rolling crack

The results showed that capillary crack was formed from the surface cavity of billet in the process of high temperature heating-rolling and cavity and sliver defects were formed due to part melting of seating face of heavy rail.

分析结果表明：发纹缺陷是由方坯表面气孔经高温加热-轧制演变成的，掉肉和小裂口则是因重轨踏面局部融熔所造成的。

The longitudinal surface crack on thin slab is a serious quality defect casting and rolling process.

薄板坯表面纵裂是连铸连轧生产线上的严重质量缺陷.

The rolling contact fatigue life was found to be markedly related the subsurface crack propagation angle.

理论分析和试验结果表明,接触疲劳寿命与次表面裂纹扩展角之间存在着明显的对应关系.

Large quantity of rejected products involving edge crack and strip breakage are prone to occur in hot and cold rolling of the oriented silicon steel sheets due to high brittleness of the steel caused by its high silicon content.

取向硅钢含硅量高，钢质脆性大，在热轧和冷轧过程中容易产生大量边裂及断带轧废。

The accurate calculation of stress field based on EHL theory and theory of elasticity showed that the shear stresses at surface in direction of 30 ° with rolling direction cause the pitting cracks and the tensile stresses accelerate the crack growth.

结果表明：预加拉应力使裂纹起源于表面的点蚀寿命缩短，与滚动方向成30°角的剪应力是引起点蚀的决定应力。