热输入对<strong>Q500qE</strong>钢模拟<strong>CGHAZ</strong>微观组织和冲击韧性的影响

doi:10.11900/0412.1961.2021.00175

金属学报

2022, Vol. 58

Issue (12): 1581-1588 DOI: 10.11900/0412.1961.2021.00175

研究论文

本期目录 | 过刊浏览

热输入对Q500qE钢模拟CGHAZ微观组织和冲击韧性的影响

朱东明¹, 何江里²^,³, 史根豪²^,³, 王青峰²^,³(

)

^1.中铁九桥工程有限公司九江 332004
^2.燕山大学材料科学与工程学院秦皇岛 066004
^3.燕山大学亚稳材料制备技术与科学国家重点实验室秦皇岛 066004

Effect of Welding Heat Input on Microstructure and Impact Toughness of the Simulated CGHAZ in Q500qE Steel

ZHU Dongming¹, HE Jiangli²^,³, SHI Genhao²^,³, WANG Qingfeng²^,³(

)

^1.China Railway Jiujiang Bridge Engineering Co., Ltd., Jiujiang 332004, China
^2.College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China
^3.State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

引用本文:

朱东明, 何江里, 史根豪, 王青峰. 热输入对Q500qE钢模拟CGHAZ微观组织和冲击韧性的影响[J]. 金属学报, 2022, 58(12): 1581-1588.
Dongming ZHU, Jiangli HE, Genhao SHI, Qingfeng WANG. Effect of Welding Heat Input on Microstructure and Impact Toughness of the Simulated CGHAZ in Q500qE Steel[J]. Acta Metall Sin, 2022, 58(12): 1581-1588.

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摘要:

采用Gleeble-3500热模拟试验机模拟了Q500qE钢在不同热输入(E_j = 15~30 kJ/cm)下的焊接热循环过程，结合OM、SEM以及EBSD等手段探讨了热输入对粗晶热影响区(CGHAZ)微观组织和冲击韧性的影响规律及其作用机理。结果表明，随着焊接热输入的降低，板条贝氏体(LB)增多，粒状贝氏体(GB)减少，相变温度A_r3降低，贝氏体块(packet)和贝氏体束(block)明显细化；CGHAZ的冲击功KV₂ (-40℃)随着热输入的降低而提高，冲击断口均表现出明显的解理断裂特征，其解理面尺寸D_f随着热输入的降低而减小；贝氏体packet是Q500qE钢中控制CGHAZ冲击韧性最有效的结构单元。

关键词 ： Q500qE钢, CGHAZ, 焊接热模拟, 冲击韧性, 贝氏体

Abstract：

As China's economy enters a stage of high-quality development, it is important to study high-performance bridge steels with high strength, high toughness, high efficiency, and easy welding. Presently, coarse-grained heat-affected zones (CGHAZs) of high-performance bridge steels are prone to coarse-grain embrittlement, which reduces its impact toughness. To improve their low-temperature toughness, the relationship between their microstructure and impact toughness has been extensively researched and discussed. However, the control connection and internal mechanism between the bainite microstructure and impact toughness have not been clarified. In this study, the simulated samples of CGHAZs in Q500qE steel with varying heat inputs, from 15 to 30 kJ/cm, were reproduced in Gleeble 3500 thermal simulation-testing machine. The effect of different heat inputs on the microstructure, impact toughness of CGHAZs, and their inherent mechanism was discussed and analyzed in-depth using OM, SEM, and EBSD. The results indicate that the microstructure of each simulated sample of CGHAZs in Q500qE steel was composed of lath-like bainite (LB) and granular-like bainite (GB). The LB increased, the GB reduced, phase-transition temperature (A_r3) declined, and the bainitic packet/block substructure refined as the welding heat input decreased. In addition, with the decreased heat inputs, the Charpy impact energy (KV₂) at -40^oC of CGHAZs is enhanced because of the refined microstructure. The impact fracture of all samples showed cleavage fracture characteristics, and the cleavage face size of the simulated samples of CGHAZs decreased due to the reduced heat inputs. Compared with prior austenite grain boundary and bainite block, the bainite packet is the most effective microstructural unit for controlling the impact toughness of CGHAZs in Q500qE steel, and its boundary effectively facilitates the prevention of further propagation of a secondary crack.

Key words： Q500qE steel CGHAZ welding thermal simulation impact toughness bainite

收稿日期: 2021-04-26

ZTFLH:

TG401

基金资助:国家自然科学基金项目(51671165)

作者简介: 朱东明，男，1977年生，正高级工程师

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00175 或 https://www.ams.org.cn/CN/Y2022/V58/I12/1581

图1 Q500qE钢板的原始组织

图2 不同热输入下粗晶热影响区(CGHAZ)的焊接热循环曲线

图3 不同热输入下CGHAZ显微组织的OM像

图4 不同热输入下CGHAZ的典型SEM像

表1 不同热输入下CGHAZ的微结构尺寸测量结果和解理面尺寸统计

图5 不同热输入下CGHAZ的EBSD像

图6 不同热输入下CGHAZ的Charpy冲击功

图7 不同热输入下CGHAZ的冲击断口形貌

图8 典型热输入下CGHAZ的二次裂纹形貌

图9 不同热输入下CGHAZ的热膨胀曲线以及对应的奥氏体向铁素体转变开始温度

图10 解理面尺寸与PAG尺寸、贝氏体packet尺寸和block宽度的拟合关系

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