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论文类型：期刊论文

发表时间：2016-08-01

发表刊物：JOURNAL OF MATERIALS PROCESSING TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：234

页面范围：208-216

ISSN号：0924-0136

关键字：High-speed machining; Adiabatic shear; Serrated chip; Fracture; Quick-stop test

摘要：The serrated chip produced in high-speed machining of martensitic precipitation-hardening stainless steel is inevitably tore up into isolated segments due to adiabatic shear fracture with the further increase of cutting speed. The induced mechanism of adiabatic shear fracture and the corresponding damage process in high-speed machining are investigated through quick-stop tests and chip morphology examinations. The isolated segments generated due to adiabatic shear fracture which is found in the rate-related process of adiabatic shear evolution is a cyclic process of energy convergence and release with ductile brittle damage transition. The fracture energy of adiabatic shear band approaches a stable saturation limit with the increases of cutting speed and feed. On the basis of saturation limit model, the critical fracture energy is predicted by cutting conditions and compared with the experimental results. (C) 2016 Elsevier B.V. All rights reserved.