张英乔,薛飞飞,丁玲芳,张汉谦

• 1:中北大学材料科学与工程学院
• 2:宝山钢铁股份有限公司技术中心

摘要(Abstract)：

采用气电立焊及热模拟试验研究了原油储罐用高强钢大热输入焊后热影响区、尤其是粗晶热影响区的组织与性能。结果表明,TMCP高强钢大热输入焊后粗晶区组织粗大,以板条贝氏体为主,距熔合线0.5 mm处冲击吸收功最低(77 J),冲击值完全高于标准要求(47 J)。Nb0.026%TMCP钢热影响区中导致冲击韧性严重下降的脆性M-A组元含量极少,这与钢中固溶的Nb含量较少有关,固溶Nb能降低γ-α转变温度,促使粒状贝氏体形成;Nb0.014%RQ+T钢降低了Nb含量,同时添加少量Ti,形成Ti、Nb复合添加,热影响区M-A组元含量很少,冲击韧性接近TMCP钢。

关键词(KeyWords)： 低合金高强钢;热影响区;大热输入;Nb

Abstract:

Keywords:

基金项目(Foundation): 山西省自然科学基金(2012011021-1)

作者(Author): 张英乔,薛飞飞,丁玲芳,张汉谦

DOI: 10.13289/j.issn.1009-6264.2015.10.012

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