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Abstract:
The cyclic deformation
characteristics and microstructural changes of high manganese
nonmagnetic steel have been studied. It was found that the experimental
material showed cyclic softening at room temperature but cyclic
hardening at low temperatures when the strain amplitudes were relatively
low(1/2Δεt =0.25%),0.5%, but only cyclic hardening was showed at room or
low temperatures when the strain amplitude was relatively high(1/2Δεt
=1.0%).The cyclic softening of the experimental material consisted with
the softening which was resulted in by the decomposition of IS
complexes. The cyclic hardening was due to the formation of
deformation-induced martensite, and the effect of distocation hardening
of the austenite martrix under relatively high strain amplitude.
Key words:
High
manganese steel Nonmagnetic steel Cycle deformation
国家自然科学基金资助项目. Received 19910303,
received in revised form 19920505
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