Effect of tempering cooling method on microstructure and properties of 80 mm thick high strength and toughness Q690D steel

doi:10.13251/j.issn.0254-6051.2024.12.007

Abstract

Abstract: Rockwell hardness tester, optical microscope, scanning electron microscope and transmission electron microscope were used to study the effects of tempering cooling method on the hardness, microstructure and -20 ℃ low-temperature impact toughness of 80 mm thick Q690D steel. The results show that the tempering cooling method has little effect on the hardness distribution in the thickness direction of the quenched and tempered steel, compared with the quenched state hardness, the maximum hardness difference decreases from 13 HRC to 6 HRC. After tempering at 620 ℃ followed by air cooling, carbides precipitate along austenite grain boundary and lath boundary, the impact absorbed energy of the steel at -20 ℃ is 65 J, and the impact fracture morphology is quasi cleavage. After tempering followed by water cooling (5-8 ℃/s), the precipitation of carbide at grain boundary and strip boundary is restrained, the impact absorbed energy of the steel at -20 ℃ is increased to 210 J, and the fracture morphology is mainly dimples. After tempering followed by water cooling, the impact absorbed energy at -20 ℃ of industrial produced steel is 174-252 J, which is increased by 105% to 397% compared with air cooling.

Key words: Q690D, thickness specification, tempering cooling method, carbide precipitation, mechanical properties

CLC Number:

TG161

Yang Weiyu, Liu Ying, Liu Zetian, Jiang Bingkun. Effect of tempering cooling method on microstructure and properties of 80 mm thick high strength and toughness Q690D steel[J]. Heat Treatment of Metals, 2024, 49(12): 46-51.

References

[1]王向东, 周平, 侯东华, 等. 厚规格400 HBW级耐磨钢的截面显微组织性能研究[J]. 山东冶金, 2021, 43(3): 34-38.
Wang Xiangdong, Zhou Ping, Hou Donghua, et al. Research on microstructure and properties for 400 HBW thick wear-resistant steel plate[J]. Shandong Metallurgy, 2021, 43(3): 34-38.
[2]季德静, 杨维宇, 白雅琼. 高强韧工程机械用钢Q690D的淬火工艺优化[J]. 金属热处理, 2022, 47(9): 108-113.
Ji Dejing, Yang Weiyu, Bai Yaqiong. Optimization of quenching process of high strength and toughness Q690D steel for construction machines[J]. Heat Treatment of Metals, 2022, 47(9): 108-113.
[3]宋欣, 王根矶, 张国栋, 等. 厚规格调质高强钢Q890的研制与开发[J]. 材料热处理学报, 2014, 35(8): 147-152.
Song Xin, Wang Genji, Zhang Guodong, et al. Research and development of heavy gauge quenched and tempered high strength Q890 steel[J]. Transactions of Materials and Heat Treatment, 2014, 35(8): 147-152.
[4]段争涛, 李艳梅, 朱伏先, 等. 淬火温度对Q690D高强钢组织和力学性能的影响[J]. 金属热处理, 2012, 37(2): 81-85.
Duan Zhengtao, Li Yanmei, Zhu Fuxian, et al. Effect of quenching temperature on microstructure and mechanical properties of Q690D steel[J]. Heat Treatment of Metals, 2012, 37(2): 81-85.
[5]钟友坤. 调质处理工艺对Q690D钢微观组织和力学性能的影响[J]. 锻造技术, 2014, 35(12): 2851-2853.
Zhong Youkun. Effect of thermal refining process on microstructure and mechanical properties of Q690D steel[J]. Foundry Technology, 2014, 35(12): 2851-2853.
[6]郑建平. 回火温度对大厚度低碳高强度Q690D钢板组织和力学性能的影响[J]. 热处理, 2020, 35(3): 1-4.
Zheng Jianping. Effect of tempering temperatures on microstructure and mechanical property of low-carbon high-strength heavy Q690D steel plate[J]. Heat Treatment, 2020, 35(3): 1-4.
[7]杨维宇, 董瑞峰, 高峰, 等. 硼对60mm厚Q690D钢淬透性和力学性能的影响[J]. 钢铁, 2015, 50(2): 76-80.
Yang Weiyu, Dong Ruifeng, Gao Feng, et al. Effects of boron on hardenability and mechanical properties of 60 mm Q690D steel[J]. Iron and Steel, 2015, 50(2): 76-80.
[8]李敬, 刘辰, 杨跃惠, 等. 厚规格Q690D高强钢板的连续冷却转变行为[J]. 金属热处理, 2022, 47(9): 171-174.
Li Jing, Liu Chen, Yang Yuehui, et al. Continuous cooling transformation behavior of high-strength Q690D heavy steel plate[J]. Heat Treatment of Metals, 2022, 47(9): 171-174.
[9]李德明, 雷宁宁, 张晋刚, 等. 快速回火对690 MPa 级别工程机械用钢板组织和性能的影响[J]. 金属热处理, 2023, 48(9): 75-81.
Li Deming, Lei Ningning, Zhang Jingang, et al. Effect of rapid tempering on microstructure and properties of 690 MPa grade steel plate for construction machinery[J]. Heat Treatment of Metals, 2023, 48(9): 75-81.

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