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张英乔, 张汉谦, 刘伟明. M-A组元对石油储罐用钢粗晶热影响区韧性的影响[J]. 焊接学报, 2009, (1): 109-112.
引用本文: 张英乔, 张汉谦, 刘伟明. M-A组元对石油储罐用钢粗晶热影响区韧性的影响[J]. 焊接学报, 2009, (1): 109-112.
shu
ZHANG Yingqiao, ZHANG Hanqian, LIU Weiming. Effects of M-A constituent on toughness of coarse grain heat-affected zone in HSLA steels for oil tanks[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (1): 109-112.
Citation: ZHANG Yingqiao, ZHANG Hanqian, LIU Weiming. Effects of M-A constituent on toughness of coarse grain heat-affected zone in HSLA steels for oil tanks[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (1): 109-112.
shu

M-A组元对石油储罐用钢粗晶热影响区韧性的影响

Effects of M-A constituent on toughness of coarse grain heat-affected zone in HSLA steels for oil tanks

    摘要
  • 摘要: 利用Gleeble-3800热模拟试验机模拟粗晶热影响区(CGHAZ)焊接热循环,研究了大热输入条件下不同石油储罐用钢的粗晶区组织、韧性及其变化规律.结果表明,各钢粗晶区组织均以贝氏体为主,但由于铁素体、粒状贝氏体等组织的比例差异,韧性差别较大.同时,随着M-A组元面积分数的增加,韧性也呈下降趋势,两者均为先降之后维持较低值.另外,M-A组元的形态等也对韧性有影响,块状M-A组元对韧性的损害大于条状M-A组元.考虑多种合金元素共同作用对M-A组元形成的综合影响,利用多元线性回归的方法对M-A组元面积分数做出了预测,对粗晶区韧性评判有一定实际意义。

     

    Abstract: Microstructure and impact toughness of CGHAZ in HSLA steels for oil tanks under high heat input (100 kJ/cm) have been investigated. Bainite is main microstructure in CGHAZ for four steels, but there is a significant difference in impact values due to different proportion of ferrite and granular bainite. Toughness values decrease with the increase of area percentage content of M-A constituents. The effects of morphology of M-A constituents on toughness have also been studied, and the harm of massive M-A constituent is more severe than that of long strip. Considering the influence of alloy elements on the formation of M-A constituents, area percentage contents of M-A constituents are predicted by the method of multiple linear regressions, which is helpful for evaluating the toughness of CGHAZ.

     

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