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Indexed by:期刊论文

Date of Publication:2012-01-15

Journal:Materials Science and Engineering A

Included Journals:EI

Volume:532

Page Number:111-119

ISSN No.:09215093

Abstract:This paper presents an in-depth investigation into the formation mechanisms and microstructures of adiabatic shear bands (ASBs) in hardened AISI 1045 steel induced by high speed machining (HSM). A systematic analysis, both experimentally and theoretically, shows that a low cutting speed leads to deformed ASBs, and a high cutting speed results in transformed ASBs. The formation mechanisms of the two types of ASBs are fundamentally different. A deformed ASB is simply due to severe plastic shear, but a transformed ASB involves a process of reorientation and elongation of the martensite laths in the hardened steel, and the partitioning of elongated subgrains. It was found that a dynamic rotational recrystallization is likely the origin of the equiaxed grains in the center of a transformed ASB. © 2011 Elsevier B.V.