Analysis of powder metallurgy process parameters for mechanical properties of sintered Fe-Cr-Mo alloy steel

作者：Chauhan Sandeep; Verma Vikas; Prakash Ujjwal; Tewari P C; Khanduja Dinesh

来源：Materials and Manufacturing Processes, 2017, 32(5): 537-541.

DOI：10.1080/10426914.2016.1221083

• ANOVA
• cooling rate
• desirability
• hardness
• powder metallurgy
• sintering temperature
• tensile strength

The present work involves an investigation to find out the best combination of process parameters for a Fe-Cr-Mo alloy with the help of Design of Experiments (DOE) tool. The Fe-Cr-Mo alloy containing 0, 0.4 and 0.8wt.% carbon is compacted at 650MPa pressure and sintered at 1120 degrees C and 1200 degrees C temperature, respectively, with 3.5 or 6 degrees C/minute cooling rate. Quality characteristics like hardness and tensile strength are analyzed for various combinations of graphite weight %, sintering temperature, and cooling rate. The conducted experimental trials are based on the design matrix obtained from general factorial design. Significant regression models are developed from the above mentioned process parameters to predict the quality characteristics using DOE tool. The developed mathematical model during the course of research helped in investigating best combination of process parameters for powder processing. The desirability test showed its usefulness in finding out the number of optimization strategies to achieve the optimum values of hardness and tensile strength. The observed results are correlated with the microstructure. Diffusion of carbon during sintering decides the optimum amount of carbon. Higher carbon addition results in residual graphite which weakens the sintered alloy.

• 出版日期2017