scholarly journals Effect of Ta content on Microstructure and Phase Transformation Temperatures of Ti75.5-Nb25.5 (%at.) Alloy

2021 ◽  
Author(s):  
Safar MOHAMMED ◽  
Fethi DAĞDELEN ◽  
Ibrahim Nazem QADER
Keyword(s):  
Phase Transformation ◽  
Transformation Temperatures

scholarly journals Prediction and measurement of selected phase transformation temperatures of steels

2017 ◽  
Vol 53 (3) ◽  
pp. 391-398 ◽  
Author(s):  
O. Martiník ◽  
B. Smetana ◽  
J. Dobrovská ◽  
A. Kalup ◽  
S. Zlá ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Transformation ◽  
Statistical Evaluation ◽  
Precise Determination ◽  
Experimental Measurements ◽  
Transformation Temperatures ◽  
Literature Research ◽  
Computational Thermodynamic ◽  
Peritectic Transition

The study deals with precise determination of phase transformation temperatures of steel. A series of experimental measurements were carried out by Differential Thermal Analysis (DTA) and Direct Thermal Analysis (TA) to obtain temperatures very close to the equilibrium temperatures. There are presented results from the high temperatures region, above 1000?C, with focus on the solidus temperatures (TS), peritectic transition (TP) and liquidus (TL) of multicomponent steels. The data obtained were verified by statistical evaluation and compared with computational thermodynamic and empirical calculations. The calculations were performed using 15 empirical equations obtained by literature research (10 for TL and 5 for TS), as well as by software InterDendritic Solidification (IDS) and Thermo-Calc (2015b, TCFE8; TC). It was verified that both thermo-analytical methods used are set correctly; the results are reproducible, comparable and close to equilibrium state.

Increasing Hardenability and Hardness of Quenching and Tempering Alloys by Substituting Chromium with Manganese

2021 ◽  
Vol 1016 ◽  
pp. 493-498
Author(s):  
Alexander Gramlich ◽  
Fabian Pape ◽  
Götz Heßling ◽  
Wolfgang Bleck
Keyword(s):  
Phase Transformation ◽  
Chemical Composition ◽  
Industrial Production ◽  
Commercial Software ◽  
Cooling Rates ◽  
Transformation Temperatures ◽  
Jominy Test ◽  
Cooling Speed ◽  
Property Changes ◽  
Quenching And Tempering

This study investigates the influence of the substitution of chromium (-0.8 wt.−%) by manganese (+1.3 wt.−%) in a standard quench and tempering steel and the predictability of property changes through simple simulations, only dependent on the chemical composition. The substitution of chromium by manganese leads to an increased hardness (+50 HV10) and a reduction of the critical cooling speed from 19 K s−1 for the reference alloys to 9 K s−1 for the new alloy and a nearly constant hardness of (600 HV10) after Jominy-test. The commercial software JMATPRO is used to simulate and predict key properties for the industrial production. It is shown that a successful simulation of phase transformation temperatures and the general directions of change can be predicted, but more complex properties like critical cooling rates or hardenability need more sophisticated methods.

Influence of Cr Alloying (1.5 to 5 at.%) on Martensitic Phase Transformation Temperatures in Co-Ni-Ga-Cr Thin Films

2019 ◽  
Vol 5 (1) ◽  
pp. 106-112 ◽  
Author(s):  
Peer Decker ◽  
Jill Fortmann ◽  
Steffen Salomon ◽  
Philipp Krooß ◽  
Thomas Niendorf ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Martensitic Phase ◽  
Martensitic Phase Transformation ◽  
Transformation Temperatures

Influence of the Deep Cryogenic Treatment at the Phase Transformation Temperatures and at the Stabilization of the Cu-14Al-4Ni SMA Alloy

2020 ◽  
Vol 1012 ◽  
pp. 331-336
Author(s):  
Marcelo Nava ◽  
Pedro Cunha de Lima ◽  
Emmanuel Pacheco Rocha Lima
Keyword(s):  
Phase Transformation ◽  
Shape Recovery ◽  
Cryogenic Treatment ◽  
Tool Steels ◽  
Deep Cryogenic Treatment ◽  
Transformation Temperatures ◽  
Thermomechanical Cycling ◽  
Ferrous Metals ◽  
Recovery Capacity ◽  
Non Ferrous Metals

Deep cryogenic treatment (DCT) is industrially applied to improve the wear resistance characteristics of tool steels. However, on non-ferrous metals, the knowledge about the obtained characteristics after DCT is limited. The purpose of this work was to investigate how DCT affects the properties and the behavior of the Cu-14Al-4Ni alloy treated at different times and after thermomechanical cycling was performed. In the present investigation, there was performed a comparative experimental analysis of the transformation temperatures, microhardness and shape recovery capacity of the alloy obtained by smelting, treated by DCT and thermomechanically cycled. The DCT provided the stabilization of the martensitic phase β'1 and, consequently, the stabilization of the phase transformation temperatures and the shape recovery capacity of the shape memory effect of the alloy, increasing the alloy life.

scholarly journals Phase transformation temperatures and Fe enrichment of a 22MnB5 Zn-Fe coated steel under hot stamping conditions

2020 ◽  
Vol 9 (1) ◽  
pp. 629-635 ◽  
Author(s):  
Daniel Alexandre da Costa Ximenes ◽  
Luciano Pessanha Moreira ◽  
José Eduardo Ribeiro de Carvalho ◽  
Duílio Norberto Ferronatto Leite ◽  
Reginaldo Gomes Toledo ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Hot Stamping ◽  
Coated Steel ◽  
Transformation Temperatures
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