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Strain-rate sensitive ductility in a low-alloy carbon steel after quenching and partitioning treatment

Strain-rate sensitive ductility in a low-alloy carbon steel after quenching and partitioning treatment

We investigate an extraordinarily high ductility in a low alloy carbon steel at an elevated temperature after a quenching and partitioning (Q&P) treatment. The conventional (quenched and tempered) reference material does not show similar behavior. Interestingly, the Q&P treated material’s ductility is considerably reduced at increasing strain rates while strength remains almost constant. These results indicate the presence of a diffusion-controlled deformation mechanism at elevated temperatures.

13

2023

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04

Ultrahigh strength ductile microalloyed steel with a very low yield ratio developed by quenching and partitioning heat treatment

Ultrahigh strength ductile microalloyed steel with a very low yield ratio developed by quenching and partitioning heat treatment

In this study, a microalloyed low carbon steel was subjected to quenching and partitioning (Q&P) heat treatment processes. The primary ferrite-pearlite microstructure of the steel was transformed into a bainitic microstructure containing interlath and sporadic blocks of retained austenite. The applied heat treatment process partitioned the carbon into the retained austenite to a weight percentage of 0.136. The microalloyed low-carbon steel acquired a continuous yield with high yield strength, a gigapascal level of ultimate tensile strength (i.e., ~ 1.1 GPa), and a very low yield ratio (i.e., 0.55) while retaining reasonable ductility and toughness when compared to the preheat-treated values.

13

2023

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04

Prediction of re-oxidation behaviour of ultra-low carbon steel by different slag series

Prediction of re-oxidation behaviour of ultra-low carbon steel by different slag series

A kinetic model was developed using FactSage Macro Processing to simulate the re-oxidation of ultra-low carbon steel via different oxidising slags. The calculated results show good agreement with experimental laboratory thermal simulation data. Therefore, the model can be used to predict the change behaviour of slag-metal-inclusion in the re-oxidation reaction of liquid steel. It can provide prediction and guidance for an accurate secondary oxidation control process.

13

2023

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04

Determination of non-metallic inclusions in a continuous casting slab of ultra-low carbon interstitial free steel by applying of metallographic method, electrolytic method and RTO technique

Determination of non-metallic inclusions in a continuous casting slab of ultra-low carbon interstitial free steel by applying of metallographic method, electrolytic method and RTO technique

Metallographic, electrolytic method and RTO(room temperature organic) technique were applied in the present study to more accurately determine non-metallic inclusion in a ultra-low carbon interstitial free(IF) steel and further to confirm their origination in a Compact Strip Production Process (CSP Process) continuous casting (CC) slab. Results show that inclusions detected by metallographic method usually appear relative smaller size and are mainly Al2O3 based or TiN based in composition, whereas those extracted by electrolytic method usually have larger size and are much more calcium-silicate based in composition.

13

2023

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04

The Role of Nitrogen and Argon in Iron and Steel Enterprises

The Role of Nitrogen and Argon in Iron and Steel Enterprises

Due to historical reasons, China's original carbon dioxide gas cylinders have been used for a long time with a pressure of 125 kilograms per square centimeter and a filling coefficient of 0.75 kilograms per liter. Under such operating conditions, the applicable operating temperature limit is very low, while the objective operating temperature is relatively high. Therefore, the gas cylinder has been in an overpressure state for a long time, and many accidents have occurred. In 1965, the original Ministry of Labor revised the "Gas Cylinder Safety Supervision Regulation"

30

2019

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10

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