Formation of Ferrite with Cr Equivalents and Solidification Rates in Mod. (9-12)Cr-1Mo Steels

2007 ◽  
Vol 124-126 ◽  
pp. 1497-1500
Author(s):  
Y.H. Kim ◽  
H.C. Kim ◽  
Yeon Gil Jung ◽  
J.H. Lee ◽  
B.H. Chi ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Liquid Interface ◽  
Solidification Microstructure ◽  
Composition Change ◽  
Heat Treated ◽  
Solid Liquid Interface ◽  
Solid Liquid

The influence of solidification rates and Cr equivalents on the formation of the ferrite was studied by directional solidification in mod. (9-12)Cr-1Mo steels. It was found that the volume fraction of ferrite increased as increasing Cr equivalent and solidification rate. The volume fraction of the ferrite showed much higher at low solidification rates with the planar or cellular interface than that at high solidification rates with the dendritic interface. The volume fraction of ferrite in solidification microstructure showed much higher than that in extruded and heat-treated alloys. It depends on not only solidification rate and Cr equivalent but also the solidification fraction. At low solidification rates, there occurs segregation because the solid/liquid interface was planar or cellular, and it makes composition change with solidification fractions. The formation of ferrite has been discussed with Cr equivalent and solidification rate.

scholarly journals Solidification Front of Oriented Ledeburite

2016 ◽  
Vol 16 (1) ◽  
pp. 124-130 ◽  
Author(s):  
M. Trepczyńska-Łent ◽  
E. Olejnik
Keyword(s):  
Directional Solidification ◽  
Solidification Front ◽  
Liquid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Interface Structures

Abstract Directional solidification of the Fe - 4,3 wt % C alloy was performed with the pulling rate equal to v=83 μm/s. Sample was frozen during solidification to reveal the shape of the solid/liquid interface. Structures eutectic pyramid and spherolitic eutectic were observed. The solidification front of ledeburite eutectic was revealed. The leading phase was identified and defined.

Influence of initial solid–liquid interface morphology on further microstructure evolution during directional solidification

2012 ◽  
Vol 110 (2) ◽  
pp. 443-451 ◽  
Author(s):  
Dongmei Liu ◽  
Xinzhong Li ◽  
Yanqing Su ◽  
Jingjie Guo ◽  
Liangshun Luo ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Microstructure Evolution ◽  
Liquid Interface ◽  
Interface Morphology ◽  
Solid Liquid Interface ◽  
Solid Liquid

In-situ observation of solid-liquid interface during directional solidification of succinonitrile and pivalic acid

2005 ◽  
Vol 16 (1-4) ◽  
pp. 107-110
Author(s):  
A. P. Shpak ◽  
O. P. Fedorov ◽  
E. L. Zhivolub ◽  
Y. J. Bersudskyy ◽  
O. V. Shuleshova
Keyword(s):  
Directional Solidification ◽  
Pivalic Acid ◽  
Liquid Interface ◽  
In Situ Observation ◽  
Solid Liquid Interface ◽  
Solid Liquid

Phase-Field Microstructure Solidification of Al–2 wt% Si Alloys

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
J. B. Allen
Keyword(s):  
Directional Solidification ◽  
Phase Field ◽  
Maximum Concentration ◽  
Dendritic Growth ◽  
Interface Energy ◽  
Liquid Interface ◽  
Two Dimensional ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Dilute Alloy

In this work, we develop one- and two-dimensional phase-field simulations to approximate dendritic growth of a binary Al–2 wt% Si alloy. Simulations are performed for both isothermal as well as directional solidification. Anisotropic interface energies are included with fourfold symmetries, and the dilute alloy assumption is imposed. The isothermal results confirm the decrease in the maximum concentration for larger interface velocities as well as reveal the presence of parabolic, dendrite tips evolving along directions of maximum interface energy. The directional solidification results further confirm the formation of distinctive secondary dendritic arm structures that evolve at regular intervals along the unstable solid/liquid interface.

Effect of Boron on Solidification Microstructure in a Single Crystal Superalloy

2005 ◽  
Vol 486-487 ◽  
pp. 460-463 ◽  
Author(s):  
Chang Yong Jo ◽  
D.H. Kim ◽  
Yeong Seok Yoo ◽  
D.H. Ye ◽  
Jung Hun Lee
Keyword(s):  
Single Crystal ◽  
Grain Boundaries ◽  
Directional Solidification ◽  
Melting Temperature ◽  
Liquid Interface ◽  
Solidification Behavior ◽  
Optimum Amount ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Solidification Microstructures

Carbon and boron were mainly considered to strengthen grain boundaries formed during single crystal casting of complex shaped components. However, those elements cause segregation forming the phase with low melting temperature or with brittle nature. To determine the optimum amount of these elements, the effect of boron on solidification behavior was investigated in the C doped single crystal RR 2072 alloy. The solid/liquid interface morphologies and the solidification microstructures were studied at various solidification rates and with B addition by directional solidification.

Study on the Solidification Microstructure of Aluminum Alloyed High Speed Steel

2011 ◽  
Vol 217-218 ◽  
pp. 463-467 ◽  
Author(s):  
Xue Feng Zhou ◽  
Xiao Yan Yin ◽  
Feng Fang ◽  
Jian Qing Jiang
Keyword(s):  
Crystal Structure ◽  
High Speed ◽  
High Speed Steel ◽  
Interface Structure ◽  
Liquid Interface ◽  
Solidification Microstructure ◽  
Eutectic Carbides ◽  
M2 High Speed Steel ◽  
Solid Liquid Interface ◽  
Solid Liquid

The present work has investigated the effect of aluminum on the solidification microstructure of M2 high speed steel. The results show that the as-cast structure is refined and the networks of M2C eutectic carbides are distributed more homogeneously with the addition of aluminum. Meanwhile, the morphology of M2C changes from the fibrous shape to the plate-like one. Despite of the same crystal structure, the microstructure differs greatly between the two carbides. Compared with the fibrous M2C, micro-twining is formed in the plate-like M2C, resulting in the orientation changes between different plates. It is expected that the solid/liquid interface structure of M2C may evolve from the non-faceted into the faceted due to the addition of aluminum.

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