Relation Between Stress Relief Cracking and Metallurgical Properties of Low Alloy Steels

概要

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Heat-affected zone cracking due to stress relief heat treatment has been investigated in a wide variety of ferritic steels. This investigation was undertaken to prove the relationship between this type of cracking and metallurgical and mechanical properties. 1. It is necessary for cracking that the structure should be in quenched state and coarse grained before stress relieving, i.e. this cracking will not occur in the over aged structure or in the fine grain structure. 2. When this cracking dccurs ouring stress-relieving, it is always accompanied by the formation of fine intragranular precipitates, leading to enhanced stress concentration at the three grain junction. 3. The stress-relief cracking susceptibility of a steel can be described by ⊿G=[Cr]+3.3[Mo]+8.1[V]-2 and when ⊿G is positive the steel is susceptible. 4. The macroscopic behavior is in a good agreement with and confirmed by the microscopic observations.
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