A United Interpretation of Room-Temperature Strength of Notched Specimens as Influenced by their Size

1959 ◽  
Author(s):  
B. M. Wundt
Keyword(s):  
Room Temperature ◽  
Notched Specimens ◽  
Room Temperature Strength

Research on Effect of Alloy Elements on Equilibrium and Properties of Ni-Cr-Co Type Nickel-Based Superalloy

2016 ◽  
Vol 849 ◽  
pp. 513-519
Author(s):  
Qing Quan Zhang ◽  
Ming Yang Li ◽  
Ran Wei ◽  
Hui Yun Wu ◽  
Zhen Rui Li
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
High Temperature Strength ◽  
Nickel Based Superalloy ◽  
Type 3 ◽  
Room Temperature Strength ◽  
Super Alloy ◽  
Type Nickel

Ni-Cr-Co type Nickel-based super alloy Inconel 740H was studied. The effect of Nb, Al and Ti on the equilibrium of this alloy was analyzed by JMatPro software. The amount of Ti and Nb should be controlled by 1.50wt.%, and meanwhile, Al should be 1.0-2.0wt.%. If Mo and W were added the amount of Mo should be in the range of 1.0-2.0wt. %, and W should be about 1.0wt.%. Based on these results, three types of new alloys were designed, which contain Ni-Cr-Co-Mo type (1#), Ni-Cr-Co-W type (2#) and Ni-Cr-Co-Mo-W type (3#). Compared with the Ni-Cr-Co type Inconel 740H alloy, the room temperature strength, high temperature strength and high temperature durable performance of the three new alloys improved, which can provide the evidence and reference to optimize the chemical composition of Inconel 740H alloy, i.e., adding 1.50wt.% Mo and 1.0wt.% W individually or together.

Effect of Rolling Parameters on the Properties of Al-Fe-V Sheet Rolled on an Experimental Mill

1985 ◽  
Vol 58 ◽  
Author(s):  
A. Brown ◽  
D. Raybould
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Aluminum Alloys ◽  
Room Temperature ◽  
Thermomechanical Processing ◽  
High Temperature Strength ◽  
Rapidly Solidified ◽  
Large Sheet ◽  
Room Temperature Strength

ABSTRACTIn recent years, interest in high temperature aluminum alloys has increased. However, nearly all the data available is for simple extrusions. This paper looks at the properties of sheet made from a rapidly solidified Al-10Fe-2.5V-2Si alloy. The sheet is made by direct forging followed by hot rolling, this is readily scalable, so allowing the production of large sheet. The room temperature strength and fracture toughness of the sheet are comparable to those of 2014-T6. The high temperature strength, specific stiffness and corrosion resistance are excellent. Recently, improved thermomechanical processing and new alloys have allowed higher strengths and fracture toughness values to be obtained.

Superplastic Bulging of Nanocrystalline Ni-Co Alloy with Different Heating Methods

2012 ◽  
Vol 735 ◽  
pp. 136-139
Author(s):  
Guo Feng Wang ◽  
Shao Song Jiang ◽  
Zhen Lu ◽  
Kai Feng Zhang
Keyword(s):  
Nanocrystalline Materials ◽  
Fracture Behavior ◽  
Room Temperature ◽  
Hot Spot ◽  
Tensile Tests ◽  
Complex Stress ◽  
Resistance Heating ◽  
Furnace Temperature ◽  
Temperature Heating ◽  
Room Temperature Strength

Superplasticity of nanocrystalline materials is a hot spot in the field of scientific research. In this paper, Ni-Co alloy was produced through pulse electrodeposition. Tensile tests were carried out to study the room temperature strength, high temperature plasticity. The superplastic formability under complex stress was evaluated through the superplastic bulging tests. The tests were studied through the methods of resistance heating and furnace temperature heating. The maximum ratios of height and diameter with different heating method were compared. Fracture behavior and microstructure were observed by the method of SEM.

