Effect of grinding-induced cyclic heating on the hardened layer generation in the plunge grinding of a cylindrical component

paper discusses the effects of the grinding-induced cyclic heating on the properties of the hardened in a plunge cylindrical grinding process on the high strength steel EN26. It was found that a multigrinding brings about a uniform and continuous hardened layer along the circumference of the workpiece. An increase of the number of grinding passes, leads to a thicker layer of hardening, larger compressive residual stress and a deeper plastic deformation zone. Within the plastic dezone, the martensitic grains are refined by the thermo-mechanical loading, giving rise to a of 12.5% higher than that from a conventional martensitic transformation. The coupled effects heat accumulation and wheel wear in the multi-pass grinding are the main causes for the thickening the hardened layer. A too small infeed per workpiece revolution would result in insufficient grinding and in turn, bring about an undesirable tempered hardened layer and a reduction of its hardness. (C) 2014 Elsevier Ltd. All rights reserved.