Experimentation on AISI T42 tool steel at very low temperature

Abstract

Cryogenic Treatment is one of the heat treatment processes, which is used to develop the wear resistance property of tool material and remove residual stresses in Tool steels for better machining performance. This paper focuses on cryogenically treated T42 tool performance on mild steel as workpiece material. For investigating the machining performance, the responses considered in this work are machining time, surface roughness, thrust force, feed force, cutting force and MRR with the independent variables of spindle speed, feed rate and depth of cut. The design of Experiment concept is utilized for conducting the experiments with L27 orthogonal array. The significant independent variables on considered responses are identified through ANOVA Table. The Effect of independent variables over responses has been found by the Response surface plot based on the identified significant parameters the empirical model is built with the aid of regression analysis. After prediction, the validation of the developed model is conducted with experimental data. The developed models are having less percentage of deviation with experimental data like Machining time -16.48%, surface roughness -0.14%, Thrust force -5.61%, Feed force -31.27%, Cutting force -15.50%, and MRR -0.11%. Hence, these models can be used to navigate independent variables’ values on responses within the range of independent variables considered for the experiments.

Keywords

• AISI T42
• Low temperature
• Cryogenic treatment
• Hardness
• Surface finish