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.

Isochronal phase transformation of Nb–V–Ti microalloyed ultra-high strength steel upon cooling

2017 ◽  
Vol 125 ◽  
pp. 423-430
Author(s):  
Ji Dong ◽  
Chenxi Liu ◽  
Yongchang Liu ◽  
Xiaosheng Zhou ◽  
Qianying Guo ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Strength Steel ◽  
High Strength ◽  
Ultra High Strength Steel

Effect of Vanadium on the Phase Transformation Behavior of Ti-Mo Microalloyed Ultra-High Strength Steel

2018 ◽  
Vol 89 (9) ◽  
pp. 1800112 ◽  
Author(s):  
Xiaolong Gan ◽  
Gengwei Yang ◽  
Gang Zhao ◽  
Xinping Mao ◽  
Huihui Huang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Strength Steel ◽  
High Strength ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Ultra High Strength Steel

Continuous Cooling Transformation Behavior and the Phase Transformation Model in Low Carbon High Strength Sheet Steel

2014 ◽  
Vol 1035 ◽  
pp. 27-35
Author(s):  
Yu Pei ◽  
Zhe Gao ◽  
Yi Liu ◽  
Shi Qian Zhao ◽  
Chang Yu Xu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
Sheet Steel ◽  
High Strength ◽  
Transformation Model ◽  
Phase Variable ◽  
Low Carbon ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Mathematical Equations

Phase transformation of austenite continuous cooling process in low carbon high strength sheet steel has been researched by DIL805 thermal mechanical simulate. The Austenite continuous cooling transformation (CCT) diagram of steel has been determined by dilatometry and metallography. With the increase of cooling rate, ferritic transformation, perlitic transformation, bainite transformation and martensitic transformation have produced in the organization. Mathematical equations of phase transformation point-cooling rate and phase variable-cooling rate have been established and phase transformation model of high fit degree has been gained by regression calculation. The results show that calculated value and experimental value are nearly similar, so the phase transformation model is feasible.

Phase Transformation Rule, Microstructure and Properties of JG590 High Strength Steel

2007 ◽  
Vol 561-565 ◽  
pp. 29-32
Author(s):  
Yong Feng ◽  
Wei Hua Sun
Keyword(s):  
Tensile Strength ◽  
Phase Transformation ◽  
Yield Strength ◽  
Cooling Rate ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Plates ◽  
Transformation Rule ◽  
Cooling Rates ◽  
Iron And Steel

The phase transformation rule, microstructures and properties of JG590 high strength steel produced in Jinan Iron and Steel Co. ltd. have been investigated in this paper. When the chemical composition of steel are given, the cooling rates after finished rolling affect on the properties of steel greatly. The yield strength and tensile strength increasing, the elongation and reduction of area decreasing as increasing of cooling rates after rolling. The main cause is due to appearance and increasing of Bainite and Martensite other than Ferrite and Pearlite in room temperature. The finished rolling temperature have distinct effects upon the mechanical properties of steel plates. Finished rolling at different temperature with the 0.5°C/s cooling rate, the tensile strength vary in 599-698MPa, the yield strength changed from 412 MPa to 536MPa. The elongation is between 30.4-40.5%. But when finished rolling at different temperature with the 2.0°C/s cooling rate, the tensile strength vary in 747-784MPa, the yield strength changed from 441 MPa to 601MPa. The strength index can both meet the requirements of employ. But the elongation is only 18.7-24.5%. This is related with production of lots of Bainite microstructure more than 2°C/s cooling rate. In the procedure of manufacture of JG590 high steel, the quickly cooling rate should be avoided to keep suitable microstructure and good elongation and toughness.

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