Study on Thermal Deformation Behavior and Mechanism of Difficult-to-process Boron-containing Stainless Steel

Li Yongwang; He Xueyi; Wang Xinmin; Guo Zhen; Wu Yu; Liu Haitao

doi:10.13832/j.jnpe.2022.S2.0067

Volume 43 Issue S2

Dec. 2022

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Li Yongwang, He Xueyi, Wang Xinmin, Guo Zhen, Wu Yu, Liu Haitao. Study on Thermal Deformation Behavior and Mechanism of Difficult-to-process Boron-containing Stainless Steel[J]. Nuclear Power Engineering, 2022, 43(S2): 67-73. doi: 10.13832/j.jnpe.2022.S2.0067

Citation:

Li Yongwang, He Xueyi, Wang Xinmin, Guo Zhen, Wu Yu, Liu Haitao. Study on Thermal Deformation Behavior and Mechanism of Difficult-to-process Boron-containing Stainless Steel[J]. Nuclear Power Engineering, 2022, 43(S2): 67-73. doi: 10.13832/j.jnpe.2022.S2.0067

Citation:

Li Yongwang, He Xueyi, Wang Xinmin, Guo Zhen, Wu Yu, Liu Haitao. Study on Thermal Deformation Behavior and Mechanism of Difficult-to-process Boron-containing Stainless Steel[J]. Nuclear Power Engineering, 2022, 43(S2): 67-73. doi: 10.13832/j.jnpe.2022.S2.0067

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Study on Thermal Deformation Behavior and Mechanism of Difficult-to-process Boron-containing Stainless Steel

doi: 10.13832/j.jnpe.2022.S2.0067

1.
Institute of Nuclear Composite Element and Material, Nuclear Power Institute of China, Chengdu, 610213, China
2.
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

Received Date: 2022-08-23
Rev Recd Date: 2022-10-10
Publish Date: 2022-12-31

Abstract

Abstract

The solid solubility of boron in steel is low, and a large number of coarse, hard and brittle eutectic borides are easily formed in the solidification process of Boron-containing stainless steel prepared by fusion casting, which leads to poor hot processibility of its billets. In order to solve this problem, using 18.5Cr-14.0Ni-2.1B stainless steel as the research material, the single-pass hot compression experiment was carried out on a thermal simulation machine, the flow stress constitutive equation was established, the hot processing map was constructed, the reasonable processing window of the stainless steel was defined, and the thermal deformation behavior and mechanism of boron-containing stainless steel were revealed. The results show that the apparent thermal deformation activation energy Q and stress exponent n of 18.5Cr-14.0Ni-2.1B stainless steel are 501.08 kJ·mol⁻¹ and 8.13 respectively; In the process of hot compression, eutectic borides are mainly broken, rotated and induced to form a large number of micropores, most of which can be filled by the plastic flowing austenitic matrix; The larger the strain of the hot compression process is, the smaller the processing window is. When the 18.5Cr-14.0Ni-2.1B boron-containing stainless steel is deformed at 1000~1100℃ and at the rate of 0.01~1.0 s⁻¹, it shows good processibility.
- Boron-containing stainless steel,
- Thermal deformation,
- Constitutive equation,
- Hot processing map

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References(17)

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