Effect of cooling rate on phase transformation behavior during isothermal annealing of SCr420 steel

2022 ◽  
Author(s):  
Jae-Young Park ◽  
Won-Seok Ko ◽  
Ki Beom Park ◽  
Gyu Byeong Kang ◽  
Hyeon-Tae Im ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
Isothermal Annealing ◽  
Transformation Behavior ◽  
Phase Transformation Behavior

Phase Transformation Behavior of Niobium Containing Microalloyed Steel with Predeformation and Continuous Cooling

2014 ◽  
Vol 804 ◽  
pp. 281-284
Author(s):  
Yuan She ◽  
Zhao Hui Zhang ◽  
Jian Tao Ju ◽  
Bo Jin
Keyword(s):  
Phase Transformation ◽  
Cooling Rate ◽  
Microalloyed Steel ◽  
Stored Energy ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
Continuous Cooling ◽  
Cooling Phase ◽  
Niobium Microalloyed Steel ◽  
Change Of Microstructure

The continuous cooling phase transformation behavior of niobium microalloyed steel was studied by Thermecmastor-Z thermomechanical simulator; the continuous cooling transformation curves (CCT) were established. The change of microstructure under different cooling rates was observed, and the influence of deformation in austenite non-recrystallization region on transformation was discussed. Based on these work, it was possible to know that the phase transformation is retarded and the ferritic grain is refined dramatically as the cooling rate increasing. The deformation in austenite non-recrystallization region caused deformation stored-energy, which improved the grain refinement of transformation to some extent, but not significant.

scholarly journals Dilatometric study of the phase transformations under conditions of recrystallized and non-recrystallized austenite in 3Mn–1.5Al steel

2020 ◽  
Author(s):  
M. Morawiec ◽  
A. Grajcar ◽  
A. Kozłowska ◽  
W. Zalecki ◽  
W. Burian
Keyword(s):  
Phase Transformation ◽  
Dislocation Density ◽  
Cooling Rate ◽  
Heat Treatments ◽  
Manganese Steel ◽  
Recrystallization Process ◽  
Transformation Behavior ◽  
Cooling Rates ◽  
Phase Transformation Behavior ◽  
Different Temperatures

AbstractThis work presents the results of prior austenite state on the phase transformation behavior in a medium manganese steel alloyed with Al. The austenite was plastically deformed at two different temperatures. The first was at 1050 °C to ensure its recrystallization before cooling. The second treatment included deformation at 900 °C to keep high dislocation density in the austenite. The analysis of recrystallization process or its lack on the phase transformation behavior was analyzed. The study included thermodynamic calculations to analyze proper conditions of selected heat treatments. The dilatometric analysis of the phase transitions dependence on deformation temperatures was carried out. Deformation continuous cooling transformation diagrams were formed on this basis. The metallographic investigations were performed to determine microstructure constituents after cooling. The investigation proved the presence of ferrite untransformed during the austenitization step at 1100 °C. The dominant phase was bainite which was kept present up to 100 °C s−1 cooling rate. The amount of martensite increased with increasing the cooling rate. For the non-recrystallized austenite, more bainite was present in the microstructure for higher cooling rates compared to the recrystallized one. This was the result of higher density of preferable places for bainite nucleation in the non-recrystallized austenite. The Vickers hardness measurements were conducted after the applied heat treatments. The hardness of steel increased together with applying the higher cooling rates, which corresponded to the higher martensite amount. These values were higher for the non-recrystallized austenite because of higher dislocation density.

Evolution of Phase Transformation Behavior in Li(Mn1.5Ni0.5)O4 Cathodes Studied By In Situ XRD

2011 ◽  
Vol 158 (8) ◽  
pp. A890 ◽  
Author(s):  
Kevin Rhodes ◽  
Roberta Meisner ◽  
Yoongu Kim ◽  
Nancy Dudney ◽  
Claus Daniel
Keyword(s):  
Phase Transformation ◽  
Transformation Behavior ◽  
Phase Transformation Behavior ◽  
In Situ Xrd

Cracking and Phase Transformation in Silicon During Nanoindentation

2003 ◽  
Vol 795 ◽  
Author(s):  
Jae-il Jang ◽  
Songqing Wen ◽  
M. J. Lance ◽  
I. M. Anderson ◽  
G. M. Pharr
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transformation ◽  
Single Crystals ◽  
Transformation Behavior ◽  
Amorphous Phases ◽  
Phase Transformation Behavior ◽  
Wide Range ◽  
Load Displacement ◽  
Indenter Geometry

ABSTRACTNanoindentation experiments were performed on single crystals of (100) Si using a series of triangular pyramidal indenters with centerline-to-face angles in the range 35.3° to 85.0°. The influences of the indenter geometry on cracking and phase transformation during indentation were systematically studied. Although reducing the indenter angle reduces the threshold load for cracking and increases the crack lengths, c, at a given indention load, P, the frequently observed relation between P and c3/2 is maintained for all of the indenters over a wide range of load. Features in the nanoindentation load-displacement curves in conjunction with Raman spectroscopy of the crystalline and amorphous phases in and around the contact impression show that the indenter geometry also plays a role in the phase transformation behavior. Results are discussed in relation to prevailing ideas about indentation cracking and phase transformation in silicon.

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