Effects of cooling after rolling and heat treatment on microstructures and mechanical properties of Mo–Ti microalloyed medium carbon steel

Li, Defa; Dong, Hangyu; Wu, Kaiming; Isayev, Oleg; Hress, O.; Yershov, Serhii

doi:10.1016/j.msea.2019.138808

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…It can be seen that the grain size does affect the elastic constants of CoCrNi MEA to some extent since its neighbor grains own large-angle grain boundaries, and this prediction is consistent with reported observations [32][33][34]. More specifically, Fig.…”

Section: Mechanical Properties Of Cocrni Mea With Different Grain Sizessupporting

confidence: 91%

The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

2023

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In this paper, the molecular dynamics method was used to analyze mechanical properties and microscopic deformation mechanisms of CoCrNi medium-entropy alloy with different average grain sizes at various temperatures. Its elastic modulus and Poisson's ratio were first calculated by the constant pressure molecular dynamics method. It is found that the elastic modulus increases with the average grain size increasing and is reduced at elevated temperatures. However, its Poisson's ratio decreases with the average grain size increasing and is not sensitive to temperatures.Simulations of simple tension were carried out and the results show that: (1) when the average grain size exceeds 15.2 nm, its yield stress and maximum flow stress decreased with the average grain size raising (Hall-Petch relationship), in this situation it is speculated that the dislocation slips and deformation twins within the grains dominate the plastic deformation; (2) when the grain size is smaller than 15.2 nm, the two stress parameters instead increase with the average grain size increasing (Inverse Hall-Petch relationship), such a plastic deformation mechanism is understood mainly due to grain boundaries migrations and grain rotations. In the end, as temperature effects on microscopic deformation mechanisms are concerned, it is found that more dislocations tend to be plugged near grain boundaries which have lower mobility at lower temperatures. Accordingly, the two stress parameters increase as the temperature decreases.

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Section: Mechanical Properties Of Cocrni Mea With Different Grain Sizessupporting

confidence: 91%

The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

2023

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“…Secondly, the primary austenite grains should be as small and uniform as possible. 4 Moreover, a high reheating temperature is beneficial for increasing the solid solubility of microalloyed elements in the iron matrix. This provides conditions for generating more nano precipitates at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr on austenite grains growth behaviour of high strength Ti microalloyed low carbon steel

Luo,

Xiong,

Wang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The isothermal grain growth behaviour for three Ti microalloyed steels with different Zr contents (0–0.039 wt-%) at different reheating temperatures (1100, 1150, 1200 and 1250 °C) and for holding times (10, 60, 600 and 1800 s) was investigated. Austenite growth model was established to analyse and predict the functional relationship between austenite grains size and austenitising temperature and time during the isothermal austenitising process in the three tested steels, and the influence of Zr was discussed. The results indicate that the activation energy Q and time index n of austenite grains boundary migration in the tested steels decrease with the increase of Zr content. The addition of Zr can inhibit the growth of primary austenite grains at high temperatures. With the increase of Zr content, the trend of average grain size growth of primary austenite becomes smoother. The addition of Zr improves the high-temperature stability of precipitates, resulting in smaller precipitates and stronger pinning effect for austenite grains boundary in Ti–Zr microalloyed steel compared to that in Ti microalloyed steel at high temperatures.

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“…Kinds of high strength steels have been processed by direct quenching and many studies focused on the influence of the parameters of quenching proc-ess on the microstructure and mechanical properties of high strength steels [1][2][3][4][5]. While the research on temperature and microstructure uniformity during direct quenching process has been rarely reported [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

Yang

Tang

et al. 2022

Materialwissenschaft Werkst

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In order to improve the temperature and microstructure uniformity in the thickness direction of online‐quenching 960 MPa high strength steel, the finite element software ADINA and the experiments have been used to analyze the effect of internal air cooling on temperature variation in the thickness direction during the online quenching process. The results showed that the interval air cooling could effectively improve the uniformity of temperature, microstructure and hardness in the direction of thickness of steel plate during the online quenching process. When air cooled for 3.2 s, the temperature difference between the surface and the core of the steel plate could be reduced by 90.13 %, and the cooling rate in the core could be reduced by about 85.20 % compared with continuous water cooling condition. The hardness difference between the surface and the core could reduce from 23 HV 5 to 5 HV 5. The internal air cooling process had an influence on the matensite lath morphology compared with continuous water cooling process. The microstructures with the different cooling conditions were martensite and the properties could still meet the requirements of 960 MPa high strength steel.

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Effects of cooling after rolling and heat treatment on microstructures and mechanical properties of Mo–Ti microalloyed medium carbon steel

Cited by 10 publications

References 24 publications

The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

The effects of grain size and temperature on mechanical properties of CoCrNi medium-entropy alloy

Effect of Zr on austenite grains growth behaviour of high strength Ti microalloyed low carbon steel

Effect of air cooling time on temperature and microstructure uniformity of 960 MPa high strength steel by direct quenching

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