Effect of the specimen shape on microstructure of the adiabatic shear band in bearing steel

LI Zhigang; LI Shuxin; YU Feng; LU Siyuan; WANG Yonggang

doi:10.11883/bzycj-2022-0357

Volume 43 Issue 4

Apr. 2023

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LI Zhigang, LI Shuxin, YU Feng, LU Siyuan, WANG Yonggang. Effect of the specimen shape on microstructure of the adiabatic shear band in bearing steel[J]. Explosion And Shock Waves, 2023, 43(4): 043103. doi: 10.11883/bzycj-2022-0357

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LI Zhigang, LI Shuxin, YU Feng, LU Siyuan, WANG Yonggang. Effect of the specimen shape on microstructure of the adiabatic shear band in bearing steel[J]. Explosion And Shock Waves, 2023, 43(4): 043103. doi: 10.11883/bzycj-2022-0357

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Effect of the specimen shape on microstructure of the adiabatic shear band in bearing steel

doi: 10.11883/bzycj-2022-0357

LI Zhigang^{1, 2
,},
LI Shuxin^{1, 2, 3
,
,},
YU Feng^{1, 2},
LU Siyuan^{1, 2, 3},
WANG Yonggang^{1, 2}

1.
Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
3.
Part Rolling Key Laboratory of Zhejiang Province, Ningbo 315211, Zhejiang, China

Received Date: 2022-08-16
Rev Recd Date: 2023-01-05

Available Online: 2023-02-14

Publish Date: 2023-04-05

Abstract

Abstract

The microstructure of adiabatic shear band (ASB) is influenced by the specimen geometric shape. High-speed impact tests were performed on specimens of three different shapes of cylinder, hat-shaped, and shear-compression by a split Hopkinson pressure bar, to study the effect of the specimen shape on the formation and microstructure of the adiabatic shear band in the bearing steel. The results show that at the strain rate from 1800 to 3100 s^-1, the flow stress remains almost the same with increasing the strain rate in three different shapes of sepcimens, indicating that the material shows low strain rate sensitivity. At high strain rates, the cylindrical specimen exhibits a strong strain hardening, while the hat-shaped specimen and the shear-compression specimen (SCS) show both strain hardening and no strain hardening features at different strain rates, but their flow stresses are not increased due to hardening effect. The fracture surface of the cylindrical specimen presents a large number of dense and tiny elliptical dimples. The number of dimples is greatly reduced on the hat-shaped specimen. The dimple, however, has a width that is twice of that of the cylindrical specimen. There is a distinct shearing path of carbides. In contrast, the SCS has even fewer but much larger dimples, with the width of 1.6 μm, twice of the hat-shaped specimen, and the shearing path of carbides reaches 7 μm. Local melting occurs on both the hat-shaped specimen and SCS, especially the SCS, a massive melting is displayed. A long and narrow ASB was produced in the cylindrical specimen, and only strain-induced grain refinement occurred in the ASB, which belongs to the deformed ASB. Large patch of ASBs is generated in the hat-shaped specimen and SCS. The ASBs consist of equiaxed grains and belong to the transformed ASB as the phase transformation from martensite to austenite occurred. In particular, the equiaxed grains in the ASB of the SCS have very clear grain boundaries, which are typical dynamic recrystallization grains. It can conclude that the shape of the specimen has a great influence on the microscopic morphologies and microstructures of ASB. The cylindrical specimen is in a typical compressive stress state, while the hat-shaped specimen and SCS are in complicated stress dominated by shear. The temperature rise int the ASB of the cylindrical specimen is much lower than the austenite transformation temperature, while it is higher than the melting point of martensite in the hat-shaped specimen and SCS, leading to local melting and microstructural change.
- bearing steel,
- adiabatic shear band (ASB),
- phase transformation,
- equiaxed grain

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References(26)

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