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12%Cr铁素体不锈钢焊接接头组织及韧性研究
  • 期刊名称：钢铁研究学报,2010, 22(11).
  • 时间：0
  • 分类：TG457.1[金属学及工艺—焊接]
  • 作者机构：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004, [2]宝山钢铁股份有限公司研究院,上海200431
  • 相关基金：基金项目：国家自然科学基金资助项目（50734002）
  • 相关项目：超纯铁素体不锈钢微合金化机理
关键词： 铁素体不锈钢, 热输入, 热影响区, 显微组织, 冲击韧性, ferritic stainless steel , heat input , heat-affected zone , microstructure , impact toughness
中文摘要：

对四种不同成分的12％Cr铁素体不锈钢做了焊接性试验。分析焊接接头的组织，测量了焊接接头的低温冲击功。试验结果表明，随着碳含量的增加，焊接粗晶区组织由单相铁素体逐渐转变成以马氏体为主，粗晶区宽度变窄，晶粒尺寸变小。细晶区组织以马氏体为主，组织细小均匀。熔合线处和热影响区的低温冲击功相比母材均显著降低。断裂路径分析结果表明，窄的粗晶区宽度和小的晶粒尺寸使断裂路径经过更多的奥氏体焊缝区，提高了整体的冲击韧性。

英文摘要：

Weldability tests for four 12% Cr ferritic stainless steels with different chemical compositions were carried out. Microstructures of welded joints were analyzed and meanwhile corresponding impact energies at a low temperature were measured. The results show that microstructure in coarse grain heat-affected zone （CGHAZ） changed from fully ferrite to mainly martensite with an increase of carbon content. At the same time, the width of CGHAZ was narrowed and its grain size was reduced. Microstructure in fine grain zone was mainly composed of martensite, and its grain size was very small and uniform. The impact energies in fuse line （FL） and heat-affected zone were evidently lower than the values of base metals. According to the results of fracture path analysis, a narrow width of CGHAZ and a small grain size results in more austenitic weld bead zone existing in the fracture path, which finally improve the impact toughness of welded joints.

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超纯铁素体不锈钢微合金化机理
期刊论文 101 会议论文 12
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