STEEL GRIPS online - Performance improvement of Fe-32Mn-6Si and Fe-14Mn-9Cr-5Ni-6Si shape memory steels by surface coating and thermomechanical treatment

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Dec 4, 2008

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Performance improvement of Fe-32Mn-6Si and Fe-14Mn-9Cr-5Ni-6Si shape memory steels by surface coating and thermomechanical treatment
By Tarak Bouraoui, Amin Charfi, and Bernard Normand

Shape memory steels, shape memory effect, corrosion, surface coating, thermomechanical treatment

Fe-Mn-Si-based steels have been studied in recent years for potential industrial applications. Compared with conventional shape memory alloys (Ni-Ti and copper-based alloys), shape memory steels exhibit better mechanical properties and lower production cost. However, additional effort is necessary in order to improve their performance. In the present research project, two shape memory steel grades are studied: Fe-32Mn-6Si (A1) and Fe-14Mn-9Cr-5Ni-6Si (A2). Alloy (A1) is characterized by a good shape memory effect but modest corrosion resistance. The presence of Cr and Ni in alloy (A2) improves corrosion resistance but not without impairing the shape memory properties. In this work, the corrosion resistance of A1 has been improved by zinc electroplating followed by chromate conversion, and the shape memory effect in A2 was improved by a thermomechanical treatment introducing a recovery process.

STEEL GRIPS 5 (2007) No.4 pp 285

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