Measurement of volume fraction of stress-induced {var_epsilon} martensite in Fe-32Mn-6Si alloy
- Korea Inst. of Science and Technology, Seoul (Korea, Republic of). Div. of Metals
- Woojin OSK Corp., Kyunggi (Korea, Republic of). Research Inst. of Measuring Technology
- Yonsei Univ., Seoul (Korea, Republic of). Dept. of Metallurgical Engineering
Fe-Mn-Si alloy has drawn much attention due to its shape memory effect and damping capacity which are based on {gamma} {leftrightarrow} {var_epsilon} non-thermoelastic transformation. Thermoelastic martensitic alloys like Ni-Ti undergo complete transformation if they are cooled below Mf temperature. In a Fe-Mn-Si alloy, however, the volume fraction of {var_epsilon} martensite below Mf depends on its heat treatment condition because of the incomplete non-thermoelastic transformation. Thus measurement of the volume fraction of {epsilon} martensite is necessary to correlate it with some physical and mechanical properties. In this work, the authors propose a new way of measuring the volume fraction of stress-induced {epsilon} martensite based on the volume expansion accompanying {var_epsilon} {yields} {gamma} transformation. Cold rolling is applied to generate anisotropic {var_epsilon} martensite, and the length change is measured in the RD, TD and ND during heating. Dilatometric behavior in the three directions and variation in the volume fraction are investigated with various degrees of cold rolling.
- OSTI ID:
- 136937
- Journal Information:
- Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 12 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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