Effect of Q&P process on microstructure and properties of Fe-0.45C-1.6B high-boron steel

doi:10.13251/j.issn.0254-6051.2020.05.016

Abstract

Abstract: The microstructure and properties of Fe-0.45C-1.6B high-boron steel as-cast and after quenching and partitioning (Q&P) were analyzed by means of Thermo-Calc, OM, SEM, XRD, Rockwell hardness test and impact wear test. The results show that the as-cast microstructure of the high-boron steel is composed of a ferrite+martensite+retained austenite complex matrix and eutectic borides. Isothermal martensite transformation occurs below the Ms point in the Q&P process, the retained austenite in the matrix increases with the increase of quenching time, and reaches the limit when the quenching time is 120 s. While the retained austenite increases also with the increase of partitioning time, and reaches the maximum when the partitioning time is 80 s. However, more retained austenite causes the matrix too soft to support the boride, the wear resistance of the steel decreases.

Key words: Fe-0.45C-1.6B high-boron steel, quenching and partitioning, retained austenite, microstructure, wear resistance

CLC Number:

TG135.6

Li Mingwei, Wu Run, Wang Kai, Zeng Songsheng. Effect of Q&P process on microstructure and properties of Fe-0.45C-1.6B high-boron steel[J]. Heat Treatment of Metals, 2020, 45(5): 84-89.

References

[1]Lentz J, Arne Röttger, Theisen W. Solidification and phase formation of alloys in the hypoeutectic region of the Fe-C-B system[J]. Acta Materialia, 2015, 99: 119-129.
[2]Ma Shengqiang, Xing Jiandong, Liu Guofeng, et al. Effect of chromium concentration on microstructure and properties of Fe-3.5B alloy[J]. Materials Science and Engineering: A, 2010, 527(26): 6800-6808.
[3]Ozdemir O, Usta M, Bindal C, et al. Hard iron boride (Fe₂B) on 99.97wt% pure iron[J]. Vacuum, 2006, 80(11/12): 1391-1395.
[4]曾路, 吴腾, 吴润, 等. 冷轧高强双相钢中残留奥氏体的作用[J]. 金属热处理, 2018, 43(10): 1-4.
Zeng Lu, Wu Teng, Wu Run, et al. Action of retained austenite in cold rolled high strength dual phase steel[J]. Heat Treatment of Metals, 2018, 43(10): 1-4.
[5]李金鑫, 黄兴民, 张雷, 等. 淬火配分处理对锻态Fe-0.2C-9Mn-3.5Al钢显微组织及力学行为的影响[J]. 金属热处理, 2020, 45(2): 87-93.
Li Jinxin, Huang Xingmin, Zhang Lei, et al. Influence of quenching and partitioning treatment on microstructure and mechanical behaviors of forged Fe-0.2C-9Mn-3.5Al steel[J]. Heat Treatment of Metals, 2020, 45(2): 87-93.
[6]霍颜秋, 张梦贤, 王海波, 等. 低碳20Mn2SiVB钢贝氏体相变及其TRIP效应[J]. 金属热处理, 2014, 39(10): 72-75.
Huo Yanqiu, Zhang Mengxian, Wang Haibo, et al. Bainite transformation and TRIP effect in low carbon 20Mn2SiVB steel[J]. Heat Treatment of Metals, 2014, 39(10): 72-75.
[7]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: 75-88.
[8]任振全, 田亚强, 李然, 等. I&Q&P工艺预先Mn配分处理低碳硅锰钢的组织与性能[J]. 金属热处理, 2016, 41(12): 113-116.
Ren Zhenquan, Tian Yaqiang, Li Ran, et al. Microstructure and properties of low carbon silicon manganese steel treated by Mn pre-partitioning I&Q&P process[J]. Heat Treatment of Metals, 2016, 41(12): 113-116.
[9]于震, 符寒光, 蒋业华, 等. 铝含量对Fe-Cr-B-Al合金组织性能影响的研究[J]. 材料·工艺, 2012(4): 40-44.
Yu Zhen, Fu Hanguang, Jiang Yehua, et al. Effect of aluminum content on solidification microstructure and properties of Fe-Cr-B-Al alloy[J]. Material and Technology, 2012(4): 40-44.

[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]	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.
[8]	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.
[9]	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.
[10]	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.
[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.