The influence of heating process on the microstructure and properties of 700 MPa grade automobile beam steel

XU Zhen; TIAN Zhiwen; FENG Xiaoyong; ZHANG Fucheng

doi:10.7513/j.issn.1004-7638.2026.04.012

Volume 47 Issue 4

Aug. 2026

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XU Zhen, TIAN Zhiwen, FENG Xiaoyong, ZHANG Fucheng. The influence of heating process on the microstructure and properties of 700 MPa grade automobile beam steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 100-108. doi: 10.7513/j.issn.1004-7638.2026.04.012

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XU Zhen, TIAN Zhiwen, FENG Xiaoyong, ZHANG Fucheng. The influence of heating process on the microstructure and properties of 700 MPa grade automobile beam steel[J]. IRON STEEL VANADIUM TITANIUM, 2026, 47(4): 100-108. doi: 10.7513/j.issn.1004-7638.2026.04.012

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The influence of heating process on the microstructure and properties of 700 MPa grade automobile beam steel

doi: 10.7513/j.issn.1004-7638.2026.04.012

XU Zhen^{1, 2
,},
TIAN Zhiwen^{1, 2},
FENG Xiaoyong^{2, 3
,
,},
ZHANG Fucheng^{2, 3}

1.
North China University of Science and Technology, Institute of Metallurgy and Energy, Tangshan 063210, Hebei, China
2.
Yanzhao Iron and Steel Laboratory, Tangshan 063210, Hebei, China
3.
Hebei Iron and Steel Laboratory, North China University of Science and Technology, Tangshan 063210, Hebei, China

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Received Date: 2026-01-27
Accepted Date: 2026-03-17
Rev Recd Date: 2026-03-04
Publish Date: 2026-08-31

Abstract

Abstract

In this study the effects of heating temperature and soaking time on the microstructure and properties of Ti-microalloyed automotive beam steel 700L had been investigated. Optical Microscopy (OM), Transmission Electron Microscopy (TEM), and Electron Backscatter Diffraction (EBSD) had been used to analyze microstructural changes in Ti-microalloyed automotive beam steel 700L under different heating processes. Theoretical calculations had been conducted by using a Thermo-Calc thermodynamic simulation software to analyze the precipitation behavior of the second phase, combined with EDS spectral analysis to examine the morphology and size of the second phase precipitates. Finally, Vickers hardness (HV) testing evaluated the comprehensive mechanical properties of the specimens. Results indicate that heating temperatures between 1230-1260 ℃ suppress primary austenite grain growth, yielding fine-grain strengthening with hardness (HV) ranging from 315 to 332. With soaking at 1290 ℃, abnormal grain coarsening occurs alongside large (2 μm) TiN particles. Extending the holding time from 80 min to 160 min, austenite grain coarsening became pronounced, hardness (HV) decreased from 282 to 251, and the mechanical properties of the test steel deteriorated.
- Ti microalloying,
- automobile frame steel,
- heating process,
- performance stability,
- second phase precipitation

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References(22)

