Science Links Japan | Study on Crack Propagation Behavior of Cermets and Cemented Carbides under repeated Thermal Shocks due to the improved quench test.

Study on Crack Propagation Behavior of Cermets and Cemented Carbides under repeated Thermal Shocks due to the improved quench test.

Accession number;00A0690223

Title;Study on Crack Propagation Behavior of Cermets and Cemented Carbides under repeated Thermal Shocks due to the improved quench test.

Author; YOSHIMOTO TAKASHI (Nachi-Fujikoshi Corp.)

Journal Title;Fujikoshi Engineering Review

Journal Code:F0439A

ISSN:0429-8349

VOL.56;NO.1;PAGE.56-59(2000)

Figure&Table&Reference;FIG.36, TBL.8, REF.33

Pub. Country;Japan

Language;Japanese

Abstract;In order to deverop a good cutting tool, it is necessary to study basically the thermal shock behavior of the tool material. So that in this study crack propagation behavior under repeated thermal shocks was studied on cermets and cemented carbides for cutting tools. The results thus obtained were summarized as five chapters. Firstly an improved quench testing method that would enable us to estimate crack propagation behavior and fracture toughness values under repeated thermal shocks as a characteristics of material has been proposed. Nextly it was clarified that this method would enable us to give quantitatively crack propagation behavior under repeated thermal shocks as a relationship between the crack propagation rate and the maximum stress intensity factor. Then this difference was discussed from the viewpoint of their microstructures. Lastly about cermets contained different amount of TiN, the relationship between cutting speed and crack growth vehavior of tool tips has been estimated by practising a milling test whose damages of tool tips would be most strongly influenced thermal shocks. Then it has been shown that an analysis by this proposed quenching method would proved a practical cutting phenomenon. (author abst.)

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