|
|
Evolution of interfacial heat transfer, contact behavior and microstructure during sub-rapid solidification of molten steel with different hydrogen contents |
Cheng Lu1,2, Wan-lin Wang1,2, Chen-yang Zhu1,2, Jie Zeng1,2, Xin-yuan Liu3, Hua-long Li3 |
1 School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China
2 National Center for International Research of Clean Metallurgy, Central South University, Changsha 410083, Hunan, China
3 Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625, Jiangsu, China |
|
|
Abstract Typical Q235 low-carbon steel samples with different hydrogen contents (0.0004, 0.0008, and 0.0013 wt.%) were prepared by adjusting the environment humidity and moisture. The effects of hydrogen on interfacial heat transfer, contact behavior, and microstructure evolution were investigated using a novel droplet solidification technique. The results revealed that when the hydrogen content increases from 0.0004 to 0.0013 wt.%, the maximum heat flux between the molten steel and cooling substrate decreases from 8.01 to 6.19 MW/m2, and the total heat removed in the initial 2 s reduces from 10.30 to 8.27 MJ/m2. Moreover, the final contact angle between the molten steel and substrate increases from 103.741° to 113.697°, and the number of pores on the droplet bottom surface increases significantly from 21 to 210 with the increase in hydrogen. The surface roughness of the droplet bottom surface increases from 20.902 to 49.181 μm. In addition, the average grain size of the droplet increases from 14.778 to 33.548 μm with the increase in the hydrogen content. The interfacial contact condition becomes worse due to the escape of hydrogen from the steel matrix during the cooling process, which leads to the reduction in the interfacial heat transfer and the increase in the grain size.
|
Received: 28 November 2022
Published: 25 January 2024
|
|
|
|
Cite this article: |
Cheng Lu,Wan-lin Wang,Chen-yang Zhu, et al. Evolution of interfacial heat transfer, contact behavior and microstructure during sub-rapid solidification of molten steel with different hydrogen contents[J]. Journal of Iron and Steel Research International, 2024, 31(1): 215-223.
|
|
|
|
[1] |
Yang Liu, Jian-hua Liu, Yang He. Microstructure evolution in large billet during reduction pretreatment based on laboratory experiments[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2023, 30(6): 1244-1257. |
[2] |
Yu-xiao Liu, Yan-wu Dong, Zhou-hua Jiang, Yu-shuo Li, Wei Zha, Yao-xin Du, Shu-yang Du. XGBoost-based model for predicting hydrogen content in electroslag remelting[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2023, 30(05): 887-896. |
[3] |
Min Qi, Hong-yan Wu, Ying Dong, Lin-xiu Du. On hot deformation behavior and workability characteristic of 42CrMo4 steel based on microstructure and processing map[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2023, 30(03): 537-547. |
[4] |
Shao-jie Lv, Shui-ze Wang, Gui-lin Wu, Jun-heng Gao, Xu-sheng Yang, Hong-hui Wu, Xin-ping Mao. Application of phase-field modeling in solid-state phase transformation of steels[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2022, 29(6): 867-880. |
[5] |
Zhong-yi Chen, Zheng-zong Chen, Dong-xu Kou, Yong-qing Li, Yong-lin Ma, Yi-ming Li. Evolution of microstructure in reheated coarse-grained zone of G115 novel martensitic heat-resistant steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2022, 29(2): 327-338. |
[6] |
Fei Li, Li-wen Zhang, Chi Zhang, Kang-jie Song, Pei-gang Mao. Numerical simulation on recrystallization behavior and microstructure evolution during hot continuous rolling process of 38CrMoAl steel rod[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2022, 29(10): 1633-1645. |
|
|
|
|