The Analysis of Physical-Structural Properties for AISI 321 Steel

Abstract

The applications of stainless steels may be meeting in chemical industry, food industry, civil building, but present an increased interest also in machine constructions or household.This paper highlight the structural modifications obtained after temperature variations for AISI 321 stainless steel. The modifications of structure and proprieties can be induced by heat treatments applied to semi-products before or after the obtaining of final parts, but also by heating at regimes which respect the exploitation conditions of part. In the experiments, it is applied quenching to put into solution, with modification of final treatment temperature and maintaining time, aiming the dissolution of complex carbides and in this mode an easy processing. The treatment parameters were chosen, after the determination of alloying elements by AISI 321 samples, by optic spectrometry. The dilatometric analysis aimed to highlight the structural modifications, specific to thermal fatigue phenomenon, due to temperatures variations.

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“…In particular, Anderson et al [1] examined in detail the process of production and heat treatment of this steel. Baitanu et al [2] studied the specifics of heat treatment of steel and modifications of its structure and properties by heat treatments. Shahri et al [3] studied possibility of forming nano-sized grains due to martensite-austenite transformations, with the minimum grain size (70 nm) being obtained as a result of cold rolling at À20°C, followed by annealing at 750°C.…”