Martensite - Wikipedia
In certain alloy steels, martensite can be formed by working the steel at M s temperature by quenching to below M s and then working by plastic deformations to reductions of cross section area between 20% and 40% of the original. The process …
Martensite-start temperature, Thermodynamics - Academic library
Martensite occurs when the free energy difference C Y_>ot between these two phases reaches a critical value Gj~'a. This gives much improved predictions of the Ms temperature when the steels is richly alloyed, in which case |AG^“| can be as large in magnitude as 3000 J mol -1.
Determination of Martensite Start Temperature of High‐Speed …
2020年5月27日 · These finely dispersed nanometer-sized carbides provide the exceptionally high hardness of HSS at elevated temperatures. To obtain the aforementioned martensitic matrix, the final temperature during quenching must fall below …
Martensite Start Temperature - an overview - ScienceDirect
The martensite start temperature (M s) is the temperature at which martensite starts to form on cooling. The martensite finish temperature (M f) is the temperature at which martensite transformation on cooling is essentially finished.
Martensite can form at very low temperatures, where diffusion, even of interstitial atoms, is not conceivable over the time period of the experiment. Table 1 gives values of the highest temperature at which martensite forms in a variety of materials; this temperature is known as the martensite–start, or MS temperature. It is obvious that ...
Prediction of martensite start temperature of steel combined …
2024年5月29日 · The martensite start temperature (M S) plays a pivotal role in formulating heat treatment regimes for steel. This paper, through the compilation of experimental data from literature and the incorporation of expert knowledge to construct features, employs machine learning algorithms to predict the M S of steel.
Martensite Formation - an overview | ScienceDirect Topics
Martensite, the hardening constituent in quenched steels, is formed at temperatures below about 200°C.
Hardened mi-crostructures in steels require the generation of the parent phase austenite, the formation of martensite crystals by diffusionless, shear-type martensitic trans-formation, and adjustment of final strength and tough-ness by tempering.
On the Temperature-Dependence of Deformation-Induced Martensite …
2023年8月23日 · In this study, the deformation-induced α-martensite formation in AISI 304L steel was investigated in the temperature range between 75 °C and − 196 °C in the light of the temperature-dependence of hydrogen embrittlement phenomena.
Martensite Transformation Start Temperature During Quench …
2021年2月19日 · It is important for the improvement of mechanical properties of quenching and partitioning (QP) steels to control the martensite transformation behavior and the stability of untransformed austenite. In this study, we evaluated the martensite transformation restart temperature (Mr) via a dilatometer during the reheat austempering pattern.