Effect of Cooling Rate on Phase Transformation and Microstructure Evolution in a Large Size Forged Ingot of Medium Carbon Low Alloy Steel

2017 ◽  
pp. 413-423
Author(s):  
Emna Ben Fredj ◽  
Hadi Ghasemi Nanesa ◽  
Davood Shahriari ◽  
Jean-Benoit Morin ◽  
Mohammad Jahazi
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
Alloy Steel ◽  
Microstructure Evolution ◽  
Low Alloy Steel ◽  
Medium Carbon ◽  
Large Size

Modeling of Microstructure Evolution of Athermal Transformation of Lath Martensite

2007 ◽  
Vol 539-543 ◽  
pp. 4795-4800 ◽  
Author(s):  
Don H. Sherman ◽  
Bing J. Yang ◽  
Adrian V. Catalina ◽  
Ashwin A. Hattiangadi ◽  
Patrick Zhao ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Alloy Steel ◽  
Microstructure Evolution ◽  
Lath Martensite ◽  
Heat Treatments ◽  
Dynamic Loads ◽  
Low Alloy Steel ◽  
Cooling Rates ◽  
Medium Carbon

Martensitic microstructures in steels provide the strength and toughness required for the dynamic loads experienced by construction and mining machines. Such microstructures are produced with appropriate heat treatments. A physics based model has been developed to represent the microstructure evolution during the martensitic transformation. This modeling has been used to understand the role of as-quenched microstructure on subsequent processing. This paper describes modeling the martensitic transformation in steels under different cooling rates. The model described in this paper has been validated with a medium carbon, low alloy steel.

Influence of the Quench Process on Microstructure Evolution in a Landing Gear Steel

2014 ◽  
Author(s):  
Samir Mourad Chentouf ◽  
Mohammad Jahazi ◽  
Rejean Fortin
Keyword(s):  
Phase Transformation ◽  
High Resolution ◽  
Cooling Rate ◽  
Microstructure Evolution ◽  
Retained Austenite ◽  
Micro Hardness ◽  
Large Size ◽  
300M Steel ◽  
Gear Steel ◽  
Vickers Micro Hardness

The quench process of large size components is always problematic owing to non-uniform phase formation. In this context, the influence of cooling rate on phase transformation, for different cooling rates, in 300M steel is studied. A combination of high resolution dilatometry, optical microscopy, Vickers micro hardness measurements were employed to accurately determine the critical transformation temperature, and to identify microstructure constituents (bainite, martensite, and retained austenite). A mixture of bainite, martensite and some retained austenite phases were observed to appear at cooling rate of 0.25°C/sec whereas for a cooling rate of 50°C/sec the microstructure is totally martensitic.

Effect of Thermocyclic Treatment with Different Cooling Rates on the Mechanical Characteristics of 42CD4 Low-Alloy Steel

2019 ◽  
Vol 397 ◽  
pp. 169-178
Author(s):  
Fethia Bouaksa ◽  
Mamoun Fellah ◽  
Naouel Hezil ◽  
Ridha Djellabi ◽  
Mohamed Zine Touhami ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Alloy Steel ◽  
Mechanical Characteristics ◽  
Steel Sample ◽  
Low Alloy Steel ◽  
Cooling Rates ◽  
Microstructure Characteristics ◽  
Thermocyclic Treatment ◽  
Hardness Values

The aim of this study was to investigate the influence of thermo-cyclic treatments on the mechanical characteristics (Hardness and Resilience) of low-alloy 42CD4 steel. Thermocyclic treatment on 42CD4 steel was operated for four cycles at 850 °C for 30 min. After each cycle, the steel sample was cooled in different medium (open air and water) in order to check the effect of the cooling rate on the microstructure characteristics. It was found that the cooling rate can affect the mechanical characteristics of the steel. The hardness values of steel cooled in water were higher than those of steel cooled in air. Additionally, there was an increase in the resilience of steel sample with the increase of thermocyclic number.

Formation and corrosion resistance of a phosphate chemical conversion coating on medium carbon low alloy steel

2016 ◽  
Vol 40 (2) ◽  
pp. 1347-1353 ◽  
Author(s):  
Cong-cong Jiang ◽  
Gui-yong Xiao ◽  
Xian Zhang ◽  
Rui-fu Zhu ◽  
Yu-peng Lu
Keyword(s):  
Corrosion Resistance ◽  
Alloy Steel ◽  
Crystalline Structure ◽  
Chemical Conversion ◽  
Conversion Coating ◽  
Low Alloy Steel ◽  
Medium Carbon ◽  
Fine Crystalline Structure ◽  
Chemical Conversion Coating

A uniform fine-crystalline structure is obtained upon PCC coating on 35CrMnSi with Fe2+ curing (b).

Sign in / Sign up

Export Citation Format

Share Document