Influence of Si addition on the carbon partitioning process in martensitic-austenitic stainless steels

20th Chemnitz Seminar on Materials Engineering - 20. Werkstofftechnisches Kolloquium

Huang, Q.^1 ; Volkova, O.^1 ; De Cooman, B.C.^2 ; Biermann, H.^3 ; Mola, J.^1

Institute of Iron and Steel Technology, Technische Universität Bergakademie Freiberg, Leipziger Str. 34, Freiberg

09599, Germany^1

Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Gyeongbuk, Pohang

790-784, Korea, Republic of^2

Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Straße 5, Freiberg

09599, Germany^3

关键词: Carbon partitioning;    Martensite fraction;    Martensite start temperature;    Partitioning step;    Quench temperature;    Quenching and partitioning;    Temperature intervals;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/373/1/012001/pdf
DOI  :  10.1088/1757-899X/373/1/012001

来源: IOP

【 摘 要 】

The effect of Si on the efficiency of carbon partitioning during quenching and partitioning (Q&P) processing of stainless steels was studied. For this purpose, 2 mass-% Si was added to a Fe-13Cr-0.47C reference steel. The Si-free (reference) and Si-added steels were subjected to Q&P cycles in dilatometer. The carbon enrichment of austenite in both steels was evaluated by determining the temperature interval between the quench temperature and the martensite start temperature of secondary martensite formed during final cooling to room temperature. In Q&P cycles with comparable martensite fractions at the quench temperature, the carbon enrichment of austenite after partitioning was similar for both steels. To compare the mechanical stability of austenite, Q&P-processed specimens of both steels were tensile tested in the temperature range 20-200 °C. The quench and partitioning temperatures were room temperature and 450 °C, respectively. Si addition had no meaningful influence on mechanical stability of austenite. The results indicate that the suppression of cementite formation by Si addition to stainless steels, as confirmed by transmission electron microscopy examinations, has no noticeable influence on the carbon enrichment of austenite in the partitioning step.