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复相钢CP800焊缝冷裂纹敏感性研究
引用本文:韩坤,李清山,李健,孙慧珺,张梅,徐云峰.复相钢CP800焊缝冷裂纹敏感性研究[J].上海金属,2012,34(1):34-37.
作者姓名:韩坤  李清山  李健  孙慧珺  张梅  徐云峰
作者单位:1. 上海大学材料科学与工程学院,上海,200072
2. 哈尔滨哈飞汽车工业集团有限公司,哈尔滨,150060
3. 上海大众汽车有限公司,上海,201805
摘    要:采用气体保护焊对试验钢CP800分别进行对接、斜Y、T型(角接)、CTS(搭接)焊接,测试分析不同焊接接头形式下的宏观形貌、微观组织和性能的变化,以研究CP800钢的可焊性和冷裂纹敏感性。实验结果表明:试验钢适用于各种焊接形式下的汽车结构件,具有很低的焊缝冷裂纹敏感性。焊接热影响区的组织为粒状铁素体、贝氏体以及少量的板条贝氏体,分布均匀,焊缝熔合良好。4种不同焊接方式下的焊缝硬度分布一致,最高硬度值为320 HV,小于350 HV。斜Y坡口对接接头处的母材、热影响区以及熔合区的冲击性能均大于23 J,其断口形貌均为韧窝形状。

关 键 词:CP800钢  可焊性  焊缝冷裂纹敏感性  冲击性能

COLD CRACKING SUSCEPTIBILITY OF WELDED JOINT OF CP800 STEEL
Han Kun , Li Qingshan , Li Jian , Sun Huijun , Zhang Mei , Xu Yunfeng.COLD CRACKING SUSCEPTIBILITY OF WELDED JOINT OF CP800 STEEL[J].Shanghai Metals,2012,34(1):34-37.
Authors:Han Kun  Li Qingshan  Li Jian  Sun Huijun  Zhang Mei  Xu Yunfeng
Affiliation:1.School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;2.Harbin Hafei Automobile Industry Group Co.,Ltd.,Harbin 150060,China;3.Shanghai Volksvagen Co.,Ltd.,Shanghai 201805,China)
Abstract:The butt joint,Y shape butt joint,tee joint and control thermal severity(CTS) of the welded joint(lap joint) were studied after the gas shielded arc welding for CP800 steel.The macroscopic morphology,microstructure and properties of different welding points were measured to study the weld ability and cold cracking susceptibility of CP800 steel.The test results showed that the steel was appropriate for various welding forms of automobile parts due to the lower weld cold cracking susceptibility.The microstructure of heat affected zone was granular ferrite,bainite and a small amount of lath bainite,which were well distributed and the fusion was good.The hardness distribution of the four different welding forms was similar and the maximum hardness value was 320 HV,lower than 350 HV.The impact toughness of base metal,heat affected zone and fusion zone of Y shape butt joint was higher than 23 J,and the fracture surface was dimple fracture under the scanning electron microscope.
Keywords:CP800 Steel  Weld Ability  Cold Crack Susceptibility of Welded Joint  Impact Toughness
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