It has been analysed the causes for the heavy surface spalling of back-up roll for a finishing mill. The result shows that the main causes are gas hole, shrinkage and bad heat treatment.
对连轧机精轧支承辊大面积剥落的原因进行了深入的分析，结果表明，轧辊内部的缩孔、气泡及热处理不当是造成轧辊表面剥落的主要原因。
Cracks leading to spalling were initiated at surface defects and boundaries between nitriding layes and the core.
导致剥落的疲劳裂纹开始于表面缺陷和氮化层与心部交界处。
Reflective crack caused surface cracking, spalling, surface water infiltrating along the seam, so that the road was damaged.
反射裂缝导致面层开裂、剥落，路面水沿裂缝下渗，使路面发生损坏。
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