The anisotropic kinetics of strain aging in a martensitic steel. (2nd January 2018)

• Record Type: Journal Article
• Authors: Lai, Q.; Sinclair, C. W.; Poole, W. J.
• Is Part Of: Canadian metallurgical quarterly. Volume 57:Number 1(2018)
• Page Start: 20
• Page End: 27
• Publication Date: 2018-01-02
• Subjects: Strain aging -- martensite -- Bauschinger effect -- torsion -- steel; Metallurgy -- Periodicals; 669.05
• DOI: 10.1080/00084433.2017.1384211
• Languages: English
• ISSNs: 0008-4433

Abstract

ABSTRACT: An experimental study has been conducted to evaluate the effect of static strain aging (bake hardening) on the yield strength and yield strength asymmetry in torsion and torsion/reverse torsion tests on a low-carbon martensitic steel. It is shown that vastly different strain aging responses are observed in the forward and reverse portions of the torsion test following strain aging. While the yield stresses can be described phenomenologically by classic segregation kinetics, the observed asymmetry in the kinetics and magnitude of strain aging call into question the simple interpretation of dislocation de-pinning. This is further emphasised by the fact that strain aging modifies the apparent work hardening rate in the reverse loading tests.