ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2013, Vol. 34 ›› Issue (5): 57-60.

• 组织和性能 • 上一篇    下一篇

焊接参数对超细晶粒钢SS400焊接接头组织和硬度的影响

陆恒昌1,冯岩2,麻永林1,邢淑清1,陈重毅1,马魁1   

  1. 1. 内蒙古科技大学材料与冶金学院,包头 014010;
    2. 包钢钢联股份有限公司无缝钢管厂,包头 014010 ;
  • 收稿日期:2013-04-03 出版日期:2013-10-01 发布日期:2022-09-22
  • 通讯作者: 邢淑清
  • 作者简介:陆恒昌(1986-),男,硕士研究生(内蒙古科技大学),低合金钢焊接工艺及焊接数值模拟研究。
  • 基金资助:
    国家“高档数控机床与基础制造装备”重大专项05 子课题资助(2009ZX04014-064-05)

Effect of Welding Parameters on Structure and Hardness of Welded Joint of Ultra-Fine-Grained Steel SS400

Lu Hengchang1 , Feng Yan2 , Ma Yonglin1 , Xing Shuqing1 , Chen Zhongyi1 , Ma Kui1   

  1. 1. School of Material and Metallurgy, Inner Mongolia University of Science & Technology, Baotou 014010;
    2. Seamless Pipe Plant, Steel Union Co Ltd, Baotou Steel, Baotou 014010;
  • Received:2013-04-03 Published:2013-10-01 Online:2022-09-22
  • Contact: Xing Shuqing

摘要: 分别采用J442(/%:≤0.12C、0.3~0.6Mn)、J506(/%:≤0.12C、≤1.6Mn)和J507(/%:≤0.12C、≤1.25Mn)焊条对7 mm SS400钢板(/%:0.18C、0.04Si、0.43Mn、0.022Al、0.002Ca)在热输入6~14 kJ/cm下进行手工电弧焊实验,并通过光学显微镜和显微硬度计观察和测试焊接接头的组织和硬度。结果表明,随焊条合金元素含量的增加,焊缝组织中针状铁素体量增加,当热输入≤10 kJ/cm时,焊接热影响区粗晶尺寸变化不大,当热输入大于10 kJ/cm时,粗晶尺寸明显增大;不同焊接工艺焊接接头的显微硬度均高于母材的显微硬度,没有接头软化现象。

关键词: 超细晶粒钢, SS400, 焊接接头, 热输入, 组织, 硬度

Abstract: The manual welding on 7 mm plate of ultra-fine-grained steel SS400 (/% : 0.18C, 0.04Si, 0.43Mn, 0.022Al, 0.002Ca) has been carried out by using J442 (/% : ≤0.12C, 0.3-0.6Mn) , J506 (/% :≤0.12C, 1.6Mn) and J507 (/% : ≤0.12C, ≤1.25Mn) welding rod with heat input 6-14 kJ/cm, and the structure and microhardness of welded joint are observed and measured by optical microscope and microhardness tester. Results show that with increasing alloy element content in welding rod, the amount of acicular ferrite in welded zone increases; as heat input ≤10 kJ/cm, the change of size of coarse grain in heat affected zone is minor, and as heat input is larger than 10 kJ/cm, the size of coarse grain in heat affected zone increases obviously ; the microhardness of welded joint with different welding process is all higher than the microhardness of base metal, there is no soften zone in welded joint.

Key words: Ultra-fine-grained Steel, SS400, Welded Joint, Heat Input, Structure, Hardness