Phosphorus is an element that plays many important roles in powder metallurgy as an alloy element. The purpose of this study is to investigate the influence of phosphorus addition on the microstructures and mechanical properties of sintered low-alloy steel. The sintered low-alloy steels Fe-0.6%C-3.89%Ni-1.95%Cu-1.40%Mo-xP (x=0, 0.05, 0.10, 0.15, 0.20%) were manufactured by compacting at 700 MPa, sintering in H2-N2 at 1260℃, rapid cooling, and low-temperature tempering in Ar at 160℃. The microstructure, pore, density, hardness, and transverse rupture strength (TRS) of the sintered low-alloy steels were evaluated. The hardness increased as the phosphorus content increased, whereas the density and TRS showed maximum values when the content of P was 0.05%. Based on microstructure observation, the phase of the microstructure changed from bainite to martensite as the content of phosphorus is increased. Hence, the most appropriate addition of phosphorus in this study was 0.05%.

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
4. 결 론
References

• 김유영(경남과학기술대학교 기계공학과) | Yoo-Young Kim (Department of Mechanical Engineering, Gyeongnam National University of Science and Technology) Corresponding Author
• 조권구(경상대학교 나노신소재융합공학과 & 그린에너지융합연구소) | Kwon-Koo Cho (Department of Materials Engineering and Convergence Technology & RIGET, Gyeongsang National University)