Effect of grain growth in bimodal microstructure on cutting performance of self-toughening Dy-α-SiAlON ceramic tool inserts

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI:10.2298/pac2303321g

Beichen Gao, Weinila Abulaiti, Zheng Guan, Limeng Liu

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Abstract

Although significant increase in mechanical properties has been achieved in ?-SiAlON ceramics by introducing self-toughening bimodal microstructure, the bimodal microstructure may not always result in better cutting performance of ?-SiAlON tool inserts. Herein Dy-?-SiAlON ceramics were prepared by hot-pressing at 1900?C under 30MPa. Diameter and aspect ratio of the large elongated ?-SiAlON grains pivotal to formation of bimodal microstructures were regulated by using 0-5wt.% Dy2O3 as a sintering additive. Mechanical properties and cutting performance of ?-SiAlON tool inserts were evaluated. The results showed good Vickers hardness (19.0-19.7GPa) and fracture toughness (3.61-4.18MPa?m1/2) increasing with crack propagation length. However, transverse section of the large elongated grains was revealed as critical crack to cause premature fracture of the ?-SiAlON ceramics. Fracture rather than attrition wear was recognized as dominant mechanism for tool failure, indicating that for better cutting performance of the ?-SiAlON tool inserts a selftoughening microstructure consisting of thinner grains with large aspect ratio is required.

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双峰组织晶粒长大对自增韧Dy-α-SiAlON陶瓷刀具切削性能的影响

虽然通过引入自增韧双峰微观结构可以显著提高-SiAlON陶瓷的机械性能，但双峰微观结构并不一定能提高-SiAlON刀具刀片的切削性能。此处Dy - ?用热压法制备sialon陶瓷。温度在30MPa以下。在0-5wt的作用下，对双峰组织形成至关重要的大长条形-SiAlON晶粒的直径和长径比进行了调节。% Dy2O3作为烧结添加剂。对-SiAlON刀具刀片的力学性能和切削性能进行了评价。结果表明，随着裂纹扩展长度的增加，合金具有良好的维氏硬度(19.0 ~ 19.7 gpa)和断裂韧性(3.61 ~ 4.18 mpa ?m1/2)。然而，大伸长晶粒的横切面是导致陶瓷过早断裂的关键裂纹。断裂而非磨损磨损被认为是刀具失效的主要机制，这表明为了获得更好的切削性能，需要由大展径比的更薄晶粒组成的自韧组织。

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