Room temperature strength of β-sialon (z=0.5) fabricated using fine grain size alumina powder

2001 ◽  
Vol 21 (9) ◽  
pp. 1269-1272 ◽  
Author(s):  
Kazushi Kishi ◽  
Seiki Umebayashi ◽  
Eiji Tani ◽  
Kazuhisa Shobu ◽  
Yanping Zhou
Keyword(s):  
Grain Size ◽  
Room Temperature ◽  
Alumina Powder ◽  
Fine Grain ◽  
Room Temperature Strength

Microwave Sintering of Si3N4 Ceramics

1992 ◽  
Vol 269 ◽  
Author(s):  
Jinsong Zhang ◽  
Lihua Cao ◽  
Fei Xia
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Microwave Sintering ◽  
Pressureless Sintering ◽  
Transformation Rate ◽  
Sintering Time ◽  
Si3n4 Ceramics ◽  
Room Temperature Strength ◽  
Better Than

ABSTRACTThe Si3N4 ceramics(91wt%Si3N4+5wt%Y2O3+4wt%Al2O3) of room temperature strength 620--760 MPa and fracture toughness 7 MPa-m½ were prepared by microwave sintering and their microstructure and mechanical properties were studied.The experiment results show that the higher N2 pressure (>4atm) is very necessary for microwave sintering of Si3N4 ceramics; microwave sintering can greatly decrease the sintering temperature to 1500* C, and increase the transformation rate of α to β-Si3N4,and reduce the total sintering time to about 1 hour. The mechanical properties of the Si3N4 ceramics sintered by microwave are better than that by conventional pressureless sintering.

The influence of substructure on the elevated and room temperature strength of a 26 Cr-1 Mo ferritic stainless steel

1982 ◽  
Vol 13 (3) ◽  
pp. 447-456 ◽  
Author(s):  
Charles G. Schmidt ◽  
Conrad M. Young ◽  
Bruno Walser ◽  
Rodney H. Klundt ◽  
Oleg D. Sherby
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Room Temperature ◽  
Room Temperature Strength

Room Temperature Strength and Fracture of FeAl And NiAl.

1990 ◽  
Vol 213 ◽  
Author(s):  
P. Nagpal ◽  
I. Baker ◽  
F. Liu ◽  
P.R. Munroe
Keyword(s):  
Grain Size ◽  
Room Temperature ◽  
Stoichiometric Composition ◽  
Aluminum Concentration ◽  
Fracture Modes ◽  
Tension Tests ◽  
Lattice Resistance ◽  
Stoichiometric Alloy ◽  
Room Temperature Strength

ABSTRACTThe yield strengths (σy) of FeA1 and NiAl of various aluminum concentrations were measured as a function of grain size, d, and the results fitted to σy =σo+ kd−1/2. It was found that for NiAl the lattice resistance (σo) and Hall-Petch slope (k) have minima at the stoichiometric composition and increase with decreasing aluminum concentration, whereas for FeAl these parameters have maxima at the stoichiometric composition and decrease off this composition. In tension tests, iron-rich FeAl was shown to be ductile whereas the stoichiometric alloy is brittle. In contrast, stoichiometric NiAl shows ductility but off-stoichiometric compositions are brittle. The fracture modes of the FeAl and NiAl are predominantly intergranular at the stoichiometric compositions and become increasingly transgranular with decreasing aluminum concentration.

Fabrication and Properties of Pressureless Sintered Si3N4/BN Composite Ceramics with La2O3-Al2O3-Y2O3 as Sintering Additives

2009 ◽  
Vol 620-622 ◽  
pp. 761-764
Author(s):  
Yong Feng Li ◽  
Ping Liu ◽  
Guan Jun Qiao ◽  
Jian Feng Yang ◽  
Hai Yun Jin ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Room Temperature ◽  
Weight Ratio ◽  
Pressureless Sintering ◽  
Sintering Process ◽  
Composite Ceramics ◽  
Sintering Additives ◽  
Xrd Patterns ◽  
Room Temperature Strength

With commercial α-Si3N4 and h-BN powders as starting materials, La2O3, Al2O3, Y2O3 as sintering additives, Si3N4/BN composite ceramics with 25vol% h-BN were fabricated by pressureless sintering. Various amounts of La2O3 (0, 2, 4, 8, 15wt%) were added, with constant Y2O3/Al2O3 weight ratio and additives (Y2O3/Al2O3/La2O3) amount. The densification behaviors, α-βtransformation and room-temperature strength of Si3N4/BN composite were investigated. The porosity of samples decreased with La2O3 content increasing, and the lowest porosity of 20.83% was observed for samples containing 4wt% La2O3, then leaded to an increase. The flexural strength of all the specimens increased with the addition up to 4wt% and changed greatly thereafter. The highest room-temperature flexural strength, 272.4MPa, was obtained when 4wt% La2O3 was added. Results of XRD patterns revealed that β-Si3N4 and h-BN existed in all the specimens. No α-Si3N4 was detected, implying thatα- toβ-Si3N4 transformation has been completed during the pressureless sintering process. These results show that the La2O3-Al2O3-Y2O3 system can act as effective sintering additives for pressureless sintered Si3N4/BN composite.

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