Carbon enriched defect and the associated deformation cracking behaviors in a titanium alloy

ZHENG Youping; WANG Liya; QIN Haixu; GENG Naitao; LI Lu; CHEN Wei

doi:10.7513/j.issn.1004-7638.2025.01.007

Volume 46 Issue 1

Feb. 2025

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ZHENG Youping, WANG Liya, QIN Haixu, GENG Naitao, LI Lu, CHEN Wei. Carbon enriched defect and the associated deformation cracking behaviors in a titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 45-52. doi: 10.7513/j.issn.1004-7638.2025.01.007

Citation:

ZHENG Youping, WANG Liya, QIN Haixu, GENG Naitao, LI Lu, CHEN Wei. Carbon enriched defect and the associated deformation cracking behaviors in a titanium alloy[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(1): 45-52. doi: 10.7513/j.issn.1004-7638.2025.01.007

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Carbon enriched defect and the associated deformation cracking behaviors in a titanium alloy

doi: 10.7513/j.issn.1004-7638.2025.01.007

ZHENG Youping^{1, 2
,},
WANG Liya^{1, 2},
QIN Haixu^{1, 2},
GENG Naitao^{1, 2},
LI Lu³,
CHEN Wei³

1.
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
2.
Titanium Metal Technology Department of Chengdu Advanced Metal Materials Industrial Technology Research Institute Co., Ltd., Chengdu 610399, Sichuan China
3.
Pangang Group Jiangyou Changcheng Special Steel Co., Ltd., Jiangyou 621704, Sichuan, China

Received Date: 2024-06-27
Publish Date: 2025-02-27

Abstract

Abstract

Since the contacting ultrasonic detection results indicated some defects existed in a bar of Ti-6Al-4V alloy, researching work had been carried out using optical microscope, scanning electron microscope metallographic analysis, microhardness, energy spectrum, electron probe, backscatter electron diffraction and other characterization methods. And uncommon carbon enriched defect had been figured out. Flecks surrounded with α stable area were observed in the microstructure. Then, it was figured out that flecks were Ti₂C with ordered FCC crystal and the α stable area was hard α phase based on the chemical composition and crystallology analysis. According to the distribution characteristics of chemical elements, the defect source was presumed to be raw materials contaminated by elements rich in carbon and nitrogen. Micro cracks initiated at Ti₂C/α boundaries and grew into the α side in the hard α and Ti₂C regions during the forging. Micro cracks would break through the Ti₂C crystal bridges and merged into ultrasonically detectable macro crack defects at last.
- carbon enriched defect,
- hard α phase,
- Ti₂C,
- grain bridge

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References(15)

References

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