scholarly journals Study on mechanical properties and microstructure of DP590 steel with different annealing process

2021 ◽  
Vol 245 ◽  
pp. 03009
Author(s):  
Libo Pan ◽  
Chengjiang Lin ◽  
Wenqiang Zhou ◽  
zhijiang Zuo
Keyword(s):  
Mechanical Properties ◽  
Aging Temperature ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
Tensile Tests ◽  
Annealing Process ◽  
Dp Steel ◽  
Intercritical Annealing Temperature ◽  
Lower Volume

Annealing process is critical to mechanical properties and microstructure of DP steel. For DP steel with strength grade of 590MPa, experiments with different combinations of intercritical annealing temperature and over-aging temperature were carried out during annealing. The tensile tests of the final products and nanohardness tests of different phases were made, and the microstructures were analyzed. The results indicated that higher intercritical annealing temperature was favorable to higher volume fraction of martensite and lower nanohardness of martensite with lower C density. The ultimate tensile strength increased monotonously with the volume fraction of martensite increasing. Higher over aging temperature would make martensite islands be partially resolved and carbides precipitate, which made lower volume fraction of martensite, and resulted in lower nanohardness of martensite. The revealed rules could provide important guide to control material properties of DP steel by manipulating annealing process.

The Effects of Intercritical Annealing Temperature and Initial Microstructure on the Stability of Retained Austenite in a 0.1C-6Mn Steel

2016 ◽  
Vol 879 ◽  
pp. 1847-1852 ◽  
Author(s):  
Katharina Steineder ◽  
Daniel Krizan ◽  
Reinhold Schneider ◽  
Coline Beal ◽  
Christof Sommitsch
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Annealing Temperature ◽  
Intercritical Annealing ◽  
Strong Dependence ◽  
Tensile Tests ◽  
Initial Microstructure ◽  
Intercritical Annealing Temperature ◽  
Batch Annealing ◽  
The Stability

The effects of the intercritical annealing temperature and initial microstructure on the stability of retained austenite were investigated for a 0.1C-6Mn (wt-%) steel. Medium-Mn transformation-induced plasticity (TRIP) steels exhibit a strong dependence of their mechanical properties on the variation of intercritical annealing temperature. This behavior is strongly linked to the amount and stability of the retained austenite. Thus, interrupted tensile tests were used to examine the effect of annealing temperature on the stabilization of the retained austenite. Detailed microstructural investigations were employed to elaborate the effects of its chemical and mechanical stabilization. Furthermore, the final microstructure was varied by applying the batch annealing step to an initial non-deformed and deformed microstructure respectively. Retained austenite stability along with resulting mechanical properties of the investigated medium-Mn TRIP steel was significantly influenced as the amount and morphology of the respective phases altered as a consequence of both initial microstructure and applied intercritical annealing temperature.

Effect of Intercritical Annealing Temperature and Holding Time on Microstructure and Mechanical Properties of Dual Phase Low Carbon Steel

2014 ◽  
Vol 493 ◽  
pp. 721-726 ◽  
Author(s):  
Alfirano ◽  
Wibawa Samdan ◽  
Hidayat Maulud
Keyword(s):  
Carbon Steel ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
Low Carbon Steel ◽  
Growth Rate Constant ◽  
Dual Phase ◽  
Initial Condition ◽  
Low Carbon ◽  
Intercritical Annealing Temperature

Dual phase steels are an important advanced high strength steel, which have been widely used in the automotive industry for vehicle components requiring light weight and safety. In this study, the formation of dual phase structure with various volume fraction of martensite in a low carbon steel SS400 during intercritical annealing were investigated. It was found that intercritical annealing temperature and holding time affected the microstructure and mechanical properties of dual phase low carbon steel. The specimens were heated at intercritical annealing temperature of 750°C, 775°C, 800°C and 825°C, for holding periods of 6-18 minutes, followed by water quenching in order to get a dual phase ferrite and martensite. After quenching, it was obtained the optimal annealing conditions at 800°C with a holding periods of 10 minutes. In this condition, the tensile strength was increased up to 621 N/mm2or 39.24% higher than the initial condition, while the elongation decreased up to 13.8%. The hardness of specimens increased from 127.7 to 235.83 HVN or up to 84.67% higher than the initial condition. Meanwhile the volume fraction of martensite was 24.08%. The higher the temperature of the heating value of grain growth rate constant (K) increases. In addition, at the optimal poin, the value ofK(grain growth rate constant) andn(Avramis exponent) were 0.263 and 0.318, respectively, with activation energy (Q) of 3.98 J/mol.

