EH36钢埋弧焊焊缝金属组织临界断裂韧性

刘畅; 邓彩艳; 王胜; 龚宝明

doi:10.12073/j.hjxb.2019400081

EH36钢埋弧焊焊缝金属组织临界断裂韧性

刘畅¹,
邓彩艳^1,2,
王胜³,
龚宝明^1,2,*,

1. 天津大学材料科学与工程学院，天津　300072;
2. 天津市现代连接技术重点实验室，天津　300072;
3. 深圳赤湾胜宝旺工程有限公司，深圳　518068

基金项目:

国家自然科学基金资助项目(51305295)；教育部博士点基金项目(20130032120006)

详细信息

作者简介:
刘　畅，男，1994年出生，硕士研究生. 主要从事焊接结构完整性方面的研究. Email: 530505593@qq.com

通讯作者:
龚宝明，男，博士，讲师. Email: gongbm@tju.edu.cn

中图分类号: TG 407
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出版历程
- 收稿日期: 2017-12-21

Critical fracture toughness of weld metal structure in submerged arc welding of EH36 steel

1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China;
3. Chiwan Sembawang Engineering Co., Ltd., Shenzhen 518068, China

摘要

摘要: 通过对典型海洋结构用钢EH36埋弧焊焊缝金属进行单边缺口拉伸试验(single edge notched tensile，SENT)研究焊缝金属中针状铁素体(acicular ferrite，AF)和先共析铁素体(proeutectoid ferrite，PF)的临界断裂韧性. 结果表明，AF的断裂韧性要高于PF，主要原因在于AF内部具有较高密度的位错及位错能，在外力作用下，裂纹尖端极易发生塑性变形而钝化；相反，PF组织较纯且均匀，位错密度较小，裂纹尖端并未发生钝化. 这种组织的不均匀性导致了焊缝金属断裂韧性较大的分散性，主要归结于试样预制裂纹尖端位置的微观组织性能.
- 焊缝金属 /
- 针状铁素体 /
- 先共析铁素体 /
- 断裂韧性
Abstract: SENT (Single Notched Tensile) specimen was used to study the critical fracture toughness of acicular ferrite (AF) and proeutectoid ferrite (PF) in the EH36 submerged arc welding weld metal. The results showed that the fracture toughness of AF is higher than that of PF. The main reason is that the AF has a high density of dislocation, crack blunting occurs due to plastic deformation under loading. In contrast, PF, whose dislocation density is small, is relatively pure and uniform. The heterogeneity of microstructures lead to a great dispersion of the fracture toughness of the weld metal, which is mainly due to the different fracture toughness and heterogeneous distribution of microstructures in crack tip.
- weld metal /
- acicular ferrite /
- proeutectoid ferrite /
- fracture toughness

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参考文献(11)

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