References

[1]	韩荣, 刘洪喜, 尉文超, 等. Ti-V-Mo微合金化22MnB5钢中析出相及其强化作用[J]. 钢铁, 2022, 57(2): 127-138. Han Rong, Liu Hongxi, Yu Wenchao, et al. Precipitates and their strengthening in Ti-V-Mo microalloyed 22MnB5 steel[J]. Iron and Steel, 2022, 57(2): 127-138. doi: 10.13228/j.boyuan.issn0449-749x.20210528 Han Rong, Liu Hongxi, Yu Wenchao, et al. Precipitates and their strengthening in Ti-V-Mo microalloyed 22MnB5 steel[J]. Iron and Steel, 2022, 57（2）: 127-138. doi: 10.13228/j.boyuan.issn0449-749x.20210528
[2]	Xu Ning, Wang Lingyu, Hu Jun, et al. Enabling strong and formable advanced high-strength steels through inherited homogeneous microstructure[J]. Scripta Materialia, 2025, 259: 116560.
[3]	吴林, 刘文胜, 张可, 等. Ti微合金淬火钢等温回火过程中组织及硬度变化[J]. 材料热处理学报, 2023, 44(11): 184-191. Wu Lin, Liu Wensheng, Zhang Ke, et al. Changes in microstructure and hardness of Ti-microalloyed quenched steel during isothermal tempering process[J]. Transactions of Materials and Heat Treatment, 2023, 44(11): 184-191. doi: 10.13289/j.issn.1009-6264.2023-0149 Wu Lin, Liu Wensheng, Zhang Ke, et al. Changes in microstructure and hardness of Ti-microalloyed quenched steel during isothermal tempering process[J]. Transactions of Materials and Heat Treatment, 2023, 44（11）: 184-191. doi: 10.13289/j.issn.1009-6264.2023-0149
[4]	Li Shihao, Kumar P, Chandar S, et al. Directed energy deposition of metals: processing, microstructures, and mechanical properties[J]. International Materials Reviews, 2023, 68(6): 605-647. doi: 10.1080/09506608.2022.2097411
[5]	Qin Zou, Ye Xihui, Li Yanguo, et al. Effects of Ti on microstructure and properties of Fe–Mn–Si–Cr–Ni shape memory alloy[J]. Materials Chemistry and Physics, 2023, 293: 126992. doi: 10.1016/j.matchemphys.2022.126992
[6]	Hu Jun, Li Xuyang, Zhang Zheming, et al. Overcoming the strength-ductility trade-off in metastable dual-phase heterogeneous structures using variable temperature rolling and annealing[J]. Materials Research Letters, 2023, 11(8): 648-654. doi: 10.1080/21663831.2023.2209596
[7]	Nagini M, Murty B S. Mechanical alloying: An advanced processing route for development of iron-based oxide-dispersion-strengthened alloys[J]. Advanced Engineering Materials, 2025, 27(6): 2401111. doi: 10.1002/adem.202401111
[8]	Song Hongyu, Wang Guodong, Liu Haitao. Effect of cold rolling on microstructure and texture evolution in strip casting Fe-36% Ni invar alloy foil[J]. Journal of Alloys and Compounds, 2021, 888: 161519.
[9]	Theska F, Nomoto K, Godor F, et al. On the early stages of precipitation during direct ageing of alloy 718[J]. Acta Materialia, 2020, 188: 492-503. doi: 10.1016/j.actamat.2020.02.034
[10]	王翊. 钛微合金化700 MPa级高强钢强化机理及工艺开发[D]. 北京: 北京科技大学, 2024. Wang Yi. Strengthening mechanism and process development of titanium microalloyed 700 MPa grade high strength steel[D]. Beijing: University of Science and Technology Beijing, 2024. Wang Yi. Strengthening mechanism and process development of titanium microalloyed 700 MPa grade high strength steel[D]. Beijing: University of Science and Technology Beijing, 2024.
[11]	雍岐龙. 钢铁材料中的第二相[M]. 北京: 冶金工业出版社, 2006. Yong Qilong. Secondary phases in steels[M]. Beijing: Metallurgical Industry Press, 2006. Yong Qilong. Secondary phases in steels[M]. Beijing: Metallurgical Industry Press, 2006.
[12]	闫昆, 李绍宏, 韩顺, 等. 固溶时间对18Ni(250)马氏体时效钢组织和性能的影响[J]. 材料热处理学报, 2024, 45(12): 159-166. Yan Kun, Li Shaohong, Han Shun, et al. Effect of solution treatment time on microstructure and properties of 18Ni(250) maraging steel[J]. Transactions of Materials and Heat Treatment, 2024, 45(12): 159-166. doi: 10.13289/j.issn.1009-6264.2024-0066 Yan Kun, Li Shaohong, Han Shun, et al. Effect of solution treatment time on microstructure and properties of 18Ni(250) maraging steel[J]. Transactions of Materials and Heat Treatment, 2024, 45（12）: 159-166. doi: 10.13289/j.issn.1009-6264.2024-0066
