热输入对Q460钢焊接接头组织及拉伸变形行为的影响

doi:10.12068/j.issn.1005-3026.2018.04.012

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (4): 511-515.DOI: 10.12068/j.issn.1005-3026.2018.04.012

热输入对Q460钢焊接接头组织及拉伸变形行为的影响

冯祥利^{1, 2}，王磊¹，刘杨¹

(1. 东北大学材料各向异性与织构教育部重点实验室，辽宁沈阳110819; 2. 中冶置业集团有限公司，北京100088)

收稿日期:2017-10-08 修回日期:2017-10-08 出版日期:2018-04-15 发布日期:2018-04-10
通讯作者: 冯祥利
作者简介:冯祥利(1972-)，男，河北唐山人，东北大学博士研究生; 王磊(1961-)，男，河北唐山人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金资助项目(51171041).国家自然科学基金资助项目(51571052， 51371044)；辽宁省自然科学基金资助项目(2014020034).

Effect of Heat Input on Microstructure and Tensile Deformation Behavior of Q460 Steel Weld Joint

FENG Xiang-li^{1, 2}， WANG Lei¹， LIU Yang¹

1. Key Laboratory for Anisotropy and Texture of Materials

Received:2017-10-08 Revised:2017-10-08 Online:2018-04-15 Published:2018-04-10
Contact: WANG Lei
About author:-
Supported by:
-

摘要/Abstract

摘要： 以Q460钢为对象，研究了埋弧焊热输入对其接头组织及其拉伸变形行为的作用规律与机理.结果表明:接头HAZ宽度随热输入增加而增大，同时FZ柱状晶比例也增加，FZ靠近熔合线的组织明显细化，且FZ的软化得到改善.热输入对接头整体强度无明显影响，而断裂延伸率呈增加趋势.19.0kJ/cm下焊接接头FZ与HAZ界面的变形不协调，导致过早发生断裂.随热输入的增加，FZ组织细化，缓解了FZ与HAZ界面硬度差，提高了接头的塑性变形能力，拉伸断裂位置由FZ转移至BM.

关键词: Q460钢, 焊接, 热输入, 显微组织, 变形行为

Abstract: The effect of heat input by submerged arc welding on microstructure and tensile deformation behavior of weld joint in Q460 steel was studied and its mechanism was also discussed. The results showed that with the increase of the heat input， the width of the heat affected zone (HAZ) of the welding joint and the proportion of columnar zone in the fusion zone (FZ) increase， meanwhile the microstructure becomes finer near the weld zone and the welding softening in the FZ is improved. It is also found that the heat input has little effect on the tensile strength of the welding joint， while the fracture elongation of the joint increases with increasing heat input. When the heat input is 19.0kJ/cm， the fracture of the joint occurs very easily due to the mismatch of plastic deformation at the joint interface between the FZ and HAZ. With increasing heat input， the microstructure in the FZ becomes finer and the hardness difference at the interface between the FZ and HAZ can be reduced. Therefore， the plasticity of the overall joint can be improved and the fracture of the joints is located from the FZ to BM.

Key words: Q460 steel, welding, heat input, microstructure, deformation behavior

中图分类号:

TG457.11

冯祥利，王磊，刘杨. 热输入对Q460钢焊接接头组织及拉伸变形行为的影响[J]. 东北大学学报:自然科学版, 2018, 39(4): 511-515.

FENG Xiang-li ， WANG Lei， LIU Yang. Effect of Heat Input on Microstructure and Tensile Deformation Behavior of Q460 Steel Weld Joint[J]. Journal of Northeastern University Natural Science, 2018, 39(4): 511-515.

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热输入对Q460钢焊接接头组织及拉伸变形行为的影响

Effect of Heat Input on Microstructure and Tensile Deformation Behavior of Q460 Steel Weld Joint

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