Transformation of austenite during isothermal annealing at 600–900 °C for heat-resistant stainless steel
作者： Ladislav Kosec , Štefan Šavli , Stjepan Kožuh , Tamara Holjevac Grgurić , Aleš Nagode
DOI: 10.1016/J.JALLCOM.2013.03.102
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摘要: Abstract In this work, the results of transformation kinetics austenite heat-resistant stainless steel (AISI 310S) with 2.27 wt.% silicon were presented. The microstructural and fractography analysis, as well hardness after isothermal heat treatment in temperature range from 600 to 900 °C at different annealing times (from 1 956 h) are shown. It was found that microstructure consisted austenite, carbide (M23C6) σ-phase. number σ-phase precipitates increases higher times. longer annealed samples significant coarsening observed, a large amount particles form chain network plates. Precipitates both observed grain boundaries within grains. precipitation involves two mechanisms: γ → Cr23C6 → σ γ → α′ → σ. began increase 48 h 600 °C, while 700–900 °C increased than 8 h. slope curve is caused by changes. fracture surface mode intercrystalline brittle. Relatively dimples can be related which occurred long
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