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王昱成, 于捷, 李彦, 李卫东, 王建光. 异种钢熔合区马氏体相变过程及组织[J]. 焊接学报, 1999, (3): 147-152.
引用本文: 王昱成, 于捷, 李彦, 李卫东, 王建光. 异种钢熔合区马氏体相变过程及组织[J]. 焊接学报, 1999, (3): 147-152.
Wang Yucheng, Yu Jie, Li Yan, Li Weidong, Wang Jianguang. Martensitic Transformation and Microstructure in Fusion Zone of Dissimilar Steel Welded Joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 1999, (3): 147-152.
Citation: Wang Yucheng, Yu Jie, Li Yan, Li Weidong, Wang Jianguang. Martensitic Transformation and Microstructure in Fusion Zone of Dissimilar Steel Welded Joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 1999, (3): 147-152.

异种钢熔合区马氏体相变过程及组织

Martensitic Transformation and Microstructure in Fusion Zone of Dissimilar Steel Welded Joint

  • 摘要: 高温金相显微镜观察发现,珠光体钢(ZG20SiMn)与奥氏体焊材(A307、A457)熔合区确实存在马氏体相变,且在约400℃至室温均有相变产生。经透射电镜观察,熔合区马氏体为低碳板条马氏体,亚结构主要是位错,有少量孪晶亚结构。熔合区碳化物主要产生于焊后热处理过程中,其类型主要为M23C6,也有部分M7C3。碳化物主要在马氏体上以及马氏体或铁素体和奥氏体界面析出。马氏体带、碳化物带宽度主要受Ni含量的控制,提高Ni含量使它们变窄,熔合区韧性提高。

     

    Abstract: The observation with elevated temperature microscope indicated that the martensite transformation really exists in the fusion zone of pearlitic base metal (ZG20SiMn) and austenitic welding consumables (A307、A457), and the transformation could occur from 400℃ to near room temperature. TEM analysis showed that martensite in the fusion zone is band type with low carbon, and its substructures are dislocation and a little twinning. The carbides in the fusion zone are mainly resulted from PWHT, typically M23C6 and some M7C3 precipitated on the martensite and bandaries between austenite and martensite. The results showed that the martensite and carbides region is mainly controlled by the Ni content of welding consumables. The increasing of Ni content makes the region narrow and gets higher charpy toughness in fusion zone.

     

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