Performance evaluation of coated tool in end milling of XH67MBTHO alloy

ABSTRACT

XH67MBTHO is a promising nickel-based alloys which finds applications in aerospace engineering due to its exceptional hot hardness, corrosion resistance and strength at superior temperatures. However, due to its weak thermal conductivity(k=13.4W/mK) and high tendency to work harden, XH67MBTHO exhibits poor machinability. Therefore, the major objective of this study is to investigate the machinability characteristics of XH67MBTHO, using TiAlN coated milling inserts at three levels of speed, feed, and axial depth of cut. Significant parameters affecting responses were identified using ANOVA. SEM and EDS analysis of worn-out tool shows delamination, adhesion, abrasion and diffusion were major tool wear mechanism. Also, as machining conditions shift from higher to lower, tool life increases to 1200 seconds from 49.18 seconds and surface roughness decreases from 0.52 µm to 0.18 µm respectively. Also, a regression and Artificial Neural Network model were developed to predict the process response in terms of input parameters.

KEYWORDS:

• -XH67MBTHO
• end milling
• tool wear
• built up layer
• chip morphology

Acknowledgments

Authors were thankful to DST, Govt. of India, in providing facilities to do trial runs, on “FIST” scheme (SR/FST/ETI 388/2015). Authors also thank Indian Space Research Organization (ISRO) Organization for providing funding assistance under Respond Scheme (ISRO-RES/3/889/21-22) for completing the present study. Also, authors would like to thank Dr P B Dhanish from NIT Calicut, Mr. George Oommen and Mr. Anoop C R from ISRO for successful implementation of objectives.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported by the Indian Space Research Organisation under their respond basket scheme (ISRO-RES/3/889/21-22).