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Towards understanding plastic deformation in hardmetal turning inserts with different binders
International Journal of Refractory Metals & Hard Materials ( IF 3.6 ) Pub Date : 2020-09-04 , DOI: 10.1016/j.ijrmhm.2020.105309
L. Toller-Nordström , J. Östby , S. Norgren

This works investigates the deformation of coated hardmetal turning inserts used until the end of life. Three hardmetals with different binder phases, pure cobalt, 15 wt% iron 85 wt% nickel and 85 wt% iron 15 wt% nickel are tested. It is shown that grain boundary sliding accommodated by formation of binder phase lamellae is present in all tested inserts, given by a clear increase in number of lamellae in the microstructure of a tested cutting edge compared to a pristine cutting edge of the same material. The lamellae formation is discussed and can be explained by the stresses experienced by the cutting edge during turning. In addition the importance of good coating adhesion was shown by formation of cavities in inserts that experienced flaking of the coating.



中文翻译:

理解具有不同粘合剂的硬质合金车削刀片中的塑性变形

这项工作研究了直到使用寿命结束时所使用的涂层硬质合金车削刀片的变形。测试了三种具有不同粘合剂相的硬金属,纯钴,15 wt%的铁,85 wt%的镍和85 wt%的铁15 wt%的镍。结果表明,与所有材料相比,与原始材料相比,在测试的切削刃的微观结构中,薄片的数量明显增加,这说明在所有测试的刀片中均存在着形成粘结相薄片的晶界滑动。讨论了薄片的形成,并可以通过车削时切削刃承受的应力来解释。另外,通过在经历了涂层剥落的插入物中形成空腔来显示良好的涂层粘附性的重要性。

更新日期:2020-10-17
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