New insights from crystallography into the effect of refining prior austenite grain size on transformation phenomenon and consequent mechanical properties of ultra-high strength low alloy steel

2019 ◽  
Vol 745 ◽  
pp. 126-136 ◽  
Author(s):  
B.B. Wu ◽  
X.L. Wang ◽  
Z.Q. Wang ◽  
J.X. Zhao ◽  
Y.H. Jin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Alloy Steel ◽  
Prior Austenite ◽  
High Strength ◽  
Low Alloy Steel ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Prior Austenite Grain Size ◽  
Prior Austenite Grain

Carbide composition changes in a low alloy steel

1990 ◽  
Vol 48 (2) ◽  
pp. 420-421
Author(s):  
Z. Larouk ◽  
R. Pilkington
Keyword(s):  
Alloy Steel ◽  
Prior Austenite ◽  
Creep Behaviour ◽  
Low Alloy Steel ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Heat Treated ◽  
Prior Austenite Grain Size ◽  
Composition Changes ◽  
Prior Austenite Grain

Durehete 1055 is a 1%Cr1%Mo¾%V low alloy steel used as bolting material at 565°C. It also contains 0.08%Ti and 0.005%B to improve the creep behaviour, but deleterious properties have been reported, due to the presence of trace elements such as P and Sn. The present work has been an attempt to understand this problem by examining three vacuum melted casts of this steel containing selected additions (wt.%) of 1) 0.08 Ti, 2) 0.08 Ti and 0.02 P; and 3) 0.08 Ti and 0.02 Sn. The material was heat treated for 2h at 980°C, W.Q., and tempered 4h at 680°C, giving a prior austenite grain size of 8 μm. Specimens were then crept for various times at 565°C. After test, metallographic samples were prepared from both the gauge lengths (stressed) and heads (unstressed) to enable the production of carbon extraction replicas. These replicas were examined in a Philips 400T electron microscope, and carbides analysed using EDS.

Influence of Annealing Conditions on the Austenite Size at the End of Soaking

2018 ◽  
Vol 941 ◽  
pp. 562-567 ◽  
Author(s):  
Matthieu Salib ◽  
Irene de Diego Calderon ◽  
Caio Ferreira de Melo ◽  
Luiz Paulo Mendonca e Silva ◽  
Artem Arlazarov
Keyword(s):  
Grain Size ◽  
Prior Austenite ◽  
High Strength Steels ◽  
High Strength ◽  
Austenite Grain Size ◽  
Austenite Grain ◽  
Wide Range ◽  
Prior Austenite Grain Size ◽  
Prior Austenite Grain ◽  
Soaking Temperature

Influence of chemical composition (C, Mn and Nb) and soaking temperature on the evolution of austenite grain size from a cold-rolled microstructure was studied on several Advanced High Strength Steels. A wide range of soaking temperatures was used to perform the heat treatments. Characterization of prior austenite grain size from the annealed samples using optical and confocal microscopes, Scanning Electron Microscope and Electron Back-Scattered Diffraction. Comparison of different methods was done to validate the methodology and the results were quite satisfactory. Concomitant effects of Manganese, Niobium, Carbon and of soaking temperature on the prior austenite grain size were analyzed and discussed. Important effect of Mn and Nb was underlined.

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