Stress Relief Cracking in Heat-Affected Zone (Report 3):The relation betwees the cracking and metallurgical properties of low alloy steels

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Heat-affected zone cracking due to stress relief heat treatment has been investigated on a wide variety of ferritic steels. This investigation was undertaken to prove the relationship between this type of cracking and the metallurgical and mechanical properties. 1) It is necessary for cracking to occur that the structure is in quenched state and coarse grained before stress relieving, i.e. this cracking may not occur in an overaged structure or in a fine grain structure. 2) When this cracking occurs during 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 ΔG=[Cr]+3.3[Mo]+8.1[V]-2 such that when ΔG 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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