Effect of Intercritical Annealing Temperature on Martensite Amount for Dual-Phases Steel

2012 ◽  
Vol 548 ◽  
pp. 301-304 ◽  
Author(s):  
Fang Fang ◽  
Yun Yang Yin ◽  
Hui Wang ◽  
Cheng Jiang Lin
Keyword(s):  
Mechanical Properties ◽  
Theoretical Prediction ◽  
Thermodynamic Calculation ◽  
Annealing Temperature ◽  
Intercritical Annealing ◽  
Experimental Results ◽  
Calculated Temperature ◽  
Intercritical Annealing Temperature ◽  
Dp Steels

The theoretical prediction of intercritical annealing temperature for DP steels was conducted by thermodynamic calculation, which agreed to the experimental results. When annealed at 800°Caccording to the calculated temperature of 807°C by setting ratios of α:γ in 70:30, the amount of martensite was 13~18% and the mechanical properties achieved DP590 grade. There was at least 10% to 12% austenite transformed to new ferrite and martensite between intercritical annealing and overaging procedure.

Ultra Fine-Grained 6wt% Manganese TRIP Steel

2010 ◽  
Vol 654-656 ◽  
pp. 286-289 ◽  
Author(s):  
Sea Woong Lee ◽  
Kyoo Young Lee ◽  
Bruno C. De Cooman
Keyword(s):  
Mechanical Properties ◽  
Retained Austenite ◽  
Annealing Temperature ◽  
Volume Fraction ◽  
Intercritical Annealing ◽  
High Volume ◽  
Magnetic Saturation ◽  
Trip Steels ◽  
Fine Grained ◽  
Annealing Temperatures

Ultra-fine grained TRIP steels (UFG-TRIP) containing 6wt%Mn were produced by intercritical annealing. An ultra-fine grained microstructure with a grain size less than 1μm was obtained. The formation mechanism of the high volume fraction of retained austenite was investigated by dilatometry, XRD and magnetic saturation. The fraction of retained austenite was strongly dependent on the annealing temperature. The tensile properties were also found to be strongly influenced by the annealing temperature with poorer mechanical properties being observed at higher annealing temperatures. It was found that the stabilization of the retained austenite was both a composition and size-effect, made possible by the grain refinement due to the reversely transformed martensite.

Thermodynamic Characterization in Intercritical Annealing Process for Dual-Phases Steels

2012 ◽  
Vol 602-604 ◽  
pp. 452-455
Author(s):  
Fang Fang ◽  
Hui Wang ◽  
Yun Yang Yin ◽  
Cheng Jiang Lin
Keyword(s):  
Chemical Composition ◽  
Theoretical Prediction ◽  
Carbon Content ◽  
Annealing Temperature ◽  
Intercritical Annealing ◽  
Annealing Process ◽  
Experimental Results ◽  
Alloying Element ◽  
Thermodynamic Characterization ◽  
Intercritical Annealing Temperature

The theoretical prediction of chemical composition, the range of main elements and austenite alteration affected by intercritical annealing temperature were conducted by thermodynamic calculations, which agree with the experimental results. When fixing carbon content at 0.1% and calculating temperature at 1000K, to achieve α+γ phases without cementite or graphite, Al must be less than 1.13%, Mn be 1.25~7.5% and Mo be less than 0.7%. The calculated Ae3 is 54°C higher than the measured Ac3, and calculated Ae1 is 14°C higher than Ac1. The intercritical annealing temperature for DP590 steels with Al as main alloying element can be calculated by setting ratios of α:γ in 70:30, and the calculated value of 807°C was close to the experimental results of 800~840°C.

scholarly journals Effects of Intercritical Annealing Temperature on Mechanical Properties of Fe-7.9Mn-0.14Si-0.05Al-0.07C Steel

Materials ◽  
2014 ◽  
Vol 7 (12) ◽  
pp. 7891-7906 ◽  
Author(s):  
Xianming Zhao ◽  
Yongfeng Shen ◽  
Lina Qiu ◽  
Yandong Liu ◽  
Xin Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Annealing Temperature ◽  
Intercritical Annealing ◽  
Intercritical Annealing Temperature
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