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| THE CHARACTERISTICS OF GRAIN BOUNDARIES AND INTERGRANULAR STRESS CORROSION CRACKING OF 30Cr3SiNiMoWV ULTRA—HIGH STRENGTH STEEL |
| Li Guangfu Wu Rengen Lei Tingquan (Harbin Institute of Technology) |
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Cite this article:
Li Guangfu Wu Rengen Lei Tingquan (Harbin Institute of Technology). THE CHARACTERISTICS OF GRAIN BOUNDARIES AND INTERGRANULAR STRESS CORROSION CRACKING OF 30Cr3SiNiMoWV ULTRA—HIGH STRENGTH STEEL. J Chin Soc Corr Pro, 1990, 10(1): 15-21.
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Abstract The characteristics of prior austenitic grain boundaries in tempered martensitic microstructure in relation to intergranular stress corrosion cracking of 30Cr3SiNiMoWV ultra-high strength steels were investigated mainly with Auger electron spectroscopy.The results showed that carbon and phosphorus segregated apparently at the grain boundaries.There is a very thin layer of carbide at the carbon enriched grain boundaries, where segregated phosphorus distributes randomly.The basic reason why this steel is susceptible to intergranular stress corrosion cracking is that the interface between the carbide layer and the matrix provides a strong trap for hydrogen and promotes the localization of anodic dissolution, while phosphorus hinders the formation of hydrogen molecules from hydrogen atoms.
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Received: 25 February 1990
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