Extremely high temperature carbide precipitation induced intragranular acicular ferrite transformation of M2 steel during semi-solid cooling

2021 ◽  
pp. 131516
Author(s):  
Yongjin Wang ◽  
Siyao Bi ◽  
Renbo Song ◽  
Jun Yanagimoto ◽  
Tom Taylor
Keyword(s):  
High Temperature ◽  
Acicular Ferrite ◽  
Carbide Precipitation ◽  
Ferrite Transformation ◽  
Intragranular Acicular Ferrite ◽  
Semi Solid

scholarly journals A Comparative Study of Acicular Ferrite Transformation Behavior between Surface and Interior in a Low C–Mn Steel by HT-LSCM

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 699
Author(s):  
Xiaojin Liu ◽  
Guo Yuan ◽  
Raja. Devesh Kumar Misra ◽  
Guodong Wang
Keyword(s):  
Grain Boundaries ◽  
Cooling Rate ◽  
Acicular Ferrite ◽  
Laser Scanning ◽  
Sample Surface ◽  
Surface Microstructure ◽  
In Situ Observation ◽  
Low Carbon ◽  
Transformation Behavior ◽  
Ferrite Transformation

In this study, the acicular ferrite transformation behavior of a Ti–Ca deoxidized low carbon steel was studied using a high-temperature laser scanning confocal microscopy (HT-LSCM). The in situ observation of the transformation behavior on the sample surface with different cooling rates was achieved by HT-LSCM. The microstructure between the surface and interior of the HT-LSCM sample was compared. The results showed that Ti–Ca oxide particles were effective sites for acicular ferrite (AF) nucleation. The start transformation temperature at grain boundaries and intragranular particles decreased with an increase in cooling rate, but the AF nucleation rate increased and the surface microstructure was more interlocked. The sample surface microstructure obtained at 3 °C/s was dominated by ferrite side plates, while the ferrite nucleating sites transferred from grain boundaries to intragranular particles when the cooling rate was 15 °C/s. Moreover, it was interesting that the microstructure and microhardness of the sample surface and interior were different. The AF dominating microstructure, obtained in the sample interior, was much finer than the sample surface, and the microhardness of the sample surface was much lower than the sample interior. The combined factors led to a coarse size of AF on the sample surface. AF formed at a higher temperature resulted in the coarse size. The available particles for AF nucleation on the sample surface were quite limited, such that hard impingement between AF plates was much weaker than that in the sample interior. In addition, the transformation stress in austenite on the sample surface could be largely released, which contributed to a coarser AF plate size. The coarse grain size, low dislocation concentration and low carbon content led to lower hardness on the sample surface.

scholarly journals High temperature compression behavior of the solid phase resulting from drained compression of a semi-solid 6061 alloy

2012 ◽  
Vol 532 ◽  
pp. 37-43 ◽  
Author(s):  
E. Giraud ◽  
M. Suéry ◽  
M. Coret
Keyword(s):  
High Temperature ◽  
Solid Phase ◽  
Compression Behavior ◽  
Semi Solid

Comparative Evaluation of TiN/CrN, AlN/CrN, TiAlN/CrN Multilayer Films for the Use of Semi-Solid Processing of Cu Alloys

2006 ◽  
Vol 116-117 ◽  
pp. 124-127 ◽  
Author(s):  
Sang Yong Lee ◽  
Sang Yul Lee
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
Multilayer Coatings ◽  
Closed Field ◽  
Unbalanced Magnetron Sputtering ◽  
Cu Alloys ◽  
Unbalanced Magnetron ◽  
Nanoindentation Hardness ◽  
Semi Solid ◽  
Superlattice Period

In order to investigate the effect of PVD coatings on the performance of proto-type high temperature mold and to identify the best candidate thin films for Cu semi-solid processing, TiAlN/CrN multilayer coatings with various superlattice periods was synthesized using a closed field unbalanced magnetron sputtering method with separate Cr and TiAl and characteristics of these films were compared with those from TiN/CrN and AlN/CrN films in terms of microstructure, nanoindentation hardness, and oxidation test at 900 in air. TiN/CrN film showed the best mechanical properties but their oxidation resistance, the most critical property for high temperature semi-solid processing was the poorest. Therefore TiAlN films with a superlattice period of 6.1nm which has intermediate plastic deformation resistance with the best oxidation resistance were considered to be the best candidate out of three different films studied in this work.

