Analysis of the Machining Conditions of Aeronautical Parts Made from 15-5 PH Stainless Steel Subjected to H1150 Heat Treatment

Objective: To investigate the influence of H1150 heat treatment on 15-5 PH steel, analyzing its implications for tool life and the feasibility of eliminating the roughing step by machining already heat-treated blocks with coated solid carbide endmills. Theoretical Framework: This research is grounded in the properties of precipitation hardening stainless steels, known for high mechanical strength and challenging machinability. It explores how H1150 treatment impacts tool wear during milling. Method: This study compared the milling of as received versus H1150 heat-treated 15-5 PH blocks using coated solid carbide endmills with constant parameters. Flank wear was measured, and a two-sample t-test determined statistical significance. Results and Discussion: The maximum flute wear (VBmax) difference between the heat-treated and non-treated groups was statistically significant (p = 0,0129), with the treated block causing greater wear on the tool's most critical flute. The difference in average wear across all flutes, however, was not statistically significant (p = 0,1918). Research Implications: These results impact the aeronautical industry’s goal of operational efficiency. While machining post-treatment is feasible, accelerated critical wear affects tool life, which is directly linked to reducing production costs and time. Originality/Value: This study contributes to process optimization by providing quantitative data on machining hardened 15-5 PH steel. Its value is in assessing the trade-offs of eliminating a roughing operation to increase industrial competitiveness.