Author(s)

H. Berns, K. Segtrop & W. Theisen

Abstract

Surface integrity of hard alloys after machining using PCBN H. Berns, K. Segtrop, W. Theisen Lehrstuhl Werkstofftechnik,. Ruhr - Universitdt Bochum, 4&30 Bochurn, Germany ABSTRACT Turning tests on Co- and Fe- Base hardfacing alloys brought about that even hyper- and hypoeutectic alloys can be machined using CBN as the tool material. The flank wear of the cutting tool is mainly governed by the cutting speed and feed rate showing a minimum at a certain value. The most important factors for the state of the surface and the subsurface are the cutting temperature (generated the cutting process) and the constituents of microstructure. At high temperatures carbides are plastically deformed while at lower temperatures a decohesion between the carbides and the matrix is found. The quality of of a turned surface is comparable to a ground one, if optimal cutting parameters are choosen. INTRODUCTION The quality of a machined surface is becoming more and more important to satisfy the

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