SH-CCT diagram and microstructure and properties of heat-affected-zone of 1 400 MPa ultra high strength steel

CAO Zhilong; ZHU Hao; AN Tongbang; WANG Chenji; MA Chengyong; Peng Yun

doi:10.12073/j.hjxb.20220913001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(8): 109-115. > DOI: 10.12073/j.hjxb.20220913001

CAO Zhilong, ZHU Hao, AN Tongbang, WANG Chenji, MA Chengyong, Peng Yun. SH-CCT diagram and microstructure and properties of heat-affected-zone of 1 400 MPa ultra high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(8): 109-115. DOI: 10.12073/j.hjxb.20220913001

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SH-CCT diagram and microstructure and properties of heat-affected-zone of 1 400 MPa ultra high strength steel

1.
Central Iron & Steel Research Institute, Beijing, 100081, China
2.
Shijiazhuang Tiedao University, Shijiazhuang, 050043, China

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Received Date: September 12, 2022
Available Online: July 20, 2023

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Abstract

Abstract

The effects of different cooling rates on the microstructure transformation and properties of the coarse grained heat affected zone (HAZ) of the 1 400 MPa ultra-high-strength steel were studied by using a Formastor-F Ⅱ automatic phase changer, combined with metallographic microscope (OM) and Vickers hardness test. According to the simulation results, the welding continuous cooling transformation curve (SH-CCT) is drawn, and the formula method is used to determine the optimal welding parameters combined with the welding process test. The results show that the critical transformation cooling rate of martensite in 1 400 MPa ultra-high strength steel is about 5 ℃/s. When the cooling rate is greater than 5 ℃/s, the microstructure of the coarse grained zone in the heat-affected zone is single lath martensite, and the hardness value is 487 ~ 509 HV5. When the cooling rate is less than 5 ℃/s, medium and high temperature phase transformation products appear in the structure of the coarse-grained region, which are lath bainite, granular bainite and ferrite, and the hardness value drops to 487 ~ 260 HV5. At the same time, M-A component also appeared in the tissue, and its content increased first and then decreased with the decrease of cooling rate. and the shape also changed from dispersed granular to intermittent long strip or block distribution. When welding 1 400 MPa ultra-high-strength steel with a thickness of 8 mm, the welding heat input is controlled within 20 kJ/cm, the microstructure of the coarse-grained zone is lath martensite, the hardness value is maintained at about 500 HV5, and no softening occurs in the coarse-grained region, which meets engineering requirements.

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"工业绿色发展工程科技战略及对策研究"课题组. 工业绿色发展工程科技战略及对策[J]. 中国工程科学, 2015, 17(7): 32 − 36. doi: 10.3969/j.issn.1009-1742.2015.07.008

The Research Group for Strategic Study on Green Development Engineering for Industry. Strategic study on green development engineering for industry[J]. Strategic Study of CAE, 2015, 17(7): 32 − 36. doi: 10.3969/j.issn.1009-1742.2015.07.008

张春霞, 王海风, 张寿荣, 等. 中国钢铁工业绿色发展工程科技战略及对策[J]. 钢铁, 2015, 50(10): 1 − 7. doi: 10.13228/j.boyuan.issn0449-749x.20150322

Zhang Chunxia, Wang Haifeng, Zhang Shourong, et al. Strategic study on green development of Chinese steel industry[J]. Iron & Steel, 2015, 50(10): 1 − 7. doi: 10.13228/j.boyuan.issn0449-749x.20150322

宁静, 王敖, 苏杰, 等. W含量对新型超高强度钢热塑性的影响[J]. 锻压技术, 2020, 45(9): 181 − 186. doi: 10.13330/j.issn.1000-3940.2020.09.031

Ning Jing, Wang Ao, Su Jie, et al. Influence of W content on thermoplasticity for new ultra-high strength steel[J]. Forging & Stamping Technology, 2020, 45(9): 181 − 186. doi: 10.13330/j.issn.1000-3940.2020.09.031

安同邦, 魏金山, 单际国, 等. 保护气成分对 1000 MPa级高强熔敷金属组织特征的影响[J]. 金属学报, 2019, 55(5): 575 − 584. doi: 10.11900/0412.1961.2018.00375

An Tongbang, Wei Jinshan, Shan Giguo, et al. Influence of shielding gas composition on microstructure characteristics of 1 000 MPa grade deposited metals[J]. Acta Metallurgica Sinica, 2019, 55(5): 575 − 584. doi: 10.11900/0412.1961.2018.00375

高野, 任家宽, 李志峰, 等. 奥氏体化温度对900 MPa级HSLA钢显微组织和晶体学演变的影响[J]. 材料研究学报, 2022, 36(1): 21 − 28.

Gao Ye, Ren Jiakuan, Li Zhifeng, et al. Effect of austenitizing temperature on microstructure and crystallographic evolution of 900 MPa grade HSLA steel[J]. Chinese Journal of Materials Research, 2022, 36(1): 21 − 28.

Ishikawa N, Sueyoshi H, Endo S. Critical condition for hydrogen induced cold cracking of high strength weld metal[C]// 2014 10th International Pipeline Conference. American Society of Mechanical Engineers, 2014.

