Effect of QLT heat treatment on microstructure and tensile properties of 5.5Ni steel

doi:10.13251/j.issn.0254-6051.2024.08.014

Abstract

Abstract: Microstructure, reversed austenite content and tensile properties of 5.5Ni steel after quenching + intercritical quenching + tempering (QLT) heat treatment were studied by means of scanning electron microscope (SEM), electron backscatter diffraction (EBSD), transmission electron microscope (TEM) and X-ray diffraction (XRD). The effect of quenching temperature in two-phase region on the microstructure and tensile properties of the 5.5Ni steel was analyzed. The results show that the microstructure of the tested steel after QLT heat treatment is tempered martensite + critical ferrite + reversed austenite. The quenching temperature in the two-phase region has great influence on the content of reversed austenite, yield strength and yield ratio, but the quenching and tempering temperature have a little influence. With the increase of quenching temperature in the two-phase region, the content of reversed austenite increases, the tensile strength is basically unchanged, and the yield strength and yield ratio decrease at the same time. The stress-induced transformation of bulk reversed austenite at the triple junction into martensite during the tensile process is the main reason for the difference in yield ratio of the 5.5Ni steel quenched in the two-phase region at different temperatures.

Key words: intercritical quenching, reversed austenite, yield ratio, QLT

CLC Number:

TG156.1

Zang Yan, Zhu Yingguang, Zhang Chi, An Tao, Liu Wenyue. Effect of QLT heat treatment on microstructure and tensile properties of 5.5Ni steel[J]. Heat Treatment of Metals, 2024, 49(8): 88-93.

References

[1]]李荣斌, 秦品强, 陈永强, 等. 不同两相区淬火温度对9Ni钢组织与性能的影响[J]. 金属热处理, 2021, 46(7): 18-22.
Li Rongbin, Qin Pinqiang, Chen Yongqiang, et al. Effect of different intercritical quenching temperature on microstructure and properties of 9Ni steel[J]. Heat Treatment of Metals, 2021, 46(7): 18-22.
[2]]陈凯力, 席连云, 谢章龙, 等. LNG储罐用新型7%Ni钢的研制[J]. 油气储运, 2021, 40(10): 1181-1186, 1200.
Chen Kaili, Xi Lianyun, Xie Zhanglong, et al. Development of new 7%Ni steel for LNG storage tanks[J]. Oil and Gas Storage and Transportation, 2021, 40(10): 1181-1186, 1200.
[3]]许立雄, 武会宾, 牟丹. 两相区淬火对7Ni钢微观组织和力学性能的影响[J]. 材料工程, 2018, 46(8): 113-119.
Xu Lixiong, Wu Huibin, Mu Dan. Effect of quenching in dual-phase region on microstructure and mechanical properties of 7Ni steel[J]. Journal of Materials Engineering, 2018, 46(8): 113-119.
[4]]谢振家, 尚成嘉, 周文浩, 等. 低合金多相钢中残余奥氏体对塑性和韧性的影响[J]. 金属学报, 2016, 52(2): 224-232.
Xie Zhenjia, Shang Chengjia, Zhou Wenhao, et al. Effect of retained austenite on ductility and toughness of a low alloyed multiphase steel[J]. Acta Metallica Sinica, 2016, 52(2): 224-232.
[5]]王猛. Ni系超低温用钢强韧化机理研究及生产技术开发[D]. 沈阳: 东北大学, 2017.
[6]]阚立烨, 朱拓, 叶其斌, 等. 富Ni奥氏体对1 GPa级超高强海工钢强度与韧性的影响[J]. 材料与冶金学报, 2022, 21(3): 216-219.
Kan Liye, Zhu Tuo, Ye Qibin, et al. Effect of Ni-rich austenite on strength and toughness of 1 GPa grade ultra-high strength offshore steel[J]. Journal of Materials and Metallurgy, 2022, 21(3): 216-219.
[7]]罗应明, 庞辉勇, 龙杰, 等. 热处理工艺对7%Ni钢性能和组织的影响[C]//压力容器先进技术——第十届全国压力容器学术会议论文集(上). 中国机械工程学会压力容器分会, 2021: 96-100.
[8]]张坤, 唐荻, 武会宾, 等. 两相区淬火对9Ni钢中逆转变奥氏体的影响[J]. 材料热处理学报, 2012, 33(8): 59-63.
Zhang Kun, Tang Di, Wu Huibin, et al. Effect of quenching in dual-phase region on the reversed austenite in 9Ni steel[J]. Transactions of Materials and Heat Treatment, 2012, 33(8): 59-63.
[9]]杨跃辉. 两相区保温过程中9Ni钢组织的演化及其对钢性能的影响[J]. 热加工工艺, 2015, 44(22): 169-172, 175.
Yang Yuehui. Evolution of microstructure during holding process at two phase region and its effect on properties of 9Ni steel[J]. Hot Working Technology, 2015, 44(22): 169-172, 175.
[10]]刘文斌, 战国锋, 黄峰. 回火温度对7Ni钢组织和性能的影响[J]. 金属热处理, 2020, 45(12): 63-68.
Liu Wenbin, Zhan Guofeng, Huang Feng. Effect of tempering temperature on microstructure and properties of 7Ni steel[J]. Heat Treatment of Metals, 2020, 45(12): 63-68.
[11]]李铖, 彭其春, 童志博, 等. 不同热处理工艺对9Ni低温容器用钢组织与性能的影响[J]. 金属热处理, 2024, 49(2): 98-103.
Li Cheng, Peng Qichun, Tong Zhibo, et al. Effect of different heat treatment processes on microstructure and properties of 9Ni cryogenic vessel steel[J]. Heat Treatment of Metals, 2024, 49(2): 98-103.
[12]]邓伟, 秦小梅. 临界淬火工艺处理高强结构钢Q690GJ的韧化机理[J]. 金属热处理, 2021, 46(12): 247-252.
Deng Wei, Qin Xiaomei. Fracture resistance mechanism of high strength structural steel Q690GJ treated by intercritical quenching process[J]. Heat Treatment of Metals, 2021, 46(12): 247-252.

