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Chromium Molybdenum Steel Brittle Tendency Is Large, Easy To Produce Delay Crack
- Aug 18, 2018 -

The addition of chromium, aluminum, vanadium and other alloy elements reduces the critical cooling rate of steel and improves the stability of supercooled austenite.If the welding cooling rate is fast, the austenite transformation to perlite will not occur in the over-heat zone of the heat affected zone, and the austenite transformation to martensite transformation will occur at lower temperature to form the hardened tissue.Due to the complex residual stress and diffused hydrogen, the hygrogenic delay crack can be easily produced in the weld area and the hot area