Effect of Composition on Strain-Induced Martensite Transformation of FeMnNiC Alloys Fabricated by Powder Metallurgy

• Published in: Archives of metallurgy and materials Vol. 65; no. 3; pp. 1001 - 1004
• Main Authors: Choi, Seunggyu, Jeon, Junhyub, Seo, Namhyuk, Moon, Young Hoon, Shon, In-Jin, Lee, Seok-Jae
• Format: Journal Article
• Language: Polish; English
• Published: Warsaw Polish Academy of Sciences 01.01.2020
• Subjects: Alloy powders; Austenite; austenite stability; Chemical composition; Composition effects; Dislocation density; femnnic alloy; Grain size; hardness; Heat treating; Manganese; Martensite; Martensitic transformations; Mechanical properties; Microstructure; Nickel; Plasma sintering; Plastic deformation; Powder metallurgy; Room temperature; Sintering (powder metallurgy); Spark plasma sintering; Stability analysis; strain-induced martensite
• ISSN: 2300-1909; 1733-3490; 2300-1909
• DOI: 10.24425/amm.2020.133206

We investigated the austenite stability and mechanical properties in FeMnNiC alloy fabricated by spark plasma sintering. The addition of Mn, Ni, and C, which are known austenite stabilizing elements, increases its stability to a stable phase existing above 910°C in pure iron; as a result, austenitic microstructure can be observed at room temperature, depending on the amounts of Mn, Ni, and C added. Depending on austenite stability and the volume fraction of austenite at a given temperature, strain-induced martensite transformation during plastic deformation may occur. Both stability and the volume fraction of austenite can be controlled by several factors, including chemical composition, grain size, dislocation density, and so on. The present study investigated the effect of carbon addition on austenite stability in FeMnNi alloys containing different Mn and Ni contents. Microstructural features and mechanical properties were analyzed with regard to austenite stability.