Heat-to-Heat Variations in Creep-Rupture Properties of Annealed 2 1/4 Cr-1 Mo Steel

1983 ◽  
Vol 105 (4) ◽  
pp. 320-328
Author(s):  
R. L. Klueh
Keyword(s):  
Rupture Life ◽  
High Stress ◽  
Stress Rupture ◽  
Carbide Precipitation ◽  
Creep Rupture ◽  
Creep And Stress Rupture ◽  
Stress Rupture Properties ◽  
Data Scatter ◽  
Life Tests ◽  
Rupture Properties

The creep and creep-rupture properties of 13 heats of annealed 2 1/4 Cr-1 Mo steel were determined at 510 and 566°C (950 and 1050°F). The microstructures of all heats were primarily polygonal ferrite (75–80 percent); the balance was mostly bainite with 1–2 percent pearlite and scattered carbides. At each temperature the results indicated considerable data scatter for the high-stress (short rupture life) tests. As the stress was lowered, the creep and stress-rupture properties converged, which resulted in a decrease in the data scatter. Much of the variation and change in the properties could be attributed to the carbide precipitation reactions that occur in the steel.

AISI No. 664

Alloy Digest ◽  
1981 ◽  
Vol 30 (7) ◽  
Keyword(s):  
High Temperature ◽  
Stress Rupture ◽  
Heat Treating ◽  
Good Combination ◽  
Creep And Stress Rupture ◽  
High Temperature Alloy ◽  
Vacuum Melting ◽  
Stress Rupture Properties ◽  
Nickel Base ◽  
Rupture Properties

Abstract AISI No. 664 is a nickel-base high-temperature alloy that can be precipitation hardened because of its contents of aluminum and titanium. Vacuum melting is used in its production to provide excellent quality and reproducability. It is used for applications requiring a good combination of creep and stress-rupture properties up to about 1500 F. Typical applications are gas-turbine components, airframes and fasteners. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-269. Producer or source: Nickel alloy producers.

scholarly journals Influence Mechanism of Silicon on Carbide Phase Precipitation of a Corrosion Resistance Nickel Based Superalloy

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 959 ◽  
Author(s):  
Tao Liu ◽  
Mei Yang ◽  
Fenfen Han ◽  
Jiasheng Dong
Keyword(s):  
Carbide Phase ◽  
Silicon Content ◽  
Rupture Life ◽  
Stress Rupture ◽  
Low Carbon ◽  
Stress Rupture Life ◽  
Corrosion Resistant ◽  
Stress Rupture Properties ◽  
Corrosion Resistant Alloy ◽  
Rupture Properties

The effect of silicon on diffusion behavior of the carbide forming elements in Ni-Mo-Cr-Fe based corrosion-resistant alloy is studied by diffusion couple experiment. One group of diffusion couples are made of the alloy with a different silicon content, another group of diffusion couples are made of pure nickel and the alloy with different silicon content (0Si, 2Si). Two groups of alloys with same silicon content and different carbon content are also prepared, the microstructure of solution and aging state of these two groups alloys are analyzed, and their stress rupture properties are tested. The effect of silicon on the diffusion of alloy elements and the interaction effect of carbon and silicon on the microstructure and stress rupture properties of the alloy are analyzed. The mechanism of Si on the precipitation behavior of carbide phase in Ni-Mo-Cr-Fe corrosion resistant alloy is discussed. The results show that silicon can promote the diffusion of carbide forming elements and the formation of carbide. The precipitation behavior of the secondary phase is the result of the interaction effect of silicon and carbon, and is related to the thermal history of the alloy. Combined with the characteristic of primary carbides, it is confirmed that the precipitation of M12C type secondary carbide is caused by the relative lack of carbon element and the relative enrichment of carbide forming elements such as molybdenum. The stress rupture properties of two silicon-containing alloys with different carbon contents in solution and aging state are tested. The stress rupture life of low carbon alloy is lower compared with high carbon alloy at solution state, but after aging treatment, the stress rupture life of low carbon alloy is significantly improved, and higher than that of high carbon alloy. The main aim of this research is to reveal the influence mechanism of silicon on carbide phase precipitation of a Ni-Mo-Cr-Fe based corrosion-resistant superalloy, which provides theoretical basis and reference for later alloy design and engineering application.

Influence of Ageing Treatments on Stress Rupture Properties of Ni3Al-Base Single-Crystal Alloy IC21 at 850°C

2013 ◽  
Vol 747-748 ◽  
pp. 659-664 ◽  
Author(s):  
Hui Li ◽  
Fu Lin Li ◽  
Shu Suo Li ◽  
Heng Zhang ◽  
Sheng Kai Gong
Keyword(s):  
Heat Treatment ◽  
Single Crystal ◽  
Rupture Life ◽  
Stress Rupture ◽  
Heat Treatments ◽  
Air Cooling ◽  
Single Crystal Alloy ◽  
Stress Rupture Properties ◽  
Microstructure Examination ◽  
Rupture Properties

The influence of three different ageing treatments (R1:1100/2h,air cooling+870/32h,air cooling, R2: 870/32h,air cooling and R3: 1060/2h,air cooling+870/32h,air cooling) on stress rupture properties of Ni3Al-base single-crystal alloy IC21 was investigated. The results indicate that ageing heat treatments have obvious effects on stress rupture properties of IC21 at 850/500Mpa. After R3 ageing treatment, IC21 alloy presents the longest rupture life and the smallest ellipticity and elongation compared to those after the other two ageing treatments. Microstructure examination shows that the mean size of γ precipitate is about 0.44μm after R3 ageing heat treatment (1060/2h, ac + 870/32h, ac). Transmission electron microscope (TEM) study on the rupture samples illustrates that after R1 and R2 ageing heat treatments, the density of stacking faults increases and the length is larger compared to that after R3 heat treatment. Meanwhile the shearings of γ precipitates are more severe. The appropriate γ phase size and γ channel width after R3 treatment promote homogenous deformation by <110>{111} slip in the matrix, and facilitate the formation of finer dislocation networks on the γ/γ interface, which can restrain the shearing of γ phase by dislocations.

