Influences of Severe Deformation and Alloy Modification on Secondary Hardening and Fracture Behavior

2005 ◽  
Vol 475-479 ◽  
pp. 183-186 ◽  
Author(s):  
Ho Sup Sim ◽  
K.S. Lee ◽  
Kon Bae Lee ◽  
Hyung Ryul Yang ◽  
Hoon Kwon
Keyword(s):  
High Temperature ◽  
Impact Toughness ◽  
Fracture Behavior ◽  
Secondary Hardening ◽  
Direct Quenching ◽  
Severe Deformation ◽  
Intergranular Embrittlement ◽  
Cr Addition ◽  
Aging Kinetics ◽  
Kinetics Of

Secondary hardening and fracture behavior in the high Co-Ni steels containing W, has been studied in terms of severe deformation, Cr addition, and austenite condition. Two kinds of Co- Ni steels, containing the only W(W steel), and the W and Cr(WCr steel), were severely rolled and followed by direct quenching(DQ). In comparison with undeformed specimens, reaustenitizing( RA) was performed. DQ specimens exhibited higher impact toughness as well as higher hardness, as compared to RA specimens. The aging kinetics of the WCr steel was accelerated due to the Cr addition. While the W steel showed the intergranular embrittlement in the high temperature RA condition, in addition, the WCr steel exhibited the transgranular mode of mostly dimple type.

Mechanical Properties in Ultrahigh Strength Secondary Hardening Steels Bearing Co and Ni

2007 ◽  
Vol 539-543 ◽  
pp. 4417-4421 ◽  
Author(s):  
Ho Sup Sim ◽  
Ki Seop Cho ◽  
Kon Bae Lee ◽  
Hyung Ryul Yang ◽  
Hoon Kwon
Keyword(s):  
Mechanical Properties ◽  
Secondary Hardening ◽  
Peak Hardness ◽  
Direct Quenching ◽  
Ultrahigh Strength ◽  
Severe Deformation ◽  
Hardness Variation ◽  
Aging Kinetics ◽  
Ni Additions

Applying the severe deformation, the mechanical properties related to secondary hardening were investigated. The Mo-Cr-Co-Ni steels containing (5-13)wt% Co and (8-14)wt% Ni were severely rolled at 850 °C, followed by direct quenching(DQ). DQ specimens were then isothermally aged at 475°C. Ni additions promoted aging kinetics, accompanied by a little enhancement in hardness. In contrast, Co additions enhanced the peak hardness, but did not induce a remarkable aging acceleration. In the 13Co addition group, an actual secondary hardening, that is, the peak hardness is higher than the as-quenched hardness. Variation in peak hardness(Rc) in alloys is summarized as follows; 14Ni-13Co(57.2) ≒ 11Ni-13Co(57.1) > 8Ni-13Co(56.5) > 11Ni- 9Co(56.2) > 8Ni-9Co(54.4) > 11Ni-5Co(53.4).

Influences of Severe Deformation and Alloy Modification on Secondary Hardening and Fracture Behavior

2005 ◽  
pp. 183-186 ◽  
Author(s):  
Ho Sup Sim ◽  
K.S. Lee ◽  
Kon Bae Lee ◽  
Hyung Ryul Yang ◽  
Hoon Kwon
Keyword(s):  
Fracture Behavior ◽  
Secondary Hardening ◽  
Severe Deformation

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

High Temperature Oxidation Kinetics of Shot-Peened and Laser-Shock Peened Ti-Beta-21S

2021 ◽  
Author(s):  
V. Optasanu ◽  
M. C. Marco de Lucas ◽  
A. Kanjer ◽  
B. Vincent ◽  
T. Montesin ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxidation Kinetics ◽  
High Temperature Oxidation ◽  
Laser Shock ◽  
Temperature Oxidation ◽  
Kinetics Of
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