The following points are introduced in order as concerned to reheat cracking sensitivity and crack producing mechanism. i)Reheat cracking sensitivity of various Cr-Mo steels was quantitatively compared using critical stress for producing cracking (ÓAW-crit). ⅱ)There was a chemical composition field in which cracking sensitivity is very high (Field Ⅲ). ⅲ)In such the field, M₂C carbide generally precipitates. It will play an important role to produce the cracking. ⅳ)But the grain strengthening effect of M₂C was not so much decisive to crack formation, as was expected from the precipitation hardening hypothesis. ⅴ)Then the authors propose a new type of phosphorus-embrittling hypothesis which can explain the mechanism of phosphorus segregation caused mainly by M₂C precipitation.
雑誌名
Research reports of the Faculty of Engineering, Mie University
Consideration on the Mechanism of Reheat Cracking of Cr-Mo Steels : Mechanism of Grain Boundary Embrittlement by Carbide Precipitation
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