Phase transformations in an AISI 410S stainless steel observed in directional and laser-induced cooling regimes

Abstract

The applications of the chromium ferritic stainless steel AISI 410S have been considerably increased in the last years in many technical fields as chemical industries and oil or gas transportation. However, the phase transformation temperatures are, currently, unknown for this alloy. The aim of this work is to determine the alpha to gamma transformation temperatures of the AISI 410S alloy in different cooling conditions and to analyze them using continuous cooling theory. In order to achieve different cooling rates and thermal conditions, two complementary techniques were used: Bridgman furnace crystal growth and laser remelting technique. The measured solidification temperature was around 1730 and 1750 K. Plate-like and dendritic austenite precipitates were obtained in solid-state phase using growth rates between 5 and 10 µm/s in directional growth experiments. Only plate-like austenite phase was observed in the experiments using growth rates above 100 µm/s. The appearance of dendrites, with the consequent segregation of the elements, can be previously determined by the microstructure modeling currently proposed. Massive austenite can be produced from 0.3 to 10 mm/s rates at temperatures between 1100-1300 K. The structure might be less sensitive to corrosion because this phase is produced without microsegregation.

Influence of Varying Welding Current on Impact Strength of Metal Inert Gas Welding Joints

“…Type 410 stainless steel is the basic alloy in martensitic family. It is an iron-chromium alloy contains 11.5 % to 13 % chromium and can be hardened by heat treatment to the highest strength level [18][19] [20]. This type of steel finds major application in products that must resist atmospheric oxidation, mildly corrosive chemicals and wet and dry corrosion environment found in steam and gas turbine parts, bearing and cutlery.The chemical properties and mechanical properties of both the metals are given in the TABLE I and TABLE II. The metal pieces were machined into 64 x 12.7 x 3.2 mm as per the ASTM standards.…”

Finite element investigation of residual stresses during laser powder deposition process as an innovative technique to repair worn rails

“…Depending on the rate of cooling, M s(410L) may vary over a wide range of temperatures, that is, 245–375°C. 25 Based on the findings of Lima et al 25 M s(410L) has an inverse correlation with the cooling rate and its austenization temperature ( A c(410L) ). In consonance with the dilatometry findings of Deev et al, 24 the A c(410L) is considered equal to 900°C.…”

Különleges lőfegyvercsövek károsodáselemzése

“…Az 590 HV 0,025 alapkeménységhez képest a 700 HV 0,025 fölé növekedő keménység oka valószínűleg nem más, mint az újraausztenitesedés utáni edződés. Ez pedig azt is jelenti, hogy a puskacső belső felületének hőmérséklete megközelítette az 1200°C-t, ugyanis a Fe-Cr-C pszeudobinér fázisdiagramok [5] szerint közel ekkora hőmérséklet kell az ausztenitesedés megindulásához.…”