Transactions of Materials and Heat Treatment

Title：Cause analysis of fracture for 301 stainless steel bolt

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ClassificationCode：TG142.1

year,vol(issue):pagenumber：2020,45(10):7-12

Abstract：

In order to find out the cause reason of 301 stainless steel bolt, the chemical compositions of bolt were analyzed by HORIBA GD Profiler 2 RF glow discharge spectrometer, and the fracture morphology and metallographic structure of bolt were observed by Zeiss ULTRA 55 field emission scanning electron microscope and AXioImager.M 2m optical microscope. Then, the typical inclusion composition in the bolt was analyzed by EDS, and the X-ray diffraction tests on the bolt head samples were conducted to analyze the phase composition of samples by PANalytical Empyrean X-ray diffractometer. The results show that the composition of bolt meets the requirements, and the edge of bolt section is intergranular fracture and the central rough part is ductile fracture. In addition, the martensitic transformation occurs in the deformation zone of bolt, the deformed austenite and martensite structure exist, and there is no sensitization phenomenon in the stainless steel bolt before cold deformation. Finally, comprehensive analysis of test results shows that

the martensite structure caused by cold deformation and the hydrogen embrittlement caused by stress corrosion in seawater are the two main reasons for the fracture of 301 stainless steel bolt. Thus, it is necessary to improve the process in the subsequent production to avoid martensite structure in the steels.

Funds：

闫志波（1965-），男，硕士，副教授 E-mail：sjzpt2010@163.com

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