Rheological behaviours and constitutive models of 9Cr18Mo stainless steel at high temperature and high strain rate

Jia Haishen; Shen Jiancheng; Luo Wencui; Yi Xiangbin

doi:10.7513/j.issn.1004-7638.2023.05.024

Volume 44 Issue 5

Oct. 2023

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Jia Haishen, Shen Jiancheng, Luo Wencui, Yi Xiangbin. Rheological behaviours and constitutive models of 9Cr18Mo stainless steel at high temperature and high strain rate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 158-166. doi: 10.7513/j.issn.1004-7638.2023.05.024

Citation:

Jia Haishen, Shen Jiancheng, Luo Wencui, Yi Xiangbin. Rheological behaviours and constitutive models of 9Cr18Mo stainless steel at high temperature and high strain rate[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(5): 158-166. doi: 10.7513/j.issn.1004-7638.2023.05.024

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Rheological behaviours and constitutive models of 9Cr18Mo stainless steel at high temperature and high strain rate

doi: 10.7513/j.issn.1004-7638.2023.05.024

1.
Key Laboratory of Green Cutting Technology and Application in Gansu Province, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China
2.
Gansu Provincial Precision Machining Technology and Equipment Engineering Research Center, Lanzhou Institute of Technology, Lanzhou 730050, Gansu, China

Received Date: 2022-05-25
Available Online: 2023-11-04
Publish Date: 2023-10-31

Abstract

Abstract

The compression tests of 9Cr18Mo stainless steel were conducted by using the UTM5305 universal testing machine and the split Hopkinson pressure bar (SHPB) test device. In this way, the stress–strain curves pertaining to quasi-static (strain rate: 0.001-0.1 s⁻¹) and dynamic (temperature: 25-650 ℃ and strain rate: 800-4000 s⁻¹) states were attained. According to the stress-strain curves, the rheological behaviours of 9Cr18Mo stainless steel at high temperature and high strain rate were discussed. Based on the testing data, the parameters of two constitutive models (Johnson-Cook (J-C) and Power-Law (P-L)) of 9Cr18Mo stainless steel were identified, and the correlation coefficients (R) and average absolute relative errors (AAREs) of the two constitutive models were compared. The results showed that 9Cr18Mo stainless steel presents strain rate sensitivity and significant thermal softening. That is the flow stress of 9Cr18Mo stainless steel increases with strain rate while significantly decreases with increasing temperature. The R values are 0.9697 and 0.9896, while the AAREs of two constitutive models are 2.77% and 1.85%, respectively. Hence, the P-L constitutive model shows a higher prediction accuracy which can describe the rheological behaviours of 9Cr18Mo stainless steel at high temperature and high strain rate more precisely compared with the J-C constitutive model.
- 9Cr18Mo stainless steel,
- rheological behavior,
- constitutive model,
- correlation coefficient,
- average relative error

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References(21)

References

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