is 300 MPa,the median fatigue strength of φ(Ar)97%+φ(O_2)3% is 302.5 MPa. The fracture location of specimen mainly concentrates in the heat affected zone. The crack starter location is obvious in the crack initiation zone;the fatigue striations on the extending zone are clear;the final broken zone is the toughness dimple type of fracture;the matrixes of the microstructures of two types of welded joints are both austenitic,and there are δ ferrites distribute on the matrix.
引文
[1]姚明哲.不锈钢轨道车辆的特点[J].装备机械,2015(3):10-13.
[2]魏小华.保护气氛对06Cr19Ni10钢焊接接头组织和力学性能的影响[J].电焊机,2015,45(10):151-153.
[3]钮旭晶,许鸿吉,刘春宁,等.一、二次补焊时高速列车用铝合金焊接接头疲劳性能的影响[J].电焊机,2011,41(11):44-46
[4]孙咸.不锈钢焊缝金属的组织演变及其影响[J].机械制造文摘—焊接分册,2012(6):6-10.
[5]高中稳,刘磊,李明娜,等.304不锈钢高温焊接残余应力研究[J].石油化工设备,2015,44(5):25-29.
[6]刘庆东.国产304钢及其焊接结构的疲劳性能研究[D].辽宁:东北大学,2009.
[2]魏小华.保护气氛对06Cr19Ni10钢焊接接头组织和力学性能的影响[J].电焊机,2015,45(10):151-153.
[3]钮旭晶,许鸿吉,刘春宁,等.一、二次补焊时高速列车用铝合金焊接接头疲劳性能的影响[J].电焊机,2011,41(11):44-46
[4]孙咸.不锈钢焊缝金属的组织演变及其影响[J].机械制造文摘—焊接分册,2012(6):6-10.
[5]高中稳,刘磊,李明娜,等.304不锈钢高温焊接残余应力研究[J].石油化工设备,2015,44(5):25-29.
[6]刘庆东.国产304钢及其焊接结构的疲劳性能研究[D].辽宁:东北大学,2009.