CCT curves and microstructure and properties of low-carbon high strength marine steel

doi:10.13251/j.issn.0254-6051.2022.04.010

Abstract

Abstract: Continuous cooling transformation curve (CCT curve) and effect of final cooling temperature after hot rolling on microstructure and properties of low-carbon high strength marine steel were studied by Gleeble-3500 thermal simulation test machine, optical microscope and scanning electron microscope. The results show that only ferrite and bainite transformations take place during the continuous cooling transformation of the tested steel. In the process of air cooling immediately after hot rolling and rapid cooling to different final cooling temperature, the room temperature microstructure is bainitic and polygonal ferrite, and the content of bainitic increases with the decrease of final cooling temperature. Compared with direct air cooling to room temperature, with the increase of final cooling temperature, the strength of the tested steel decreases at first and then increases, However, when the final cooling temperature increases to 650 ℃, the strength of the tested steel decreases. When the final cooling temperature is 600 ℃, the yield strength and tensile strength is the highest, as 644.28 MPa and 679.71 MPa respectively, and the best impact absorbed energy is 112 J at -20 ℃.

Key words: low-carbon high strength marine steel, CCT curve, final cooling temperature, microstructure, mechanical properties

CLC Number:

TG142.4

Chen Liansheng, Zhang Luyou, Tian Yaqiang, Yang Zixuan, Li Hongbin, Pan Hongbo, Wei Yingli. CCT curves and microstructure and properties of low-carbon high strength marine steel[J]. Heat Treatment of Metals, 2022, 47(4): 63-68.

References

[1]Han D. High performance steels: Initiative and practice[J]. Science China Technological Sciences, 2012, 55(7): 1774-1790.
[2]狄国标, 刘振宇, 郝利强, 等. 海洋平台用钢的生产现状及发展趋势[J]. 机械工程材料, 2008, 32(8): 1-3.
Di Guobiao, Liu Zhenyu, Hao Liqiang, et al. Present production state and development tendency of offshore platform steels[J]. Materials for Mechanical Engineering, 2008, 32(8): 1-3.
[3]Xie Z J, Fang Y P, Han G, et al. Structure-property relationship in a 960 MPa grade ultrahigh strength low carbon niobium-vanadium microalloyed steel: The significance of high frequency induction tempering[J]. Materials Science and Engineering A, 2014, 618(17): 112-117.
[4]王国栋. 高质量中厚板生产关键共性技术研发现状和前景[J]. 轧钢, 2019, 36(1): 1-8.
Wang Guodong. Status and prospects of research and development of key common technologies for high-quality heavy and medium plate production[J]. Steel Rolling, 2019, 36(1): 1-8.
[5]康永林. 中国中厚板产品生产现状及发展趋势[J]. 中国冶金, 2012, 22(9): 1-4.
Kang Yonglin. Production status and development trend of medium and heavy plate in China[J]. China Metallurgy, 2012, 22(9): 1-4.
[6]黄维, 张志勤, 高真凤, 等. 日本海洋平台用厚板开发现状[J]. 轧钢, 2012, 29(3): 38-42.
Huang Wei, Zhang Zhiqin, Gao Zhenfeng, et al. Development status of steel plate used for offshore platform in Japan[J]. Steel Rolling, 2012, 29(3): 38-42.
[7]程新安. 国外舰船用钢的回顾与展望[J]. 材料开发与应用, 1997, 12(2): 46-48.
Cheng Xin'an. Retrospect and prospect of foreign shipsteel[J]. Development and Application of Materials, 1997, 12(2): 46-48.
[8]王文杰. 高性能先进舰船用合金材料的应用现状及展望[J]. 材料导报, 2013, 27(7): 98-105.
Wang Wenjie. The application status and perspective of alloys for high performance and advanced naval vessels[J]. Materials Review, 2013, 27(7): 98-105.
[9]尹士科, 何长红, 李亚琳. 美国和日本的潜艇用钢及其焊接材料[J]. 材料开发与应用, 2008, 23(1): 58-65.
Yin Shike, He Changhong, Li Yalin. Submarine steel and welding consumables used in American and Japan[J]. Development and Application of Materials, 2008, 23(1): 58-65.
[10]张润智, 刘志琦. 控轧控冷工艺中终冷温度对高强建筑用钢组织与拉伸性能的影响[J]. 机械工程材料, 2020, 44(7): 66-69.
Zhang Runzhi, Liu Zhiqi. Effect of final cooling temperature in controlled rolling and cooling process on microstructure and tensile properties of high strength building steel[J]. Materials for Mechanical Engineering, 2020, 44(7): 66-69.
[11]杨建勋. 800 MPa级低合金高强钢板屈强比影响因素[J]. 金属热处理, 2013, 38(3): 52-55.
Yang Jianxun. Factors influencing yield ratio of 800 MPa grade HSLA steel plate[J]. Heat Treatment of Metals, 2013, 38(3): 52-55.
[12]钱亚军, 于青, 袁仁平. TMCP工艺对高强韧海工用特厚板低温韧性的影响[J]. 金属材料与冶金工程, 2019, 47(3): 42-48.
Qian Yajun, Yu Qing, Yuan Renping. Effect of TMCP process on low temperature toughness of high performance ultra heavy plates for marine engineering[J]. Metal Materials and Metallurgy Engineering, 2019, 47(3): 42-48.
[13]钟培道. 断裂失效分析[J]. 理化检验(物理分册), 2005, 41(7): 375-378.
Zhong Peidao. Fracture failure analysis[J]. Physical Testing and Chemical Analysis (Part A: Physical Testing), 2005, 41(7): 375-378.

