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| 中国低活马氏体钢熔化焊接头硬度与微观组织 |
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雷玉成1, 顾康家1, 朱强1, 陈希章1, 巨新2, 常凤华3
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1.江苏大学材料科学与工程学院, 江苏镇江 212013;2.北京科技大学物理系, 北京 100083;3.哈尔滨焊接技术培训中心, 哈尔滨 150046
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| 摘要: |
| 针对4 mm厚的中国低活马氏体钢,采用TIG焊接方法分别对预热和未预热两组试样进行了焊接和焊后回火处理,对焊接接头的硬度和微观组织结构进行了测试和观察.结果表明,焊缝区硬度值偏高,靠近母材的热影响区出现较窄的软化带;焊接接头金相组织为板条特征明显的回火马氏体组织,未预热试样的马氏体含量与预热试样相比较,两者之间没有明显的差异.在晶内和晶界处分布大量的碳化物,焊缝区为尺寸较小的棒状,母材和热影响区为尺寸较大的颗粒状,接头的组织和碳化物的析出对焊接接头的硬度有很大的影响. |
| 关键词: 中国低活马氏体钢 硬度 马氏体 碳化物 |
| DOI： |
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| 基金项目:国家973计划基金资助项目(2008CB717802);江苏大学科技创新团队资助项目(JD000019) |
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| Hardness and microstructure of China low activation martensitic steel fusion welded joint |
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LEI Yucheng1, GU Kangjia1, ZHU Qiang1, CHEN Xizhang1, JU Xin2, CHANG Fenghua3
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1.School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;2.Physics Department, University of Science and Technology of Beijing, Beijing 100083, China;3.Harbin Welding Training Institute, Harbin 150046, China
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| Abstract: |
| The preheated and non-preheated 4 mm China low activation martensitic steel(CLAM) plate were welded by TIG welding and post-weld heat treating, and the hardness and microstructure in welded joint were tested and observed.The results show that the hardness in the weld metal is higher and the softening band appears in the heat-affected zone(HAZ) closing to the base metal.The tempered lath martensite is observed in welded joints.There is no significant difference in martensite content between the preheated and non preheated weldments.A large amount of carbide particles are observed in the grains and at the grain boundary.The carbides are small rods in weld metal and large granular in the HAZ and base metal respectively.The microstructure and carbides in welded joints have great effect on the hardness. |
| Key words: China low activation martensitic steel hardness martensite carbide |
