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2 2016

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The effect of aging on machinability of 15Cr–5Ni precipitation hardened stainless steel

Palanisamy D., Senthil P., Senthilkumar V.

Archives of Civil and Mechanical Engineering

2016

Vol. 16, no. 1

53--63

This study is an attempt to correlate the microstructure and mechanical properties of commercial 15Cr–5Ni precipitation-hardening stainless steel in different aging regimes such as solution treated (Condition A), over-aged (Condition H1150-M) and peak-aged (Condition H900) with their machinability behavior. Aging was done on 15Cr–5Ni precipitation-hardenable stainless steel samples in a temperature range of 480–760 °C. Over aging of the above material resulted in an improvement of ductility and a substantial reduction in tensile strength. Heat treated samples were machined in order to study the effects of machining parameters on machinability aspects such as cutting forces, surface roughness, chip morphology and tool wear. Experimental investigation revealed a strong correlation between the rate of cooling after aging and cutting forces. Air cooled samples exhibited higher cutting forces compared to furnace cooled samples. The surface finish is found to be improved for H900 air cooled sample, which has higher hardness than that of as received sample and H1150-M condition.

Optimization on turning parameters of 15-5PH stainless steel using Taguchi based grey approach and TOPSIS

Palanisamy D., Senthil P.

Archive of Mechanical Engineering

2016

Vol. LXIII, nr 3

397--412

The machinability and the process parameter optimization of turning operation for 15-5 Precipitation Hardening (PH) stainless steel have been investigated based on the Taguchi based grey approach and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). An L27 orthogonal array was selected for planning the experiment. Cutting speed, depth of cut and feed rate were considered as input process parameters. Cutting force (Fz ) and surface roughness (Ra) were considered as the performance measures. These performance measures were optimized for the improvement of machinability quality of product. A comparison is made between the multi-criteria decision making tools. Grey Relational Analysis (GRA) and TOPSIS are used to confirm and prove the similarity. To determine the influence of process parameters, Analysis of Variance (ANOVA) is employed. The end results of experimental investigation proved that the machining performance can be enhanced effectively with the assistance of the proposed approaches.

Optymalizację parametrów procesu toczenia stali nierdzewnej typu 15-5 utwardzanej wydzieleniowo (PH) badano stosując „szarą” analizę relacyjną (GRA) opartą na metodzie Taguchi i metodę rozwiązywania problemów decyzyjnych TOPSIS. Układ planowanych eksperymentów przedstawiono w formie tablicy ortogonalnej L27. Miarami jakości procesu były siła skrawania (Fz ) i chropowatość powierzchni (Ra). Miary te zostały zoptymalizowane w celu poprawy skrawalności. Przeprowadzono porównanie pomiędzy różnymi wielokryterialnymi metodami decyzyjnymi. Zastosowano „szarą” analizę relacyjną (GRA) i metodę TOPSIS by potwierdzić i udowodnić podobieństwo wyników. Zastosowano analizę wariancji (ANOVA) by wyznaczyć wpływy parametrów procesu toczenia. Wyniki końcowe badań eksperymentalnych potwierdzają, że jakość skrawania może być efektywnie podwyższona przy zastosowaniu wspomnianych metod.