The effect of the microstructure on the superplasticity of a duplex stainless steel
- Univ. Estadual de Campinas, Sao Paulo (Brazil)
The aim of this work is to study the effect of the microstructure on the superplasticity of 22% Cr-5% Ni-3% Mo-0.18% N ferrite ({alpha})-austenite ({gamma}) duplex stainless steel. To obtain different microstructures several thermo-mechanical treatments were employed. Superplasticity was evaluated at 1,253 K by m-value measurements, elongation to failure, deformation homogeneity, and changes in microstructure after tensile tests. A maximum elongation of 1510% was reached with an initial strain rate of 3 {times} 10{sup {minus}4}/s. For this condition, the m-value attained 0.64 and necking was not verified. Higher degrees of superplasticity are obtained when the initial microstructure of the material is fine and homogeneous. Such microstructure can be obtained by a solution treatment in the {alpha}-single phase field, followed by a heavy cold rolling operation and a new solution treatment in the {alpha}/{gamma} dual phase field. The precipitation of {sigma}-phase during superplastic deformation promotes cavitation and decreases the deformation homogeneity and the elongation to failure.
- OSTI ID:
- 644306
- Report Number(s):
- CONF-9704224--
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 11 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of temperature and strain rate on cavitation in a superplastic duplex stainless steel
Superplasticity in a nickel silicide alloy, Ni sub 3 Si (V,Mo)