[1]	Guo Chengyu, Zhang Zhe, Zhang Chi, Dai Chunduo, Hou Huaxing, Li Jiangwen. Effect of Q&P process on microstructure and properties of 1000 MPa grade high strength steel [J]. Heat Treatment of Metals, 2024, 49(8): 67-73.
[2]	Hu Ang, Wu Run, Li Zhongbo, Wu Teng. Effect of intercritical quenching on toughening and properties of low alloy wear-resistant steel [J]. Heat Treatment of Metals, 2024, 49(3): 22-27.
[3]	Yang Ying, Pan Shiliang, Xu Yuanyuan, Wang Zemin, Wang Zhanyong. Evolution of reversed austenite in ultra-low carbon bainitic steel during intercritical tempering [J]. Heat Treatment of Metals, 2024, 49(3): 182-189.
[4]	Li Cheng, Peng Qichun, Tong Zhibo, Liang Liang, Qi Jianghua, Xiao Aida, Dong Changfu. Effects of different heat treatment processes on microstructure and properties of 9Ni cryogenic vessel steel [J]. Heat Treatment of Metals, 2024, 49(2): 98-103.
[5]	Wu Fengjuan, Yang Hao, Qu Jinbo. Effect of cooling process on microstructure and mechanical property of Q500qE bridge steel [J]. Heat Treatment of Metals, 2023, 48(6): 130-135.
[6]	Wang Ping, Tian Shaokun, Zhu Hongwei, Yang Kun, Jin Yuanping, Wang Shuqing, Huang Yanjun, Zhu Jing. Heat treatment process of 00Ni18Co7Mo5Ti steel for belting of star arrow relief lock [J]. Heat Treatment of Metals, 2023, 48(2): 189-194.
[7]	Chen Rui, Bao Cuimin, Yang Zhipeng, Lin Lin. Stability of reversed austenite in 9%Ni steel after heat treatment [J]. Heat Treatment of Metals, 2023, 48(2): 228-231.
[8]	Zhang Meng, Wu Guangliang. QLT heat treatment process of NM500 wear-resistant steel [J]. Heat Treatment of Metals, 2023, 48(10): 157-162.
[9]	Zhao Shuai, Li Qingchun, An Haoying, Chen Shuying, Chang Guowei. Formation of reversed austenite and its effect on properties of Cr13Ni4Mo steel [J]. Heat Treatment of Metals, 2023, 48(1): 95-99.
[10]	Zhang Yuefei, Wang Kun, Zhang Xuefeng, Zou Yang, Du Qunchao. Low yield ratio control strategy for thin 12MnNiVR storage tank steel plate [J]. Heat Treatment of Metals, 2022, 47(6): 173-177.
[11]	Qiu Xuyangfan, Yang Zhuoyue, Ding Yali. Solid solution treatment for improving cryogenic temperature toughness of Cr-Ni-Mo-Ti maraging stainless steel [J]. Heat Treatment of Metals, 2022, 47(1): 44-48.
[12]	Qi Xiangyu, Yan Ling, Li Guanglong, Li Wenbin, Du Linxiu. Effect of reversed austenite stability on strength and toughness of medium-Mn steel [J]. Heat Treatment of Metals, 2021, 46(9): 205-210.
[13]	Li Rongbin, Qin Pinqiang, Chen Yongqiang, Li Ke, Long Wenyong. Effect of different intercritical quenching temperature on microstructure and properties of 9Ni Steel [J]. Heat Treatment of Metals, 2021, 46(7): 18-22.
[14]	Yang Peng, Zhang Pengyan, Ji Jiuzhang. Effect of intercritical quenching and tempering on microstructure and mechancial properties of 600 MPa HSLA steel [J]. Heat Treatment of Metals, 2021, 46(6): 59-64.
[15]	Qiu Xuyangfan, Yang Zhuoyue, Ding Yali. Effect of retained/reversed austenite on improving -196 ℃ cryogenic impact property of high strength stainless steel [J]. Heat Treatment of Metals, 2021, 46(5): 71-74.