Effect of manganese bands on austenite formation of low carbon steels in dual phase steel manufacture

2020 ◽  
Author(s):  
Bharath Bandi ◽  
Joost van Krevel ◽  
Sukalpan Nandi ◽  
Zulfiqar Husain ◽  
Prakash Srirangam
Keyword(s):  
Dual Phase Steel ◽  
Carbon Steels ◽  
Austenite Formation ◽  
Dual Phase ◽  
Low Carbon ◽  
Low Carbon Steels

MITTAL DI-FORM 140T, HB T965

Alloy Digest ◽  
2007 ◽  
Vol 56 (4) ◽  
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Martensite Phase ◽  
Carbon Steels ◽  
Ferrite Phase ◽  
Dual Phase ◽  
Low Carbon ◽  
Dp Steel ◽  
Low Carbon Steels ◽  
Soft Ferrite

Abstract MITTAL DI-FORM 140T and HB T965 are low carbon steels with dual phase manganese and silicon composition. Dual-phase (DP) steel microstructures typically consist of a soft ferrite phase with dispersed islands of a hard martensite phase. The martensite phase is substantially stronger than the ferrite phase. The dual-phase grades, including those with high tensile strengths of 965 MPa (140 ksi), that are designed for forming (DI-FORM), also have low yield-strength-to-tensile-strength ratios to improve formability. This datasheet provides information on microstructure and tensile properties as well as deformation and fatigue. It also includes information on forming and surface treatment. Filing Code: SA-566. Producer or source: Mittal Steel USA Flat Products.

Austenite Formation in Plain Low-Carbon Steels

2010 ◽  
Vol 42 (6) ◽  
pp. 1544-1557 ◽  
Author(s):  
Hamid Azizi-Alizamini ◽  
Matthias Militzer ◽  
Warren J. Poole
Keyword(s):  
Carbon Steels ◽  
Austenite Formation ◽  
Low Carbon ◽  
Low Carbon Steels

The Effects of Heating Rate and Cold Work on the Development of Dual-Phase Steel Microstructures

2014 ◽  
Vol 922 ◽  
pp. 755-760
Author(s):  
L.S. Thomas ◽  
David K. Matlock ◽  
John G. Speer
Keyword(s):  
Heating Rate ◽  
Dual Phase Steel ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
Carbon Steels ◽  
Dual Phase ◽  
Low Carbon ◽  
Heating Rates ◽  
Contributing Factors ◽  
Transformation Temperatures

The effects of heating rate and prior cold work on the development of dual-phase steel microstructures in three low carbon steels were evaluated with samples processed on a Gleeble 3500 thermomechanical processing simulator. The nominally 0.2 wt pct carbon steels included a plain carbon steel and modified alloys incorporating higher manganese contents, boron additions, and microalloy additions. Each alloy was prepared with two different cold rolled reductions. Heating rates from 1 to 1000 oC/s were selected to span the rates typically experienced in conventional furnace heat treating up to rates for induction heating. Critical transformation temperatures were obtained from dilatometric curves. Dual-Phase microstructures after heat treatment with different heating rates were compared. Transformation temperatures decreased with an increase in cold work and increased with an increase in heating rate. The steels with higher manganese and carbon additions exhibited lower Ac3 values across all heating rates and the steels with higher silicon higher Ac1 temperatures across all heating rates. Ac1 increased less than Ac3 with increasing heating rate. The increase in transformation temperatures between 100 and 1000 °C/s was smaller than values exhibited over other increments in heating rate, and decreased in one steel; contributing factors were identified for this behavior.

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