Mechanical Properties of Fe–P–(Mo, Mn) Sintered Alloy Designed with Si Added Lean Alloy Powder Composition
A lean alloy is defined as a low alloy steel that minimizes the content of the alloying elements while maintaining the characteristics of the sintered alloy. The purpose of this study is to determine the change in mechanical properties with the addition of silicon in Fe–P–Mo, Fe–P–Mn, and Fe–P–Mo–Mn alloys. Silicon-added Fe–P–Mo, Fe–P–Mn, and Fe–P–Mo–Mn master alloys were compacted at 7.0 g/cm3 and then sintered under a H2–N2 atmosphere at 1120 °C. The sintered density of three alloy systems having the same green density (7.0 g/cm3) decreased owing to dimensional expansion with an increasing Si content. As the diffusion rate in the Fe–P–Mo system is faster than that in the Fe–P–Mn system, the decrease in the sintered density was largest in the Fe–P–Mn system. The transverse rupture strengths (TRS) of the Fe–P–Mo and Fe–P–Mo–Mn systems were constant as the Si content increased. However, the TRS slope of the Fe–P–Mn changed at 0.4 wt% Si; this is caused by phase change, where the α + γ phase was transformed into a full α phase for Si contents higher than 0.4 wt%.
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Document Type: Research Article
Publication date: September 1, 2018
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