Hot Forging of Semi Solidified High Strength Brass

2006 ◽  
pp. 791-794
Author(s):  
Kyeong Hwan Choe ◽  
Gue Serb Cho ◽  
Kyong Whoan Lee ◽  
K.Y. Kim ◽  
Myung Ho Kim
Keyword(s):  
Hot Forging ◽  
High Strength

scholarly journals Grain Size Evolution and Mechanical Properties of Nb, V–Nb, and Ti–Nb Boron Type S1100QL Steels

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 492
Author(s):  
Jan Foder ◽  
Jaka Burja ◽  
Grega Klančnik
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Hot Forging ◽  
Size Control ◽  
High Strength ◽  
Fatigue Properties ◽  
Titanium Addition ◽  
Austenite Grain Size ◽  
Size Evolution

Titanium additions are often used for boron factor and primary austenite grain size control in boron high- and ultra-high-strength alloys. Due to the risk of formation of coarse TiN during solidification the addition of titanium is limited in respect to nitrogen. The risk of coarse nitrides working as non-metallic inclusions formed in the last solidification front can degrade fatigue properties and weldability of the final product. In the presented study three microalloying systems with minor additions were tested, two without any titanium addition, to evaluate grain size evolution and mechanical properties with pre-defined as-cast, hot forging, hot rolling, and off-line heat-treatment strategy to meet demands for S1100QL steel. Microstructure evolution from hot-forged to final martensitic microstructure was observed, continuous cooling transformation diagrams of non-deformed austenite were constructed for off-line heat treatment, and the mechanical properties of Nb and V–Nb were compared to Ti–Nb microalloying system with a limited titanium addition. Using the parameters in the laboratory environment all three micro-alloying systems can provide needed mechanical properties, especially the Ti–Nb system can be successfully replaced with V–Nb having the highest response in tensile properties and still obtaining satisfying toughness of 27 J at –40 °C using Charpy V-notch samples.

Effect of High Strain-Rate Thermomechanical Processing on Microstructure and Mechanical Properties of Ti-10V-2Fe-3Al Alloy

2013 ◽  
Vol 845 ◽  
pp. 96-100 ◽  
Author(s):  
Piotr Skubisz ◽  
Marek Packo ◽  
Katarzyna Mordalska ◽  
Tadeusz Skowronek
Keyword(s):  
Mechanical Properties ◽  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Thermomechanical Processing ◽  
Hot Forging ◽  
High Strength ◽  
Processing Route ◽  
Microstructure And Mechanical Properties ◽  
Processed Material

Results of beta forging of titanium alloy Ti-10V-2Fe-3Al and subsequent thermal treatment are presented, with analysis of the effect of the processing route on the final mechanical properties, correlated with microstructure of thermomechanically processed material. Investigation of response to high strain-rate hot-forging of microstructure and mechanical properties is focused on the effect of the strengthening mechanisms in the material after two common manners of deformation typical of that alloy. The effect of deformation conditions on final microstructure and mechanical properties was analyzed in three crucial stages of thermomechanical processing, e.i. after deformation, quenching and aging. In result, conclusions were formulated as for processing conditions promoting high strength and/or ductility.

Observation and Analysis of the Microstructures of IGF Refined Low Carbon Microalloyed Non-Tempered Steel

2012 ◽  
Vol 602-604 ◽  
pp. 323-328
Author(s):  
Shu Hua Wang ◽  
Hai Ou Jing ◽  
Le Jin ◽  
Yan Xue
Keyword(s):  
Fine Particles ◽  
Hot Forging ◽  
Steel Structures ◽  
High Strength ◽  
Air Cooling ◽  
Low Carbon ◽  
Carbon Microalloyed ◽  
The Impact ◽  
Tempered Steel ◽  
Strength And Toughness

The IGF refined microalloyed non-tempered steel with high strength and toughness is developed, by adding trace elements such as vanadium and titanium and using aluminum as the deoxidizing elements. The combination of these elements and elements C and N in the steel leads to the precipitation of a great deal of fine and scattered alloy carbides and nitrides. These fine particles provide ideal precipitation positions for IGF’s nucleation. The results show that a lot of IGF appears in the developed steel after hot-forging and air cooling, which effectively divides up the austenite grains and refines the steel structures. The strength and toughness of the steel is increased. The tensile strength reaches 1150Mpa and the impact toughness is between 61.35-65.37J/cm2.

