The microstructure and phase stability of the Fe-15Mn-7Si-9Cr-5Ni stainless steel shape memory alloy in the temperature range of 600 °C to 1200 °C was investigated using optical and transmission electron microscopy, X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and chemical analysis techniques. The microstructural studies show that an austenite single-phase field exists in the temperature range of 1000 °C to 1100 °C, above 1100 °C, there exists a three-phase field consisting of austenite, δ-ferrite, and the (Fe,Mn)3Si intermetallic phase; within the temperature range of 700 °C to 1000 °C, a two-phase field consisting of austenite and the Fe5Ni3Si2 type intermetallic phase exists; and below 700 °C, there exists a single austenite phase field. Apart from these equilibrium phases, the austenite grains show the presence of athermal ε martensite. The athermal α′ martensite has also been observed for the first time in these stainless steel shape memory alloys and is produced through the γ-ε-α′ transformation sequence.
CITATION STYLE
Maji, B. C., Krishnan, M., & Rama Rao, V. V. (2003). The microstructure of an Fe-Mn-Si-Cr-Ni stainless steel shape memory alloy. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 34 A(5), 1029–1042. https://doi.org/10.1007/s11661-003-0124-y
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