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不良・失敗
anneal crack
Japanese: アニールクラック
Cracks that develop later due to insufficient slow cooling; cracks caused by residual stress.
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An anneal crack is a phenomenon in which a material cracks at a later date due to internal residual stresses that have become locked in as a result of insufficient slow cooling. The material does not crack immediately after firing; instead, it may crack spontaneously several hours to several days later.
Prevention involves holding the material at the slow-cooling point for a sufficient duration and cooling it gradually to the strain point.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.