安同邦, 单际国, 魏金山, 等. 热输入对 1000 MPa级工程机械用钢接头组织性能的影响[J]. 机械工程学报, 2014, 50(22): 42 − 49. doi: 10.3901/JME.2014.22.042

An Tongbang, Shan Jiguo, Wei Jinshan, et al. Effect of heat input on microstructure and performance of welded joint in 1 000 MPa grade steel for construction machinery[J]. Journal of Mechanical Engineering, 2014, 50(22): 42 − 49. doi: 10.3901/JME.2014.22.042

Wu X, Lin H, Luo W, et al. Microstructure and microhardness evolution of thermal simulated HAZ of Q & P980 steel[J]. Journal of Materials Research and Technology, 2021, 15: 6067 − 6078. doi: 10.1016/j.jmrt.2021.11.059

蒋庆梅, 张小强, 陈礼清, 等. 1000 MPa 级超高强钢的 SH-CCT 曲线及其热影响区的组织和性能[J]. 钢铁研究学报, 2014, 26(1): 47 − 51.

Jiang Qingmei, Zhang Xiaoqiang, Chen Liqing, et al. SH-CCT diagram, microstructure and properties of heat-affected zone in a 1 000 MPa grade extra high-strength steel[J]. Journal of Iron and Steel Research, 2014, 26(1): 47 − 51.

方俊飞, 徐震霖, 斯松华, 等. 不同冷速下 Q1100 高强钢焊接热影响区粗晶区的组织转变特征[J]. 机械工程材料, 2017, 41(1): 107 − 110. doi: 10.11973/jxgccl201701022

Fang Junfei, Xu Zhenlin, Si Songhua, et al. Microstructure transformation characteristic of CGHAZ of Q1100 high-strength steel at different cooling rates[J]. Materials for Mechanical Engineering, 2017, 41(1): 107 − 110. doi: 10.11973/jxgccl201701022

Weglowski M S, Zeman M, Lomozik M. Physical simulation of weldability of weldox 1300 steel[J]. Materials Science Forum, 2013, 762: 551 − 555. doi: 10.4028/www.scientific.net/MSF.762.551

Wang CH F, Wang M Q, Shi J, et al. Effect of microstructure refinement on the strength and toughness of low alloy martensitic steel[J]. Journal of Materials Science & Technology, 2007, 23(5): 659 − 664.

Lei X, Dong S, Huang J, et al. Phase evolution and mechanical properties of coarse-grained heat affected zone of a Cu-free high strength low alloy hull structure steel[J]. Materials Science and Engineering A, 2018, 718: 437 − 448.

邢淑清, 陆恒昌, 麻永林, 等. 800 MPa级高强钢焊接粗晶区再热循环的组织转变规律[J]. 材料工程, 2015, 43(7): 93 − 99.

Xing Shuqing, Lu Hengchang, Ma Yonglin, et al. Microstructure evolution of CG-HAZ reheated by second thermal cycle for 800 MPa grade high strength steel[J]. Journal of Materials Engineering, 2015, 43(7): 93 − 99.

Huda N, Wang Y, Li L, et al. Effect of martensite-austenite (MA) distribution on mechanical properties of inter-critical reheated coarse grain heat affected zone in X80 linepipe steel[J]. Materials Science and Engineering: A, 2019, 765: 138301. doi: 10.1016/j.msea.2019.138301

Fan L, Zhou D, Wang T, et al. Tensile properties of an acicular ferrite and martensite/austenite constituent steel with varying cooling rates[J]. Materials Science & Engineering A, 2014, 590: 224 − 231.

Wang C, Wu X, Jie L, et al. Transmission electron microscopy of martensite/austenite islands in pipeline steel X70[J]. Materials Science & Engineering A, 2006, 438(11): 267 − 271.

Wang S C, Yang J R. Effects of chemical composition, rolling and cooling conditions on the amount of martensite/austenite (M/A) constituent formation in low carbon bainitic steels[J]. Materials Science and Engineering:A, 1992, 154(1): 43 − 49. doi: 10.1016/0921-5093(92)90361-4

Kim H K, Moon J I, Kim W K, et al. Influence of carbon equivalent value on the weld bead bending properties of high-strength low-alloy steel plates[J]. Journal of Materials Science & Technology, 2016, 33(4): 321 − 329.

Long X Y, Zhang F C, Yang Z N. Study on microstructures and properties of carbide-free and carbide-bearing bainitic steels[J]. Materials Science and Engineering: A, 2018(715): 10 − 16.

王旭, 魏军, 仇圣桃, 等. 12Mn钢CCT曲线的测定与分析[J]. 热加工工艺, 2021, 50(4): 147 − 150.

Wang Xu, Wei Jun, Chou Shengtao, et al. Measurement and analysis of CCT curve of 12Mn steel[J]. Hot Working Technology, 2021, 50(4): 147 − 150.

Sa A, Vj B, Mav F, et al. Thermomechanical simulation of the heat-affected zones in welded ultra-high strength steels: Microstructure and mechanical properties[J]. Materials & Design, 2021, 213.

刘旭辉, 张波, 肖爱达, 等. 工程机械用960QT钢焊接粗晶区组织及性能研究[J]. 特殊钢, 2019, 40(1): 63 − 67. doi: 10.3969/j.issn.1003-8620.2019.01.017

Liu Xuhui, Zhang Bo, Xiao Aida, et al. Study on structure and performance of coarse grained heat affected zone(CGHAZ) of machinery steel 960QT[J]. Special Steel, 2019, 40(1): 63 − 67. doi: 10.3969/j.issn.1003-8620.2019.01.017

张文钺. 焊接冶金学[M]. 北京: 机械工业出版社, 1999.

Zhang Wenyue. Welding metallurgy[M]. Beijing: China Machine Press, 1999.

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SH-CCT diagram and microstructure and properties of heat-affected-zone of 1 400 MPa ultra high strength steel