Open AccessPhysical Properties and Failure Analysis for Bolts in the Diaphragm Valve by Micro Morphology and Metallographic Test
Author(s) -
Dungui Zuo,
Zhongwei Zhang,
Yunting Lai,
Guodong Zhang
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2083/2/022103
Subject(s) - intergranular corrosion , materials science , metallurgy , corrosion , crevice corrosion , cracking , valve seat , fracture (geology) , diaphragm (acoustics) , composite material , vibration , engineering , mechanical engineering , physics , quantum mechanics
The reasons leading to the fracture of 17-4PH stainless steel bolts in the isolation valve of a power plant was analysed by means of morphology analysis, chemical analysis, hardness test, metallographic test, pitting corrosion test and intergranular corrosion test, SEM and other detection means. The results show that there are many corrosion pits on the surface of the valve stem in the seawater system, the corrosion pits is extend and propagation in intergranular cracking. The main reasons to valve stem fracture are the low corrosion resistance of the material and the improper aging process of heat treatment.