低合金贝氏体高强钢模拟焊接粗晶热影响区低温疲劳韧脆转变行为及机制

doi:10.3901/JME.2024.06.271

机械工程学报 ›› 2024, Vol. 60 ›› Issue (6): 271-278.doi: 10.3901/JME.2024.06.271

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低合金贝氏体高强钢模拟焊接粗晶热影响区低温疲劳韧脆转变行为及机制

王博士^1,2, 陈楠楠^1,2, 蔡艳^1,2, 王敏^1,2

1. 上海市激光制造与材料改性重点实验室上海 200240;
2. 上海交通大学材料科学与工程学院上海 200240

收稿日期:2023-05-26 修回日期:2023-11-06 出版日期:2024-03-20 发布日期:2024-06-07
通讯作者: 王敏，女，1960年出生，博士，教授，博士研究生导师。主要研究方向为新材料焊接过程模拟及质量控制。E-mail：Wang-ellen@sjtu.edu.cn
作者简介:王博士，男，1991年出生，博士研究生。主要研究方向为低合金高强钢焊接接头的失效分析。E-mail：0180500910032@sjtu.edu.cn

Low-temperature Fatigue Ductile-to-brittle Transition Behavior and Mechanism for Simulated Coarse-grained Heat-affected Zone of a High-strength Low-alloy Bainite Steel

WANG Boshi^1,2, CHEN Nannan^1,2, CAI Yan^1,2, WANG Min^1,2

1. Shanghai Key Laboratory of Material Laser Processing and Modification, Shanghai 200240;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240

Received:2023-05-26 Revised:2023-11-06 Online:2024-03-20 Published:2024-06-07

摘要/Abstract

摘要： 低合金贝氏体高强钢接头粗晶热影响区是薄弱位置，针对粗晶热影响区中贝氏体组织的低温疲劳性能缺少系统研究。对一种低合金贝氏体高强钢模拟焊接粗晶热影响区进行组织特征分析及一系列温度(20 ℃到-60 ℃)的疲劳裂纹扩展试验。结果表明，该粗晶热影响区组织为板条贝氏体，板条块之间为条状的马氏体-奥氏体组元，且马氏体-奥氏体组元的碳含量和纳米硬度值都大于板条贝氏体基体。该粗晶热影响区疲劳韧脆转变温度为-40 ℃，在-40 ℃及以上时，疲劳裂纹扩展速率随温度的降低而降低，疲劳断裂模式是以辉纹为主的韧性断裂，裂纹扩展路径较为曲折，贝氏体板条束和马氏体-奥氏体组元会使扩展路径发生“之”字形偏折。而在-40 ℃以下时，疲劳裂纹扩展速率陡增，疲劳断裂模式是以辉纹、二次裂纹和准解理面为主的循环解理断裂，裂纹扩展路径较为平直，沿着贝氏体板条束和马氏体-奥氏体组元处出现二次裂纹。研究结果揭示了板条贝氏体组织特点及疲劳韧脆转变行为，能为低合金贝氏体高强钢焊接接头在低温疲劳环境中的应用提供数据支撑和参考。

关键词: 低合金贝氏体高强钢, 粗晶热影响区, 马氏体-奥氏体组元, 低温疲劳裂纹扩展, 疲劳韧-脆转变

Abstract: The coarse-grained heat-affected zone (CGHAZ) of welds of bainite high-strength low-alloy (HSLA) steels is a weak position. To date, few systematic studies have been reported on the low-temperature fatigue performance of the bainite microstructure in CGHAZ of bainitic steel welds. Fatigue crack growth rate (FCGR) tests and microstructure features are performed in the simulated a CGHAZ of a bainite HSLA steel at the low-temperature range (from 20 ℃ to -60 ℃). The results show that the microstructure in the CGHAZ is dominated by lath bainite embedded with film martensite-austenite (M-A) constituents. The carbon content and nano-indentation value in the M-A constituents are higher than those in the matrix of lath bainite. The fatigue ductile-to-brittle transition (FDBT) temperature is -40 ℃. Above -40 ℃, the FCGR decreases with decreasing temperature, and the fatigue fracture mode is a striation-dominated ductile mechanism. The crack propagation path is relatively tortuous, and the bainitic lath bundle and M-A constituents cause zigzag deflections of the path. While the FCGR increases rapidly below -40 ℃, and the fatigue fracture mode is cyclic cleavage mechanism, which features quasi-cleavage facet with mixture of striations secondary cracks and tearing ridges. The crack propagation path is relatively straight with secondary cracks along the bainite lath bundles and at the M-A constituents. The results reveal the microstructure characteristics and FDBT behavior of lath bainite, which could provide data support and reference for the application for broader applications welded joint of bainite steels subjected in low-temperature fatigue environments.