Effect of Mg addition on formation of intragranular acicular ferrite in heat-affected zone of steel plate after high-heat-input welding

2018 ◽  
Vol 25 (4) ◽  
pp. 433-441 ◽  
Author(s):  
Long-yun Xu ◽  
Jian Yang ◽  
Rui-zhi Wang ◽  
Wan-lin Wang ◽  
Yu-nan Wang
Keyword(s):  
Heat Affected Zone ◽  
Heat Input ◽  
Acicular Ferrite ◽  
Steel Plate ◽  
High Heat ◽  
High Heat Input ◽  
Mg Addition ◽  
Intragranular Acicular Ferrite

In situ observation of the formation of intragranular acicular ferrite at non-metallic inclusions in C–Mn steel

2010 ◽  
Vol 58 (4) ◽  
pp. 1369-1378 ◽  
Author(s):  
Di Zhang ◽  
Hidenori Terasaki ◽  
Yu-ichi Komizo
Keyword(s):  
Acicular Ferrite ◽  
In Situ Observation ◽  
Metallic Inclusions ◽  
Intragranular Acicular Ferrite ◽  
Mn Steel

A Review of Haynes® 230 and Haynes 617 Alloys for High Temperature Gas Cooled Reactors

2007 ◽  
Author(s):  
Michael Katcher ◽  
Dwaine L. Klarstrom
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Grain Boundary ◽  
Creep Strength ◽  
Thermal Fatigue ◽  
Low Cycle Fatigue ◽  
Carbide Precipitation ◽  
Cooling Rates ◽  
High Temperature Gas

HAYNES 230 and 617 alloys are competing for use on Generation IV, high temperature gas cooled reactor components because of their good high temperature creep strength in the temperature range of 760°C and 982°C and resistance to attack in the gas cooled reactor environment. A review of the metallurgy affecting the properties in each alloy is provided. It is shown that the grain size and carbide precipitation developed during manufacture affect short term and long term ductility, fatigue life, and creep strength. For example, 230 alloy has a finer grained structure which promotes fatigue strength with a slight sacrifice in creep strength. The 617 alloy has a coarser grain structure which provides slightly higher creep resistance while sacrificing some fatigue strength. Thermal aging also introduces gamma prime precipitation to 617 alloy in addition to grain boundary carbides. This, along with grain boundary oxidation, reduces the low cycle fatigue strength of 617 alloy compared to 230 alloy. Independent studies have shown that 230 alloy possesses higher resistance to thermal fatigue than 617 alloy. However, welds of both base metals with similar weld composition have about the same thermal fatigue life. Cooling rates from solution annealing temperatures during processing affect the ductility and creep strength of these alloys with the highest cooling rates preferred for retention of ductility and creep strength. Slow cooling rates promote carbide precipitation in the grain boundaries which reduces ductility and creep strength.

Austenite to polygonal-ferrite transformation and carbide precipitation in high strength low alloy steel

2017 ◽  
Vol 108 (1) ◽  
pp. 12-19
Author(s):  
Xiaosheng Zhou ◽  
Ji Dong ◽  
Yongchang Liu ◽  
Chenxi Liu ◽  
Liming Yu ◽  
...  
Keyword(s):  
Alloy Steel ◽  
High Strength ◽  
Carbide Precipitation ◽  
Polygonal Ferrite ◽  
Low Alloy Steel ◽  
Ferrite Transformation

Application of PVD Coatings for Improvement of Die Performance in Copper Semi-Solid Processing

2006 ◽  
Vol 116-117 ◽  
pp. 84-87 ◽  
Author(s):  
Sang Yong Lee ◽  
Sang Yul Lee
Keyword(s):  
High Temperature ◽  
Protective Coatings ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
H13 Steel ◽  
Crn Coating ◽  
Aisi H13 ◽  
Improved Performance ◽  
Semi Solid ◽  
Superlattice Period

TiAlN/CrN multilayer coatings with an superlattice period of 6.1nm was applied to a proto-type high temperature segment mold for Cu semi-solid processing so that it was investigated the possibilities of TiAlN/CrN multilayer coating as a candidate protective coatings to extend the lifetime of high temperature molds and dies. Much improved performance was obtained from the TiAlN/CrN coated molds, although different behaviors were observed depending upon the type of substrate mold materials. . Improvement of mold performance was observed by TiAlN/CrN coating on AISI H13 steel, but TZM alloy with TiAlN/CrN coating was found to be the best candidate as a mold for high temperature Cu semi-solid processing.

scholarly journals Conditions for the occurrence of acicular ferrite transformation in HSLA steels

2017 ◽  
Vol 53 (5) ◽  
pp. 3785-3804 ◽  
Author(s):  
H. Zhao ◽  
B. P. Wynne ◽  
E. J. Palmiere
Keyword(s):  
Acicular Ferrite ◽  
Ferrite Transformation ◽  
Hsla Steels
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