Strengthening a high-strength TiAl alloy by hot-forging

2003 ◽  
Vol 11 (4) ◽  
pp. 299-306 ◽  
Author(s):  
Toshimitsu Tetsui ◽  
Kentaro Shindo ◽  
Satoru Kobayashi ◽  
Masao Takeyama
Keyword(s):  
Tial Alloy ◽  
Hot Forging ◽  
High Strength

Effect of Hot Work on Hardness and Impact Toughness of Heat Treated Low Alloy Steels

2014 ◽  
Vol 1082 ◽  
pp. 197-201
Author(s):  
Mahmoud M. Tash ◽  
Saleh A. Alkahtani ◽  
Khaled A. Abuhasel
Keyword(s):  
Impact Toughness ◽  
Hot Forging ◽  
Weight Ratio ◽  
High Strength ◽  
Extensive Study ◽  
Low Alloy Steels ◽  
Alloying Additions ◽  
Heat Treated ◽  
Alloy Steels ◽  
Effect Of Hot Rolling

The present study was undertaken to investigate the effect of hot work reduction ratio on the hardness and impact toughness of different grades of low alloy steels. The effect of hot rolling and hot forging with different reduction ratios on the hardness and impact toughness properties will be studied. An extensive study will be carried out to investigate the effect of alloying additions and TMT parameters on the hardness and impact toughness of heat-treated low alloy steels. An understanding of the combined effect of TMT and heat treatment on the hardness and impact toughness of the low alloy steels would help in selecting conditions required to achieve optimum mechanical properties and alloy high strength to weight ratio.

Effects of Hot-Forging Process on Combination of Strength and Toughness in Ultra High-Strength TRIP-Aided Martensitic Steels

2011 ◽  
Vol 409 ◽  
pp. 696-701 ◽  
Author(s):  
Junya Kobayashi ◽  
Koh Ichi Sugimoto ◽  
Goro Arai
Keyword(s):  
Retained Austenite ◽  
Hot Forging ◽  
Charpy Impact ◽  
High Strength ◽  
Martensitic Steels ◽  
Structure Matrix ◽  
Transformation Induced Plasticity ◽  
Lath Structure ◽  
Martensitic Lath ◽  
Hot Forging Process

Recently developed ultra high-strength low alloy transformation-induced plasticity (TRIP)-aided steel with martensitic lath structure matrix or "TRIP-aided Martensitic steel; TM steel" possesses a high impact toughness. In this study, to apply the TM steel to some hot-forging parts, the effects of hot-forging on microstructure, retained austenite characteristics, tensile properties and toughness in the TM steels with chemical composition of 0.3-0.4%C, 1.5%Si, 1.5%Mn, 0.002%B, 0.02Ti, 0.05Nb (mass%) were investigated. The hot forging brought on an excellent combinations of tensile strength of 1500-2000 MPa or 0.2% offset proof stress of 1200-1560 MPa and Charpy impact absorbed value of 35-80 J/cm2 when partitioned at 250-350°C after quenching in oil. The combinations exceeded so much those of the conventional quench and tempering structural steels. From examinations of microstructure and retained austenite characteristics, it was found that the excellent combinations are mainly caused by (i) refined and uniform martensitic lath structure matrix with a small amount of carbide, (ii) increasing narrow martensite with high dislocation density and (iii) the increased stability of retained austenite, resulting from the FQP process.

Study on Mechanical Property of 1Cr17/9Cr18MoV Multilayer Composite Armor Plate

2014 ◽  
Vol 941-944 ◽  
pp. 365-369 ◽  
Author(s):  
Jing Tao Han ◽  
Jing Liu
Keyword(s):  
Mechanical Properties ◽  
Composite Plate ◽  
Bending Strength ◽  
Hot Forging ◽  
High Strength ◽  
Tensile Fracture ◽  
Multilayer Composite ◽  
Armor Plate ◽  
Composite Armor ◽  
Multilayer Composite Plate

1Cr17/9Cr18MoV multi-layer composite armor plate with uniform thickness of each layer was fabricated by composite casting, hot forging and hot rolling. Microstructure was observed and mechanical properties of multilayer composite plate after heat treatment were carried out. The results show that the microstructure of each layer is uniform and the interface combination between 1Cr17 and 9Cr18MoV is good at the condition of 950°C/30min, oil cooling + 200°C/30min tempering. The bending strength of multilayer composite plate is greater than each single material and the plasticity is between two materials. Tensile fracture mode of 1Cr17 steel with good plasticity is mainly of ductile dimple fracture and that of 9Cr18MoV steel with high strength is mainly cleavage fracture. The tensile strength of multilayer composite plate is 1410MPa and the hardness of 9Cr18MoV and 1Cr17 is 605.5HV and 566.3HV respectively, the mechanical properties has met the qualification of armor.

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