Abstract
Microstructural changes in alloys can be induced by phase transformations. While many phase transformations are thermally activated, some are not. An important example of the nonthermally activated type is the deformation-induced phase transformation. Deformation-induced phase transformations are known to cause unusual changes in the mechanical properties of ferrous and nonferrous alloys. In the past several years it has been shown that this type of transformation can considerably enhance the mechanical properties of high-strength austenitic alloys— these alloys are now known as “TRIP” steels. Useful combinations of toughness, strength, and ductility can be obtained in these steels by control of the composition and the processing. TRIP steels are thermomechanically processed in the austenitic state. During this thermomechanical processing, changes occur in both chemistry and substructure, and these alter the stability of austenite with respect to deformation during subsequent mechanical testing. The present chapter discusses the several compositional, processing, and testing variables that influence this austenite stability. It is shown that the strength, ductility, stress-strain behavior, fracture toughness, fatigue properties, and corrosion resistance of TRIP steels are strongly affected by austenite stability. The considerations involved in designing TRIP Steels, their limitations, and some of the steps that have been taken to overcome these limitations, are reviewed. Recent studies are described in which attempts were made to incorporate the TRIP phenomenon in other classes of steels. These include nonnickel cryogenic steels and low and medium alloy quenched and tempered ultrahigh-strength steels.
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Zackay, V.F., Bhandarkar, M.D., Parker, E.R. (1978). The Role of Deformation-Induced Phase Transformations in the Plasticity of Some Iron-Base Alloys. In: Burke, J.J., Weiss, V. (eds) Advances in Deformation Processing. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-4024-9_11
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