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| Effect of Final Cooling Temperature on Precipitates, Microstructure, and Hardness of Ti-V-Mo Complex Microalloyed Steel |
HAN Yangyi1,2, ZHANG Tenghao1, ZHANG Ke1( ), ZHAO Shiyu3, WANG Chuangwei4, YU Qiang5, LI Jinghui1, SUN Xinjun2 |
1.School of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, China
2.Institute for Tructural Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China
3.Long Products Business Division, Ma'anshan Iron and Steel Co., Ltd., Ma'anshan 243003, China
4.Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China
5.Hunan Hualing Lianyuan Iron and Steel Co., Ltd., Technical Center, Loudi 411101, China |
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Cite this article:
HAN Yangyi, ZHANG Tenghao, ZHANG Ke, ZHAO Shiyu, WANG Chuangwei, YU Qiang, LI Jinghui, SUN Xinjun. Effect of Final Cooling Temperature on Precipitates, Microstructure, and Hardness of Ti-V-Mo Complex Microalloyed Steel. Chinese Journal of Materials Research, 2025, 39(7): 533-541.
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Abstract A Ti-V-Mo composite microalloyed experimental steel was subjected to series heating-deformation treatment via Gleeble-3800 thermal simulation tester, i.e. firstly it was heated to 1250 oC and kept for 180 s, then cooled down to 890 oC and kept for a certain period of time; Subsequently, compression and deformation treatments were carried out; Afterwards, it was cooled to different (final cooling) temperatures and finally water-quenched. The effect of final cooling temperature on the precipitates, microstructure transformation, and hardness of the steel was systematically studied using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Vickers hardness tester. The precipitation behavior of carbides (Ti, V, Mo)C and its influence on the variation of microstructure and hardness of the steels quenched at different final cooling temperatures were clarified. The results indicated that the microstructure of the test steels consist of granular bainite at 590 oC, polygonal ferrite at temperatures ranging from 630 oC to 690 oC and a mixture of ferrite and martensite at 730 oC. With the increasing final cooling temperature, the average grain size of ferrite increased from 2.7 μm to 5.6 μm, and the average size of (Ti, V, Mo)C precipitates increased from 3.45 nm to 4.71 nm. With the increasing final cooling temperature from 590 oC to 730 oC, the hardness increased first, then remain stable and then decreased rapidly. For the isothermal final cooling temperature within the range 630~660 oC, the hardness was up to 485HV, which was due to the saturation of the fine grain strengthening of ferrite and the precipitation strengthening of (Ti, V, Mo)C. The fine grain strengthening caused by ferrite grain refinement and the precipitation strengthening caused by the precipitation of (Ti, V, Mo)C were dominant factors of hardness change at different final cooling temperatures.
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Received: 15 August 2024
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| Fund: National Natural Science Foundation of China(52474340);Anhui Province Higher Education Scientific Research Project(2023AH051090) |
Corresponding Authors:
ZHANG Ke, Tel: 18955578155, E-mail: huzhude@yeah.net
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