On the Significant Impact of Deformation Coupled with Cooling Rate during Thermo‐Mechanical Controlled Processing (TMCP) on Microstructure‐Property Relationship in 25Mn2Si2Cr High Strength Steel

2019 ◽  
Vol 90 (8) ◽  
pp. 1900134 ◽  
Author(s):  
Ji Li ◽  
Zhunli Tan ◽  
Min Zhang ◽  
Guhui Gao ◽  
Raja Devesh Kumar Misra ◽  
...  
Keyword(s):  
Cooling Rate ◽  
High Strength Steel ◽  
High Strength ◽  
Property Relationship ◽  
Controlled Processing

The Influence of Thermomechanical Controlled Processing on Bainite Formation in Low Carbon High Strength Steel

2014 ◽  
Vol 783-786 ◽  
pp. 21-26
Author(s):  
Xiao Jun Liang ◽  
Ming Jian Hua ◽  
Anthony J. DeArdo
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Manganese Steel ◽  
Low Carbon ◽  
High Manganese ◽  
Bainite Transformation ◽  
High Manganese Steel ◽  
Cooling Rates ◽  
Controlled Processing

Thermomechanical controlled processing is a very important way to control the microstructure and mechanical properties in low carbon, high strength steel. This is especially true in the case of bainite formation, where the complexity of the austenite-bainite transformation makes the control of the processing important. In this study, a low carbon, high manganese steel containing niobium was investigated to better understand the roles of austenite conditioning and cooling rates on the bainitic phase transformation. Specimens were compared with and without deformation, and followed by seven different cooling rates ranging between 0.5°C/s and 40°C/s. The CCT curves showed that the transformation behaviors and temperatures are very different. The different bainitic microstructures which varied with austenite deformation and cooling rates will be discussed.

3D FEM Simulation of the Effect of Cooling Rate on SDAS and Macrosegregation of a High Strength Steel

2018 ◽  
Vol 941 ◽  
pp. 2360-2364 ◽  
Author(s):  
Gary Brionne ◽  
Abdelhalim Loucif ◽  
Chun Ping Zhang ◽  
Louis Philippe Lapierre-Boire ◽  
Mohammad Jahazi
Keyword(s):  
Boundary Conditions ◽  
Mushy Zone ◽  
Cooling Rate ◽  
High Strength Steel ◽  
Fem Simulation ◽  
High Strength ◽  
3D Fem ◽  
Cooling Rates ◽  
Positive Segregation ◽  
The Difference

Secondary dendrite arm spacing (SDAS) is a macrosegregation parameter directly linked to content of macrosegregation through cooling rates. The aim of this paper is to highlight the effect of cooling rate on the SDAS and macrosegregation patterns in a high strength steel. For this purpose, directionnal solidification in a cylinder was modeled with a plane-front solidification. Two cylinders were modeled with different boundary conditions (Tsurface = 1000°C and 1200°C). Using the FEM software Thercast, 3D macrosegregation maps were generated with thermomechanic algorithm taking into account metal shrinkage. Using Won’s equation, the influence of cooling rates in the mushy zone on SDAS was determined. The results indicated that a 72% lower difference in the area of negative macrosegregation zone (macrosegregation ratio (rseg) < -0.016%) for lower cooling rate (Ts = 1200°C). The difference of the area for positive segregation was 85% lower for higher cooling rates.

Investigation of the High Strength Steel Al-Si Coating during Hot Stamping Operations

2009 ◽  
Vol 410-411 ◽  
pp. 289-296 ◽  
Author(s):  
Francesca Borsetto ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Surface Roughness ◽  
Cooling Rate ◽  
High Strength Steel ◽  
Room Temperature ◽  
Heating Temperature ◽  
Hot Stamping ◽  
High Strength ◽  
Tribological Behaviour ◽  
Metal Sheets ◽  
Coating Characteristics

To improve the low formability that HSS sheets exhibit at room temperature, innovative forming technologies like the hot stamping process are currently applied. In order to avoid scaling and decarburization during the heating step, metal sheets coated with a specially developed Al-Si coating are utilized. In the present work the coating characteristics in terms of morphology, surface roughness and tribological behaviour are investigated as function of heating temperature, holding time and cooling rate that are typical of hot stamping processes.

Influence of cooling rate on tensile behaviour of S690Q high strength steel butt joint

2020 ◽  
Vol 173 ◽  
pp. 106258
Author(s):  
Cheng Chen ◽  
Sing-Ping Chiew ◽  
Ming-Shan Zhao ◽  
Chi-King Lee ◽  
Tat-Ching Fung
Keyword(s):  
Cooling Rate ◽  
High Strength Steel ◽  
High Strength ◽  
Butt Joint ◽  
Tensile Behaviour

Principle and Model of Phase Transformation in Ultra-High Strength Steel for Cone Crusher

2016 ◽  
Vol 850 ◽  
pp. 636-641
Author(s):  
Wei Wang ◽  
Ren Bo Song ◽  
Shi Guang Peng ◽  
Ru Wen Zheng ◽  
Zhi Dong Tan ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
High Strength Steel ◽  
High Strength ◽  
Lower Bainite ◽  
Transformation Model ◽  
Expansion Curve ◽  
Ultra High Strength Steel ◽  
Cone Crusher ◽  
High Degree

The principle of phase transformation in ultra-high strength steel for cone crusher was studied by DIL805 thermal mechanical simulate, and the critical temperature was determined. The Austenite continuous cooling transformation (CCT) diagram of the steel was confirmed by thermal expansion curve, dilatometry and metallography. The phase transformation model was established and offered a theory for deciding parameters of heat treatment process. The results proved that: when the cooling rate was under 0.5 °C/s, the structure was mainly Pearlite and Bainite. With the increase of cooling rate, the content of lower Bainite increased. When it came to 1°C/s , Martensite start to transform from Austenite. When the cooling rate is 5°C/s, Pearlite disappears, Bainite and Martensite were in the majority. Meanwhile, the mathematical equations of phase transformation have high degree to fit the experimental results, and the phase transformation model is feasible.

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