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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Ratcheting short crack behavior in medium carbon bainitic back-up roll steel under mild tractive rolling contact
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Ratcheting short crack behavior in medium carbon bainitic back-up roll steel under mild tractive rolling contact

机译：中碳贝氏体备用轧制钢在轻度牵引轧制下的棘轮短裂纹行为

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摘要

In order to improve the current grinding procedure of the back-up roll of CVC hot rolling mills, the ratcheting short crack propagation behavior of medium carbon bainitic back-up roll steel was experimentally investigated under its actual work conditions, and the mechanism was theoretically analyzed based on contact mechanics and shakedown theory. After nucleation, the ratcheting short cracks propagate by the shear growth mechanism driven by the plastic strain accumulation resulting from the process of ratcheting induced by repetitive asperity contacts. They arrest on reaching the maximum depth ranging from 1.6 to 4.5 μm due to the presence of a large "quiescent zone" for crack propagation under the depth at which the maximum orthogonal shear stress is equal to the shear yield strength. At about 70-80% of the surface distress life, the cracks resume propagating by turning parallel to contact surfaces because of the greatly enhanced effect of the lubricant fluid trapped due to the crack geometry change and the residual tensile stress in vertical direction occurring upon unloading due to plastic deformation in the thin surface layer induced by the high cyclic asperity contact stresses. According to the ratcheting short crack propagation behavior and its mechanism, the probable grinding interval and grinding depth were proposed based on the preventive grinding strategy.
机译：为了改善CVC热轧机支承辊的现行磨削工艺，对中碳贝氏体支承辊钢在实际工作条件下的棘轮短裂纹扩展行为进行了实验研究，并对其机理进行了理论分析。基于接触力学和安定理论。成核后，棘齿形短裂纹通过剪切增长机制传播，该剪切增长机理是由重复的粗糙接触引起的棘齿过程引起的塑性应变累积驱动的。由于在最大正交剪应力等于剪切屈服强度的深度下存在一个大的“静态区”，用于裂纹扩展，它们在达到1.6至4.5μm的最大深度时会停止。在大约70-80％的表面遇险寿命时，由于平行于接触面转动，裂纹恢复了传播，这是由于裂纹的几何形状变化以及卸载时在垂直方向上残留的残余拉应力导致的截留的润滑剂流体的作用大大增强了。由于高循环粗糙接触应力引起的薄表面层的塑性变形。根据棘齿的短裂纹扩展行为及其机理，基于预防性磨削策略，提出了可能的磨削间隔和磨削深度。

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