[1]	Wang Yudai, Liu Yang, Zhu Yanyan, Tian Xiangjun, Cheng Xu, Ran Xianzhe, Qian Tingting. Effect of heat treatment on microstructure homogeneity and tensile properties of hybrid fabricated AerMet100 ultra-high strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 1-9.
[2]	Zhang Ziyan, Chen Jun, Chen Xiaoya, Li Quan'an, Liu Jianxin. Effect of solution and aging treatment on microstructure and corrosion resistance of Mg-4Sm-3Gd-0.5Zr alloy [J]. Heat Treatment of Metals, 2022, 47(4): 10-16.
[3]	Liang Enpu, Xu Le, Yang Yong, Wang Maoqiu. Effects of Al and Cu additions on microstructure and mechanical properties of 40CrNi3MoV steel [J]. Heat Treatment of Metals, 2022, 47(4): 17-23.
[4]	Qi Xiaoliang, Li Yan, Ding Wei, Zhao Zengwu. Effect of original microstructure of medium manganese TRIP steel containing Al on microstructure and mechanical properties after intercritical annealing [J]. Heat Treatment of Metals, 2022, 47(4): 24-29.
[5]	Chen Baoan, Zhang Jingyuan, Zhu Zhixiang, Han Yu, Pan Xuedong, Zhang Lei, Chen Suhong. Effect of chemical composition on microstructure and properties of high strength Al-Mg-Si alloy [J]. Heat Treatment of Metals, 2022, 47(4): 30-38.
[6]	Chen Dongjun, Li Guangyang, Liu Gang. Effect of aging treatment on microstructure and mechanical properties of AlSi9Cu3 HPDC aluminum alloy [J]. Heat Treatment of Metals, 2022, 47(4): 53-56.
[7]	Jia Changyuan, Huo Yuanming, He Tao, Huo Cunlong, Liu Keran. High temperature tensile deformation behavior and microstructure evolution law of 40CrNiMo steel [J]. Heat Treatment of Metals, 2022, 47(4): 69-74.
[8]	Wang Yunlong, Yu Wei, Zhang Yi, Shi Jiaxin, Li Minghui. Effect of austenitizing temperature on isothermal transformation and mechanical properties of bainite steel [J]. Heat Treatment of Metals, 2022, 47(4): 80-85.
[9]	Liu Liyan, Bi Wenzhen, Wei Xicheng. Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel [J]. Heat Treatment of Metals, 2022, 47(4): 93-99.
[10]	Luo Zaibin, Fan Zize, Peng Zhen. Research progress of light-weight high-entropy alloys [J]. Heat Treatment of Metals, 2022, 47(4): 100-107.
[11]	Fu Xibin, Chen Zihao, Zhang Ke, Zhao Shiyu, Sun Xinjun, Zhu Zhenghai, Liang Xiaokai, Yong Qilong. Effect of quenching temperature on microstructure and mechanical properties of high Ti low alloy wear-resistant steel [J]. Heat Treatment of Metals, 2022, 47(4): 122-127.
[12]	Su Pengji, Ma Yonglin, Dong Lili, Yang Xuefeng. Effect of magnetic field pre-annealing on microstructure and texture of CGO steel [J]. Heat Treatment of Metals, 2022, 47(4): 128-132.
[13]	Li Li, Zeng Yan, Wu Xiaochun. Heat treatment process optimization for 4Cr5Mo2VCo steel [J]. Heat Treatment of Metals, 2022, 47(4): 133-140.
[14]	Lü Jiesheng, Song Zhigang, He Jianguo, Feng Han, Zheng Wenjie, Zhu Yuliang. Microstructure transformation and strengthening-plasticization mechanism of S32205 duplex stainless steel after cold rolling and annealing [J]. Heat Treatment of Metals, 2022, 47(4): 141-145.
[15]	Wang Qi, Wu Guangliang. Effect of tempering temperature on microstructure and properties of 1100 MPa grade high-strength steel [J]. Heat Treatment of Metals, 2022, 47(4): 146-150.