Study of equilibrium and nonequilibrium phase transformations temperatures of steel by thermal analysis methods

Kawuloková, Monika; Smetana, Bedřich; Zlá, Simona; Kalup, Aleš; Mazancová, Eva; Váňová, Petra; Kawulok, Petr; Dobrovská, Jana; Rosypalová, Silvie

doi:10.1007/s10973-016-5780-4

Cited by 17 publications

(11 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the structure of the industrial polycrystalline samples is uniform, and the dilatation is homogeneous and pronounced during phase transformation, so the thermal dilatation method is often used to measure the phase transformation behavior of alloys with diffusion transformation. [ 19–23 ] However, for shear‐type martensitic transformation, the thermal dilatation method is not effective, because shear transformation has strong directionality, and the volume does not obviously change with temperature, and the dilatational amount measured from different directions varies greatly. [ 24,25 ] Currently, the influence of grain size on diffusion transformation and the columnar‐grained phase transformation behavior on the transformation temperature has been seldom reported.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Initial Columnar‐Grained Inhomogeneity of Electrical Steels on the Transformation Temperature

Yang

et al. 2021

steel research int.

View full text Add to dashboard Cite

The effects of various initial structures and heating and cooling rates on the columnar‐grained transformation temperature are studied by a thermal dilatometer and electron backscatter diffraction. The results show that deformation can reduce the thermal hysteresis more effectively than decrease the heating rate, and the phase transformation hysteresis of the deformed sample is the smallest during heating, followed by the columnar‐grained sample with a slow heating rate, whereas the columnar‐grained sample with a fast heating rate has the largest phase transformation hysteresis. Moreover, the dilatational amount changes greatly with cooling rate. The coarse columnar grains can severely restrain dilatation. The smaller dilatational amount is related to the incomplete phase transformation of the columnar grains and also related to the suppression of the dilatational amount of the small grains by the surrounding columnar grains. In contrast, the largest dilatational amount is caused by the relatively sufficient phase transformation. In addition, the changes of the transformation temperature and the dilatational amount are mainly induced by the grain size effect and the inhomogeneity of the structures, but {100} texture can affect the uniformity of grain size.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of the Initial Columnar‐Grained Inhomogeneity of Electrical Steels on the Transformation Temperature

Yang

et al. 2021

steel research int.

View full text Add to dashboard Cite

show abstract

“…Important temperatures for steel heating and cooling can be determined mathematically or using simulations in specially developed software products; for example, IDS (version 2.0.0, Laboratory of Metallurgy, Helsinky University of Technology, Helsinky, Finland), Thermo-calc, QTSteel, JMatPro and so on. [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…The second approach is the possibility of using physical simulations or measurements which are performed on sophisticated laboratory devices. The solidus and liquidus temperatures and another transformation temperatures of iron, steel and other alloys can be determined, for example, by the use of differential thermal analysis (DTA), with the help of differential scanning calorimetry (DSC), or with the use of thermal-derivative analysis (TDA) [1,21,[26][27][28][29][30]. However, when considering the dimensions and possible chemical and structural inhomogeneity of the analyzed sample, it is very difficult to precisely determine the solidus temperature with the use of the sophisticated DTA and DSC methods [1,7,18,28,31].…”

Section: Introductionmentioning

confidence: 99%

The Relationship between Nil-Strength Temperature, Zero Strength Temperature and Solidus Temperature of Carbon Steels

Kawulok

Schindler

Smetana

et al. 2020

Metals

Self Cite

View full text Add to dashboard Cite

The nil-strength temperature, zero strength temperature and solidus temperature are significant parameters with respect to the processes of melting, casting and welding steels. With the use of physical tests performed on the universal plastometer Gleeble 3800 and calculations in the IDS software, the nil-strength temperatures, zero strength temperatures and solidus temperatures of nine non-alloy carbon steels have been determined. Apart from that, solidus temperatures were also calculated by the use of four equations expressing a mathematical relation of this temperature to the chemical composition of the investigated steels. The nil-strength and zero strength temperatures and the solidus temperatures decreased with increasing carbon content in the investigated steels. Much higher content of sulfur in free-cutting steel resulted in a decrease of all the temperatures investigated. The zero strength temperatures determined by calculation in the IDS software during solidification were approximately 43–85 °C higher than the nil-strength temperatures determined experimentally during heating of the investigated steels. The linear dependence of experimentally measured nil-strength temperature on the calculated zero strength temperature for the investigated steels was determined. Based on regression analyses, there were determined mathematical relations which described with high accuracy a linear dependence of the nil-strength and zero strength temperatures on the solidus temperature of the investigated steels.

show abstract

“…Although S34MnV is a widely used steel material in heavy crankshafts, very little research has been done on the material. So far, the temperatures of phase transformations, the effects of different heat treatments on the microstructure, and the mechanical properties of S34MnV have been identified . The only study on the hot deformation behavior of the steel has been done by Sun et al They were able to establish a constitutive equation and a grain growth mathematical model of S34MnV, which can be used to simulate and analyze the bending process of large marine crankthrows…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior and Processing Maps for a Large Marine Crankshaft S34MnV Steel

Chen

Nash

2017

steel research int.

View full text Add to dashboard Cite

The hot deformation behavior of S34MnV steel is investigated by means of hot compression tests at temperatures between 1223 and 1473 K (950 to 1200 C) and strain rates of 0.05-2 s À1 . Hyperbolic sine type of constitutive equation is established. The activation energy Q is 321.943 kJ mol À1 , near to the austenite lattice self-diffusion activation energy. The processing maps under different strains are constructed based on the dynamic materials model (DMM) and Prasad's instability criterion. The instability regions vary as the strain increases. The flow instability with a strain of 0.7 approximately happens at the lower temperature 1223-1398 K (950-1125 C) and higher strain rate 0.2-2 s À1 . Figure 6. Processing maps for S34MnV steel at different strains: a) 0.1, b) 0.3, c) 0.5, and d) 0.7. www.advancedsciencenews.com www.steel-research.de steel research int. 2018, 89, 1700321

show abstract

Study of equilibrium and nonequilibrium phase transformations temperatures of steel by thermal analysis methods

Cited by 17 publications

References 10 publications

Effect of the Initial Columnar‐Grained Inhomogeneity of Electrical Steels on the Transformation Temperature

Effect of the Initial Columnar‐Grained Inhomogeneity of Electrical Steels on the Transformation Temperature

The Relationship between Nil-Strength Temperature, Zero Strength Temperature and Solidus Temperature of Carbon Steels

Hot Deformation Behavior and Processing Maps for a Large Marine Crankshaft S34MnV Steel

Contact Info

Product

Resources

About