[13]	吕志伟. 钛微合金钢中纳米碳化物等温析出及其强化效果研究[D]. 镇江: 江苏大学, 2021. Lü Zhiwei. Investigation on isothermal precipitation and strengthening effect of nano carbide in titanium micro-alloyed steel[D]. Zhenjiang: Jiangsu University, 2021. Lü Zhiwei. Investigation on isothermal precipitation and strengthening effect of nano carbide in titanium micro-alloyed steel[D]. Zhenjiang: Jiangsu University, 2021.
[14]	杜开平, 于月光, 张淑婷, 等. 超快速冷却条件下Ti微合金钢中纳米碳化物及其强化作用[J]. 有色金属科学与工程, 2016, 7(4): 27-32. Du Kaiping, Yu Yueguang, Zhang Shuting, et al. Nano-carbide precipitates in Ti microalloyed steel under ultra fast cooling condition and their strengthening effect[J]. Nonferrous Metals Science and Engineering, 2016, 7(4): 27-32. doi: 10.13264/j.cnki.ysjskx.2016.04.005 Du Kaiping, Yu Yueguang, Zhang Shuting, et al. Nano-carbide precipitates in Ti microalloyed steel under ultra fast cooling condition and their strengthening effect[J]. Nonferrous Metals Science and Engineering, 2016, 7（4）: 27-32. doi: 10.13264/j.cnki.ysjskx.2016.04.005
[15]	王广连, 朱荣, 申景霞, 等. 20CrMnTi渗碳齿轮钢中Ti(C, N)的粗化行为[J]. 北京科技大学学报, 2009, 31(S1): 182-184. Wang Guanglian, Zhu Rong, Shen Jingxia, et al. Ostwald ripening of Ti (C, N) in 20CrMnTi gear steels[J]. Journal of University of Science and Technology Beijing, 2009, 31(S1): 182-184. doi: 10.13374/j.issn1001-053x.2009.s1.044 Wang Guanglian, Zhu Rong, Shen Jingxia, et al. Ostwald ripening of Ti (C, N) in 20CrMnTi gear steels[J]. Journal of University of Science and Technology Beijing, 2009, 31（S1）: 182-184. doi: 10.13374/j.issn1001-053x.2009.s1.044
[16]	Chen Chihyuan, Liao Menghsuan. Synergistic effects of carbon content and Ti/Mo ratio on precipitation behavior of HSLA steel: Insights from experiment and critical patent analysis[J]. Materials & Design, 2020, 186: 108-361. doi: 10.1016/j.matdes.2019.108361
[17]	Wang Zhenqiang, Sun Xinjun, Yang Zhigang, et al. Effect of Mn concentration on the kinetics of strain induced precipitation in Ti microalloyed steels[J]. Materials Science and Engineering: A, 2013, 561: 212-219.
[18]	Mukherjee S, Timokhina I, Zhu Chen, et al. Clustering and precipitation processes in a ferritic titanium-molybdenum microalloyed steel[J]. Journal of Alloys and Compounds, 2017, 690: 621-632. doi: 10.1016/j.jallcom.2016.08.146
[19]	胡继康, 殷立涛, 周玉成, 等. 二次固溶处理对低温用马氏体时效钢组织与力学性能的影响[J]. 材料热处理学报, 2025, 46(9): 133-141. Hu Jikang, Yin Litao, Zhou Yucheng, et al. Effect of secondary solution treatment on microstructure and mechanical properties of maraging steel for low temperature application[J]. Transactions of Materials and Heat Treatment, 2025, 46(9): 133-141. doi: 10.13289/j.issn.1009-6264.2024-0513 Hu Jikang, Yin Litao, Zhou Yucheng, et al. Effect of secondary solution treatment on microstructure and mechanical properties of maraging steel for low temperature application[J]. Transactions of Materials and Heat Treatment, 2025, 46（9）: 133-141. doi: 10.13289/j.issn.1009-6264.2024-0513
[20]	Wang Yi, Che Zhichao, Chen Yufeng, et al. Influence mechanism of solution temperature on microstructure evolution and tensile properties of Ti microalloyed high strength steel CGLC700[J]. Journal of Materials Research and Technology, 2024, 30: 2936-2944. doi: 10.1016/j.jmrt.2024.04.027
[21]	Liu Tao, Long Mujun, Chen Dengfu, et al. Effect of coarse TiN inclusions and microstructure on impact toughness fluctuation in Ti micro-alloyed steel[J]. Journal of Iron and Steel Research International, 2018, 25(10): 1043-1053. doi: 10.1007/s42243-018-0149-5
[22]	Duan Haojian, Zhang Ying, Ren Ying, et al. Distribution of TiN inclusions in Ti-stabilized ultra-pure ferrite stainless steel slab[J]. Journal of Iron and Steel Research International, 2019, 26(9): 962-972. doi: 10.1007/s42243-018-0196-y