Study on transformation behavior of ultra-high strength steel for construction machinery

Zheng Dongsheng; Fan Caihe; Hu Zeyi; Sun Yaxin; Luo Deng; Liu Dan; Zhang Qingxue

doi:10.7513/j.issn.1004-7638.2022.06.020

Volume 43 Issue 6

Jan. 2023

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2022 > 43(6): 138-142

Zheng Dongsheng, Fan Caihe, Hu Zeyi, Sun Yaxin, Luo Deng, Liu Dan, Zhang Qingxue. Study on transformation behavior of ultra-high strength steel for construction machinery[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 138-142. doi: 10.7513/j.issn.1004-7638.2022.06.020

Citation:

Zheng Dongsheng, Fan Caihe, Hu Zeyi, Sun Yaxin, Luo Deng, Liu Dan, Zhang Qingxue. Study on transformation behavior of ultra-high strength steel for construction machinery[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 138-142. doi: 10.7513/j.issn.1004-7638.2022.06.020

Citation:

Zheng Dongsheng, Fan Caihe, Hu Zeyi, Sun Yaxin, Luo Deng, Liu Dan, Zhang Qingxue. Study on transformation behavior of ultra-high strength steel for construction machinery[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(6): 138-142. doi: 10.7513/j.issn.1004-7638.2022.06.020

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Study on transformation behavior of ultra-high strength steel for construction machinery

doi: 10.7513/j.issn.1004-7638.2022.06.020

1.
College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 412007, Hunan, China
2.
Technology and Quality Department, Xiangtan Iron and Steel Co., Ltd., Hunan Iron and Steel Group, Xiangtan 411101, Hunan, China

Received Date: 2022-03-31
Publish Date: 2023-01-13

Abstract

Abstract

Transformation behavior of Cr-Mo-Ni-B ultra-high strength steel for construction machinery under continuous cooling condition was studied by means of MMS-200 thermomechanical simulator. The effect of cooling rate (0.5~40 ℃/s) on its transformation temperature and microstructure was analyzed by thermal dilatometry curves, optical microscopy (OM) and scanning electron microscopy (SEM). The results show that transformation temperatures of B_s, B_f, M_s and M_f decrease and phase transformation at medium and low temperature is promoted with the increase of cooling rate. As the cooling rate is below 2 ℃/s, pearlite and bainite transformations occur. Mixture microstructure of granular bainite and lath martensite is observed when cooling rate is in range of 2 ℃/s and 5 ℃/s. As the cooling rate is above 5 ℃/s, granular bainite disappears and fully martensitic microstructure is obtained. In the formation temperature range of medium and low temperature transformation microstructure, the morphology, size and quantity of M/A islands as well as width of martensite lath are influenced significantly by cooling rate. With the increase of cooling rate, the morphology of M/A islands is modified from blocky shape into granular shape, their size decreases and the volume amount increases. The average width of the martensite lath decreases as a result of increasing the cooling rate.
- ultra-high strength steel for construction machinery,
- transformation behavior,
- cooling rate,
- microstructure

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References(18)

References

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