Cutting performances and the related characteristics of CVD coated hardmetal inserts changed by post-treatments

A TiN/MT-TiCN/α-Al2O3/TiN coating is deposited on a WC–6Co hardmetal substrate by chemical vapor deposition (CVD). The influence of the post-treatments after the CVD process on the performances of the inserts in the tuning of grey cast iron EN-GJL-250 and the related characteristics are investigated...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2018-01, Vol.70, p.162-168
Main Authors: Zhong, Zhi-Qiang, Zhang, Li, Zhou, Lei, Qiu, Lian-Chang, Shi, Hai-Dong, Yang, Man-Li, Zhu, Ji-Fei
Format: Article
Language:English
Subjects:
Adhesion
Adhesive strength
Aluminum oxide
Blasting
Cast iron
Cemented carbide
Chemical vapor deposition
Coating
Compressive properties
Compressive strength
Cooling effects
Cutting parameters
Cutting performance
Cutting wear
Inserts
Metals
Micro crack healing
Microcracks
Organic chemistry
Polishing
Post-treatment
Residual stress
Substrates
Surface finish
Surface roughness
Titanium carbonitride
Tool life
Tool wear
Tungsten carbide
Work hardening
Workpieces
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Summary:A TiN/MT-TiCN/α-Al2O3/TiN coating is deposited on a WC–6Co hardmetal substrate by chemical vapor deposition (CVD). The influence of the post-treatments after the CVD process on the performances of the inserts in the tuning of grey cast iron EN-GJL-250 and the related characteristics are investigated. Conventional brushing, polishing and wet-blasting are employed for the comparison. The results demonstrate that the coated inserts post-treated by wet-blasting followed by polishing exhibit in a cost effective way the lowest surface roughness, the best combination of cooling micro-crack healing effect and surface finish state, a moderate compressive stress state, and >100N adhesion strength. As a result, in the wet cutting condition, the lowest roughness and the smallest work hardening value of the workpieces compared at a fixed time parameter in their middle-later cutting lifetime and the longest tool life are attained. Crater wear developed from adhesive wear is the main reason for the tool failure. The same tool life conclusion is reached in the dry cutting condition. •Cutting performances of CVD coated inserts with 4 post-treatment states are compared.•Cutting performances related characteristics are compared.•Wet-blasting followed by polishing exhibit the best results in a cost effective way.•Intrinsic relation between cutting performances and other characteristics is revealed.•The results are ready for industrial applications.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2017.10.003