铌微合金化对低合金高强钢模拟焊接热影响区粒状贝氏体相变及SH-CCT曲线的影响

doi:10.13251/j.issn.0254-6051.2023.09.026

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 150-156.DOI: 10.13251/j.issn.0254-6051.2023.09.026

铌微合金化对低合金高强钢模拟焊接热影响区粒状贝氏体相变及SH-CCT曲线的影响

鄢文泽^1,2, 闫文青^1,2, 林轩艺^1,2, 王红鸿^1,2

1.武汉科技大学材料与冶金学院, 湖北武汉 430081;
2.武汉科技大学省部共建耐火材料与冶金国家重点实验室, 湖北武汉 430081

收稿日期:2023-03-29 修回日期:2023-07-17 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 王红鸿,教授,博士,E-mail:wanghonghong@wust.edu.cn
作者简介:鄢文泽(1997—),男,硕士研究生,主要研究方向为金属材料的加工成形与热处理,E-mail:1054547166@qq.com。
基金资助:
国家自然科学基金面上项目(51971165)

Effect of Nb micro-alloying on granular bainite transformation and SH-CCT curves in simulated heat-affected zone of high strength low alloy steel

Yan Wenze^1,2, Yan Wenqing^1,2, Lin Xuanyi^1,2, Wang Honghong^1,2

1. College of Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan Hubei 430081, China;
2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan Hubei 430081, China

Received:2023-03-29 Revised:2023-07-17 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 设计了4种铌含量的低合金高强钢,采用Gleeble-3500热模拟机,研究铌微合金化对模拟焊接热影响区粒状贝氏体相变的影响,并通过SH-CCT(Simulated heat-affected zone continuous cooling transformation)进行表征。结果表明,添加铌元素后,连续冷却相变温度降低,中等焊接热输入的连续冷却相变温度区间约在700~500 ℃之间,发生的是贝氏体相变。随着铌含量的增加,粒状贝氏体相变的t_8/5(表征焊接热输入的参量)范围逐渐增大,当铌含量达到0.180wt%时,发生粒状贝氏体转变的t_8/5扩大到3~150 s之间,即铌含量的增加促进了连续冷却粒状贝氏体转变、且扩大了t_8/5的范围。显微硬度随着试验钢中铌含量的增加而增加,即铌含量越高,在相同的t_8/5时间下,显微硬度也越高。铌含量为0.085wt%时,在较大的热输入范围内(t_8/5=15~80 s),显微硬度变化最小。显微硬度变化范围为183~192 HV。SH-CCT曲线为铌微合金化钢基于焊接性设计提供了理论依据。

关键词: 低合金高强钢, 铌微合金化, SH-CCT曲线, 粒状贝氏体

Abstract: Four kinds of high strength low alloy steels with niobium content were designed, and the effect of niobium microalloying on the granular bainite transformation in the simulated weld heat affected zone was studied by using the Gleeble-3500 thermal simulator, which was characterized by SH-CCT (Simulated heat affected zone continuous cooling transformation). The result shows that the transformation temperature of continuous cooling transformation decreases with the addition of Nb. The continuous cooling phase transformation temperature is about 700 ℃ to 500 ℃ at the range of medium welding heat input, where the granular bainite transformation takes place. The t_8/5 range of the granular bainite transformation increases with the increase of Nb content. When the Nb content in the tested steel is increased to 0.180wt%, the range of cooling rate t_8/5 for transformation of granular bainite is around 3-150 s. The increase of Nb content promotes the continuous cooling granular bainite transformation and expands the t_8/5 range. The microhardness increases with the increase of Nb content. The higher the Nb content, the higher the microhardness at the same t_8/5condition. When the content of Nb is 0.085wt%, the change of microhardness value is the smallest in the large heat input range (t_8/5=15-80 s). The microhardness value varies from 183 HV to 192 HV. The SH-CCT curves provides a theoretical design of niobium microalloyed steel based on the weldability.

Key words: high strength low alloy steel, Nb micro-alloying, SH-CCT curves, granular bainite

中图分类号:

TG113.26⁺3

鄢文泽, 闫文青, 林轩艺, 王红鸿. 铌微合金化对低合金高强钢模拟焊接热影响区粒状贝氏体相变及SH-CCT曲线的影响[J]. 金属热处理, 2023, 48(9): 150-156.

Yan Wenze, Yan Wenqing, Lin Xuanyi, Wang Honghong. Effect of Nb micro-alloying on granular bainite transformation and SH-CCT curves in simulated heat-affected zone of high strength low alloy steel[J]. Heat Treatment of Metals, 2023, 48(9): 150-156.

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铌微合金化对低合金高强钢模拟焊接热影响区粒状贝氏体相变及SH-CCT曲线的影响

Effect of Nb micro-alloying on granular bainite transformation and SH-CCT curves in simulated heat-affected zone of high strength low alloy steel

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