Key words: low-alloy high-strength bainite steel, coarse-grained heat-affected zone, martensite-austenite constituents, low-temperature fatigue crack growth, fatigue ductile-to-brittle transition

中图分类号:

TG142

王博士, 陈楠楠, 蔡艳, 王敏. 低合金贝氏体高强钢模拟焊接粗晶热影响区低温疲劳韧脆转变行为及机制[J]. 机械工程学报, 2024, 60(6): 271-278.

WANG Boshi, CHEN Nannan, CAI Yan, WANG Min. Low-temperature Fatigue Ductile-to-brittle Transition Behavior and Mechanism for Simulated Coarse-grained Heat-affected Zone of a High-strength Low-alloy Bainite Steel[J]. Journal of Mechanical Engineering, 2024, 60(6): 271-278.

参考文献

[1] 甘贵平，叶姜，樊雷. 回火处理对一种低碳贝氏体钢组织及低温韧性的影响[J]. 钢铁研究学报，2020，32(3)：258-264. GAN Guiping，YE Jiang，FAN Lei. Effect of tempering treatment on microstructure and low temperature toughness of a low carbon bainite steel[J]. Journal of Iron and Steel Research，2020，32(3)：258-264.
[2] 秦琴，干好，白珂，等. 贝氏体钢焊接性的影响因素分析[J]. 热加工工艺，2021，50(11)：9-13. QIN Qin，GAN Hao，BAI Ke，et al. Analysis of influence factors on weldability of bainitic steel[J]. Hot Working Technology，2021，50(11)：9-13.
[3] TERVO H，KAIJALAINEN A，PALLASPURO S，et al. Low-temperature toughness properties of 500MPa offshore steels and their simulated coarse-grained heat-affected zones[J]. Materials Science & Engineering A，2020，773：138719.
[4] WANG Xuelin，WANG Ziquan，DONG Lili，et al. New insights into the mechanism of cooling rate on the impact toughness of coarse grained heat affected zone from the aspect of variant selection[J]. Materials Science & Engineering A，2017，704：448-458.
[5] YANG Xiaocong，DI Xijie，LIU Xiuguo，et al. Effects of heat input on microstructure and fracture toughness of simulated coarse-grained heat affected zone for HSLA steels[J]. Materials Characterization，2019，155：109818.
[6] WAN Xiangliang，WU Kaiming，HUANG Gang，et al. Toughness improvement by Cu addition in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels[J]. Science Technology of Welding and Joining，2016，21(4)：295-302.
[7] LEE S G，KIM B，KIM W G，et al. Effect of Mo addition on crack tip opening displacement (CTOD) in heat affected zones (HAZs) of high-strength low-alloy (HSLA) steels[J]. Science Reports，2019，9：229.
[8] ZOU Xiaodong，ZHAO Dapeng，SUN Jincheng，et al. An integrated study on the evolution of inclusions in EH36 shipbuilding steel with Mg addition：From casting to welding[J]. Metallurgical and Materials Transactions B，2017，49(2)：481-489.
[9] HU Jun，DU Linxiu，WANG Jianjun，et al. Effect of welding heat input on microsturctures and toughness in simulated CGHAZ of V-N high strength steel[J]. Materials Science & Engineering A，2013，577：161-168.
[10] DILLEEP C R，SUNG D K，JOONOH M，et al. Classification of martensite-austenite constituents according to its internal morphology in high-strength low alloy steel[J]. Materials Letters，2020，278：128442.
[11] 曹志民，张贵峰，张建明，等. Q690C粒状贝氏体钢MAG焊接头中M-A组元的演变及其对热影响区冲击韧度的影响[J]. 机械工程学报，2014，50(20)：84-92. CAO Zhimin，ZHANG Guifeng，ZHANG Jianming, et al. Evolution of M-A constituents in HAZ and its effect on toughness of MAG joint of granular bainitic steel Q690C[J]. Journal of Mechanical Engineering，2014，50(20)：84-92.
[12] KUMAR S，NATH S K. Effect of heat input on impact toughness in transition temperature region of weld CGHAZ of HY 85 steel[J]. Journal of Materials Processing Technology，2016，236：216-224.
