Effect of solution hardening on the shape memory effect of Fe-Mn based alloys

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00337-U· OSTI ID:237830

Tsuzaki, K; Natsume, Y; Maki, T ^[1]; Tomota, Y ^[2]

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1. Kyoto Univ. (Japan). Dept. of Materials Science and Engineering
2. Ibaraki Univ., Hitachi (Japan)

Fe-high Mn-Si alloys, which undergo {gamma} (fcc) to {var_epsilon} (hcp) martensitic transformation, exhibit a pronounced shape memory effect. The origin of shape memory effect of these alloys is the reversion of stress-induced {var_epsilon} martensite. A shape change must hence be accomplish3ed by stress-induced martensitic transformation without permanent slip in austenite ({gamma}) in order to obtain a good shape memory effect. It is clear that the intrusion of permanent slip can be suppressed by increasing the strength of austenite and by decreasing the applied stress required for a shape change due to stress-induced martensitic transformation. It has been reported that the addition of the interstitial elements of C and N as well as the substitutional elements of Mo and V increases the 0.2% proof stress of austenite in Fe-high Mn alloys. However, there have been few studies on the effect of these alloying elements on the shape memory effect of Fe-high Mn based alloys. In the present study, it was aimed to improve the shape memory effect of Fe-high Mn based alloys by the strengthening of austenite through solution hardening due to C and Mo.

• OSTI ID: 237830
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 7 Vol. 33; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CARBON ADDITIONS
CHEMICAL COMPOSITION
CRYSTAL-PHASE TRANSFORMATIONS
DISLOCATIONS
FCC LATTICES
HARDENING
HCP LATTICES
INTERSTITIALS
IRON ALLOYS
MANGANESE ALLOYS
MARTENSITE
MOLYBDENUM ADDITIONS
SHAPE MEMORY EFFECT
SILICON ALLOYS
SLIP
STRESSES