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堆高機機油幫浦固定螺絲 疲勞斷裂(海灘紋特徵 清晰可見), 沒有了潤滑油的供應. 相關引擎零件整體燒壞報銷.
Crack initiation site shows cluster of inclusion particles. 夾雜物顆粒群聚 材料缺陷對此疲勞破裂也有貢獻
上: 右側較平坦處為未固溶肥粒鉄, 代表:表面的感應淬火, 加熱時間有一點太短 (under heating)算是熱處理瑕疵.下: 心部放大4000x 才看得清楚的微細波來鉄(經正常化所得). Above: Undisolved Ferrite islands are found near surface, indicating this part was slightly under-heated during induction hardening.
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