Effect of alloying elements in steels on the kinetics of the austenite to bainite transformation

The kinetics of isothermal bainite formation at 483 K, 503 K and 533 K in a bearing SAE 52100 steel (1,01% C – 1,36% Cr – 0,32% Mn – 0,25% Si (wt.%)) is investigated theoretically and experimentally. It is found that the bainite formation becomes significantly slower with decreasing temperature. To interpret the results, a physical model with a concept of reconstructive approach proposed in the literature is applied. The model gives a reasonable agreement with experimental results, although a certain deviation exists at the late stage of the transformation. This deviation is attributed to the diffusion coefficient used in the model without considering the effect of alloying elements, mainly chromium.

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Effect of alloying elements on dispersion hardening of die steels in austenitic state

Deformation and Fracture of Materials ◽

10.31044/1814-4632-2019-4-10-13 ◽

2019 ◽

pp. 10-13

Author(s):

A.A. Krugljakow ◽

Keyword(s):

Alloying Elements ◽

Dispersion Hardening ◽

Die Steels ◽

Effect Of Alloying

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Effect of Alloying Elements on the Stacking Fault Energy and Ductility in Mg2Si Intermetallic Compounds

ACS Omega ◽

10.1021/acsomega.1c02099 ◽

2021 ◽

Author(s):

Xinpeng Zhao ◽

Keke Song ◽

Haiyou Huang ◽

Yu Yan ◽

Yanjing Su ◽

...

Keyword(s):

Intermetallic Compounds ◽

Stacking Fault ◽

Stacking Fault Energy ◽

Alloying Elements ◽

Effect Of Alloying

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Continuous Cooling Transformation Behaviour and Bainite Transformation Kinetics of 23CrNi3Mo Carburised Steel

Metals ◽

10.3390/met11010048 ◽

2020 ◽

Vol 11 (1) ◽

pp. 48

Author(s):

Wenjun Song ◽

Min Lei ◽

Mingpan Wan ◽

Chaowen Huang

Keyword(s):

Phase Transformation ◽

Volume Fraction ◽

Austenite Formation ◽

Steel Matrix ◽

Transformation Kinetics ◽

Bainite Transformation ◽

Continuous Cooling ◽

The Matrix ◽

Dimensional Growth ◽

Kinetics Of

In this study, the phase transformation behaviour of the carburised layer and the matrix of 23CrNi3Mo steel was comparatively investigated by constructing continuous cooling transformation (CCT) diagram, determining the volume fraction of retained austenite (RA) and plotting dilatometric curves. The results indicated that Austenite formation start temperature (Ac1) and Austenite formation finish temperature (Ac3) of the carburised layer decreased compared to the matrix, and the critical cooling rate (0.05 °C/s) of martensite transformation is significantly lower than that (0.8 °C/s) of the matrix. The main products of phase transformation in both the carburised layer and the matrix were martensite and bainite microstructures. Moreover, an increase in carbon content resulted in the formation of lamellar martensite in the carburised layer, whereas the martensite in the matrix was still lath. Furthermore, the volume fraction of RA in the carburised layer was higher than that in the matrix. Moreover, the bainite transformation kinetics of the 23CrNi3Mo steel matrix during the continuous cooling process indicated that the mian mechanism of bainite transformation of the 23CrNi3Mo steel matrix is two-dimensional growth and one-dimensional growth.

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