Austenite grain growth and continuous cooling phase transformation of  EH40 ship plate steel

doi:10.13251/j.issn.0254-6051.2023.12.032

Abstract

Abstract: Gleeble-3800 testing machine was used to conduct thermal simulation tests on EH40 ship plate steel. The coarsening behavior of austenite grain and the microstructure evolution at different heating temperatures were observed by metallographic microscope (OM). The hardness change of EH40 steel at different cooling rates was analyzed using Vickers hardness tester. The results show that the coarsening temperature of austenite is above 1200 ℃. The microstructure of austenite at 950 ℃ and undeformation is mainly composed of ferrite and pearlite in the cooling rate range of 0.5-1 ℃/s without deformation after holding at 950 ℃. When the cooling rate reaches 2 ℃/s, granular bainite and lath bainite are observed in the microstructure. With the increase of cooling rate, the lath bainite proportion gradually increases and is homogenized, the morphology of lath gradually refines, and the matrix hardness increases from 157 HV5 to 214 HV5. After 60% deformation, the grain of EH40 steel is finer than that of the undeformed steel, the ferritic phase transformation zone is enlarged, and the matrix hardness is increased from 164 HV5 to 234 HV5.

Key words: cooling rate, EH40 steel, microstructure evolution, hardness, austenite grain growth

CLC Number:

TG161

Li Wenmo, Liu Fangfang, Wang Jiaji, Jiang Jianbo, Jiang Kun. Austenite grain growth and continuous cooling phase transformation of EH40 ship plate steel[J]. Heat Treatment of Metals, 2023, 48(12): 189-193.

References

[1]王纳, 张宇, 麻晗, 等. 大线能量钢板EH40轧制工艺和焊接性能研究[J]. 精密成形工程, 2022, 14(10): 78-84.
Wang Na, Zhang Yu, Ma Han, et al. Research on rolling process and welding properties of EH40 suitable for large heat input welding[J]. Precision Forming Engineering, 2022, 14(10): 78-84.
[2]安海玉, 郝鑫, 刘忠满, 等. 高强度船体结构用钢EH40生产实践[J]. 宽厚板, 2021, 27(2): 23-26.
An Haiyu, Hao Xin, Liu Zhongman, et al. Production practice of higher-Strength hull structural steel EH40[J]. Wide Thick Plate, 2021, 27(2): 23-26.
[3]张鑫. EH40特厚船板钢热变形行为与组织细化研究[D]. 鞍山: 辽宁科技大学, 2020.
Zhang Xin. Study on hot deformation behavior and microstructure refinement of EH40 extra thick ship plate steel[D]. Anshan: Liaoning University of Science and Technology, 2020.
[4]Varshney A, Sangal S, Kundu S, et al. Super strong and highly ductile low alloy multiphase steels consisting of bainite, ferrite and retained austenite[J]. Materials and Design, 2016, 95(8): 75-88.
[5]张迪. 贝氏体钢轨热处理工艺优化及疲劳断裂行为的研究[D]. 包头: 内蒙古科技大学, 2022.
Zhang Di. Study on heat treatment process optimization and fatigue fracture behavior of bainite rail[D]. Baotou: Inner Mongolia University of Science and Technology, 2022.
[6]郑丽丽, 彭军, 安胜利, 等. 贝氏体组织钢的研究与应用现状[J]. 内蒙古科技大学学报, 2019, 38(4): 344-348.
Zheng Lili, Peng Jun, An Shengli, et al. Research and application status of bainite microstructure steel[J]. Journal of Inner Mongolia University of Science and Technology, 2019, 38(4): 344-348.
[7]史远, 戴观文, 安治国, 等. 高强贝氏体非调质钢的奥氏体连续冷却相变[J]. 金属热处理, 2019, 44(2): 25-29.
Shi Yuan, Dai Guanwen, An Zhiguo, et al. Continuous cooling transformation of austenite for high strength bainitic non-quenched and tempered steel[J]. Heat Treatment of Metals, 2019, 44(2): 25-29.
[8]赵文波, 赵博深, 李广州, 等. 表面充氢对TA2在草酸溶液中腐蚀行为的影响[J]. 表面技术, 2020, 49(4): 339-346.
Zhao Wenbo, Zhao Boshen, Li Guangzhou, et al. Corrosion behaviors of TA2 in oxalic acid solution after surface hydrogen charging[J]. Surface Technology, 2020, 49(4): 339-346.
[9]李凡, 张恒, 陈其伟, 等. 冷却速度对厚重H型钢组织与性能的影响[J]. 安徽工业大学学报(自然科学版), 2022, 39(3): 262-267.
Li Fan, Zhang Heng, Chen Qiwei, et al. Effect of cooling rate on microstructure and properties of heavy H-beam[J]. Journal of Anhui University of Technology (Natural Science Edition), 2022, 39(3): 262-267.
[10]陈闯. 轧制及热处理对铁素体不锈钢组织、性能的影响[D]. 长春: 长春工业大学, 2022.
Chen Chuang. Effect ofrolling and heat treatment on microstructure and properties of ferritic stainless steel[D]. Changchun: Changchun University of Technology, 2022.
[11]Wang Xinwang, Fan Lixu, Yu Rong, et al. Low-temperature corrosion behavior of laser cladding metal-based alloy coatings on EH40 high-strength steel for icebreaker[J]. High Temperature Materials and Processes, 2022, 41(1): 434-448.
[12]秦汉伟, 肖炯, 王迎春, 等. 冷却条件对EH40钢板坯表层奥氏体晶粒长大的影响[J]. 中国冶金, 2022, 32(11): 65-72.
Qin Hanwei, Xiao Jiong, Wang Yingchun, et al. Effect of cooling conditions on surface austenite grain growth of EH40 steel slab[J]. China Metallurgy, 2022, 32(11): 65-72.
[13]Sun Zhihua, Wu Jiajia, Zhang Dun, et al. Influence of nitrate concentrations on EH40 steel corrosion affected by coexistence of Desulfovibrio desulfuricans and Pseudomonas aeruginosa bacteria[J]. Journal of Oceanology and Limnology, 2022, 40(4): 13-14.
[14]武绍文, 张彩军, 郑非凡, 等. EH40钢中第二相粒子对奥氏体尺寸的影响[J]. 金属热处理, 2019, 44(7): 88-92.
Wu Shaowen, Zhang Caijun, Zheng Feifan, et al. Effect of second phase particles on austenite grain size in EH40 steel[J]. Heat Treatment of Metals, 2019, 44(7): 88-92.
[15]张彩军, 武绍文, 吴哲, 等. 低碳钢铁素体相变析出行为[J]. 金属热处理, 2019, 44(6): 51-54.
Zhang Caijun, Wu Shaowen, Wu Zhe, et al. Precipitation behavior of ferrite transformation of low carbon steel[J]. Heat Treatment of Metals, 2019, 44(6): 51-54.
[16]Liu Chunquan, Peng Qichun, Xue Zhengliang. Study on rolling process and heat treatment of high strength ship plate steel EH40[J]. Metallurgical and Materials Engineering, 2018, 24(3): 200-201.
[17]范丽伟, 白锦函, 刘艳玲, 等. 安钢高强度船板EH40的研制实践[J]. 宽厚板, 2011, 17(2): 1-3.
Fan Liwei, Bai Jinhan, Liu Yanling, et al. Development practice of high strength ship plate EH40 at Anyang steel[J]. Wide and Thick Plate, 2011, 17(2): 1-3.

Austenite grain growth and continuous cooling phase transformation of EH40 ship plate steel

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