Bainite and martensite start temperature calculated with exponential carbon dependence

Materials Science and Technology - Tập 28 Số 4 - Trang 487-495 - 2012
S.M.C. van Bohemen1
1Tata Steel Research, Development and Technology, 1970 CA IJmuiden, The Netherlands

Tóm tắt

Analysis of published data demonstrates that the start temperatures of bainite ( Bs) and martensite ( Ms) formation exhibit an exponential carbon dependence. Empirical models are proposed to describe this specific carbon dependence. The models are relatively simple and sufficiently accurate for conventional steels with 0·1–1·9 wt- carbon and less than 7 wt- in total of other alloying elements. Predictions of the Bs and Ms temperatures show a better accuracy than those obtained with equations from literature. An improved prediction of the Ms temperature is important to accurately determine of the amount of martensite at a certain arrest temperature using the Koistinen and Marburger (KM) equation. Predictions of the volume fraction martensite are also influenced by the rate parameter αm controlling the kinetics of martensite formation. Based on the improved models for the composition dependence of Ms and αm, the volume fraction of retained austenite at room temperature has been calculated for Fe–C alloys. The calculated fraction of retained austenite as a function of carbon content is found to be in good agreement with published data, which gives confidence in the proposed models for Ms and αm.

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Materials Science and Technology

Tập 28 Số 4

487-495

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