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      Effect of N/C Ratio on Precipitation Behavior of (Cr,Fe)23C6 Carbide in Novel Cast Austenitic Heat-Resistant Steels during Directional Solidification

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      Metals
      MDPI AG

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          Abstract

          The precipitation of (Cr,Fe)23C6 carbide could significantly degrade the mechanical properties of Nb-bearing cast austenitic heat-resistant steels, designed for exhaust components of automotive gasoline engines at 1000 °C. In the current research, the precipitation behavior of (Cr,Fe)23C6 carbide in these alloys, with great variations in N/C (Nitrogen/Carbon) ratio, was investigated through the liquid metal cooling directional solidification method, combined with thermodynamic calculations. Microstructural characterization suggested that the (Cr,Fe)23C6 carbide formed in the steady-state zone and the competitive zone, upon cooling to room temperature, after the solidification ended. It grew in the colony of the δ-ferrite, through the eutectoid reaction and showed different concentrations of C and Si from the δ-ferrite. Its precipitation temperature decreased significantly with increasing the N/C ratio, thereby retarding its precipitation. Therefore, the quantity of (Cr,Fe)23C6 carbide could be limited though increasing the N/C ratio of this type of alloys.

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          Recent developments in stainless steels

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            Precipitation in creep resistant austenitic stainless steels

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              Decomposition of Austenite in Austenitic Stainless Steels

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                Author and article information

                Journal
                MBSEC7
                Metals
                Metals
                MDPI AG
                2075-4701
                September 2018
                August 29 2018
                : 8
                : 9
                : 678
                Article
                10.3390/met8090678
                8c16cd91-b8a0-4faf-a8a0-912770f4f384
                © 2018

                https://creativecommons.org/licenses/by/4.0/

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