[13] JU J B，KIM W S，JANG J I. Variations in DBTT and CTOD within weld heat-affected zone of API X65 pipeline steel[J]. Materials Science & Engineering A，2012，546：258-262.
[14] KAWATA H，UMEZAWA O. Influence of microstructure constituents on ductile to brittle transition behavior in multi-phase steel sheets[J]. International Journal of Iron and Steel Research，2021，61(3)：1002-1010.
[15] LU Baotong，ZHENG Xiulin. Predicting fatigue crack growth rates and threshold at low temperatures[J]. Materials Science & Engineering A，1991，148：179-188.
[16] 吕宝桐，李涛，郑修麟，等. 16Mn钢低温疲劳裂纹扩展速率的预测[J]. 机械工程学报，1994(S1)：54-59. LÜ Baotong，LI Tao，ZHENG Xiulin, et al. Prediction of fatigue crack growth rates in 16Mn steel at low temperature[J]. Journal of Mechanical Engineering，1994(S1)：54-59.
[17] WALTERS C L，ALVARO A，MALJAARS J. The effect of low temperature on the fatigue crack growth of S460 structural steel[J]. International Journal of Fatigue，2016，82：110-118.
[18] LIAO Xiaowei，WANG Yuanqing，FENG Liuyang，et al. Investigation on fatigue crack resistance of Q370qE bridge steel at a low ambient temperature[J]. Construction and Building Materials，2020，236：117566.
[19] JUNG D H，KWON J K，WOO N S，et al. S-N fatigue and fatigue crack propagation behaviors of X80 steel at room and low temperatures[J]. Metallurgical and Materials Transactions A，2014，45(2)：654-662.
[20] TIAN Zhaohui，YIN Hongxiang，YANG Meng，et al. On the fatigue ductile-brittle transition of EA4T steel for high-speed railway axle[J]. International Journal of Fatigue，2022，162：106974.
[21] ASTM E647-15e1. Standard test method for measurement of fatigue crack growth rates[S]. West Conshohocken PA：ASTM International，2015.
[22] MA Hongcai，LIU Zhiyong，DU Cuiwei，et al. Comparative study of the SCC behavior of E690 steel and simulated HAZ microstructures in SO2-polluted marine atmosphere[J]. Materials Science & Engineering A，2016，650：93-101.
[23] MA Hongcai，CHEN Linheng，ZHAO Jinbin，et al. Effect of prior austenite grain boundaries on corrosion fatigue behaviors of E690 high strength low alloy steel in simulated marine atmosphere[J]. Materials Science & Engineering A，2020，773：138884.
[24] LEE S G，KIM B K，SOHN S S，et al. Effect of local-brittle-zone (LBZ) microstructures on crack initiation and propagation in three Mo-added high-strength low-alloy (HSLA) steels[J]. Materials Science & Engineering A，2019，760：125-133.
[25] TANAKA M，TARLETON E，ROBERTS S G. The brittle-ductile transition in single-crystal iron[J]. Acta Materialia，2008，56：5123-5129.
[26] HIGASHIDA K，TANAKA M. Mechanism behind brittle-to-ductile transition understood by the interaction between a crack and dislocations[J]. International Journal of Iron and Steel Research，2012，52：704-709.
[27] GUMBSCH P，RIEDLE J，HARTMAIER A，et al. Controlling factors for the brittle-to-ductile transition in tungsten single crystals[J]. Science，1998，282：1293-1295.
[28] 刘建新，涂小慧，鄢文彬，等. 两种低合金高强度钢的低温疲劳裂纹扩展行为研究[J]. 机械工程材料，1991(1)：47-51. LIU Jianxin，TU Xiaohui，YAN Wenbin，et al. Fatigue cracking behavior of two HSLA steels at low temperature[J]. Materials for Mechanical Engineering，1991(1)：47-51.

低合金贝氏体高强钢模拟焊接粗晶热影响区低温疲劳韧脆转变行为及机制

Low-temperature Fatigue Ductile-to-brittle Transition Behavior and Mechanism for Simulated Coarse-grained Heat-affected Zone of a High-strength Low-alloy Bainite Steel

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