Stress Relief Cracking in Heat Affected Zone (Report 2):Observation of Initiation and Development of Cracking

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• The inition and development of the heat-affected zone cracking in a T-1 type steel during stress relief heat treatment were obsrved under the high-temperature microscope, and furthermore studied by means of electric resistivity method.<BR>The results indicate that sliding at a grain boundary occurs prior to cracking during the stress relief heat treatment and that the crcak originates at a three grain junction and propagates from the junction along one of the grain boundaries at the triple point developing into an extensive in-terbrystalline cracking.

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