close
鑄造方案設計不良(未顯現出來), 導致頂面上產生微縮孔. 微縮孔是疲勞破裂起裂(crack initiation)原因. 需從鑄造方案改正. Poor risering design led to micro-shrinkage pores on top surface of piston. These micro pores served as crack initiation sites for the thermal fatigue cracking.
皮下的微縮孔 與大氣是相通的.
below: beach marks. Red arrows: direction of crack growth. yellow arrows: micro- pores.
下: 頂面上的微縮孔群
全站熱搜
留言列表