Heat Treated Microstructure and Mechanical Properties of K492M Alloy

2014 ◽  
Vol 788 ◽  
pp. 493-497
Author(s):  
Xiang Hui Li ◽  
Lian Li ◽  
Xin Tang ◽  
Qi Dong Gai
Keyword(s):  
Mechanical Properties ◽  
Grain Boundary ◽  
Interdendritic Region ◽  
Rupture Life ◽  
Stress Rupture ◽  
Stress Rupture Life ◽  
Stress Rupture Properties ◽  
Heat Treated ◽  
Columnar Grain ◽  
Rupture Properties

The microstructure, tensile and stress rupture properties of K492Malloy have been investigated in the present study. The results revealed that γ matrix, γ′ phase, carbide and eutectic in the interdendritic region within grain interior and along grain boundary were observed after solidification. After heat treatment, γ' precipitates with two obviously distinct size existed in the dendrite core and interdendritic region, respectively. Meanwhile, the chain-like (W, Mo)6C and Cr23C6carbides precipitated along grain boundary. The investigation of mechanical properties suggested that the tensile strength was initially increased but then decreased with increasing the temperature from 25oC to 760oC. The stress rupture life was 68.2h and 35.8h at 760oC / 655MPa and 870oC / 365MP, respectively. The columnar grain and carbide along grain boundary resulted in intergranular brittle fracture in both test conditions. As a result, the elongation under the conditions of 760oC/655MPa and 870oC/365MP was 1.5% and 1.4%, respectively.

Microstructure and Mechanical Properties of In718 Alloy Produced with Twin-Scanning Atomizer

2007 ◽  
Vol 561-565 ◽  
pp. 415-418 ◽  
Author(s):  
Zheng Dong Li ◽  
Guo Qing Zhang ◽  
Zhou Li ◽  
Wen Yong Xu ◽  
Rui Ping Yao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Rupture Life ◽  
Stress Rupture ◽  
Spray Forming ◽  
Microstructure And Mechanical Properties ◽  
Stress Rupture Properties ◽  
Direct Aging ◽  
Rupture Properties

Sound billets were produced at BIAM with a twin-scanning spray forming facility. Microstructure and mechanical properties of In718 alloy produced with this technology were examined. Both tensile strength and stress rupture properties are excellent with the rupture life even doubled after received a direct aging heat treatment.

Effects of Ru Additions on the Microstructures and Stress Rupture Life of a Directionally Solidified Ni-Based Cast Superalloy

2007 ◽  
Vol 546-549 ◽  
pp. 1201-1206 ◽  
Author(s):  
Xiao Lei Han ◽  
Ya Fang Han ◽  
Shu Suo Li ◽  
Wen You Ma
Keyword(s):  
Rupture Life ◽  
Stress Rupture ◽  
Aging Treatment ◽  
Incipient Melting ◽  
Directionally Solidified ◽  
Stress Rupture Life ◽  
Stress Rupture Properties ◽  
Heat Treated ◽  
Rupture Properties ◽  
Cast Superalloy

Two directionally solidified (DS) Ni-based cast superalloys without and with 3wt. % Ru were prepared. The effects of Ru addition on the microstructures and stress rupture properties of the heat treated superalloys were investigated. It is shown that the amount of eutectic in 3wt. % Ru alloy was less than that in alloy without Ru. The incipient melting structure was found after quenching followed by 1295°C and 1300°C solid solution treatments in 3wt. % Ru alloy and in the alloy without Ru, respectively. The temperature at which the eutectic pools dissolved completely was higher than the temperature at which incipient melting appears. In order to obtain the better mechanical properties, double aging treatment was carried out for both alloys to optimize the sizes, morphologies and distribution of the γ′ phase. The stress rupture lives of the alloys were 55h and 108h under the condition of 1070°C and 137MPa the alloys without Ru and with 3wt. % Ru respectively. It is suggested that 3wt. % Ru addition can prolong the stress rupture life of the alloy.

scholarly journals Influence of solution treatment on microstructure and stress rupture properties of K439 nickel-base superalloy

2018 ◽  
pp. 78-82
Author(s):  
Jin Xu ◽  
Mingjun Zhang ◽  
Xin Tang ◽  
Guangyu Yang ◽  
Jingyang Chen ◽  
...  
Keyword(s):  
Cast Alloy ◽  
Rupture Life ◽  
Dendritic Structure ◽  
Solution Treatment ◽  
Stress Rupture ◽  
Solution Temperature ◽  
Nickel Base Superalloy ◽  
Air Cooling ◽  
Stress Rupture Properties ◽  
Rupture Properties

The isochronal solution treatment (4h) in the 1080-1190°C range with air cooling are performed to investigate the effects of solution temperature on the microstructure and stress rupture properties of K439 alloy. The detailed as-cast and solution treated microstructures were analyzed through optical microscopy (OM), scanning electron microscopy (SEM) and differential scanning calorimeter (DSC). The experimental results show that the as-cast alloy exhibited a typical dendritic structure with five phases of γ, γ´, γ/γ´, η and MC. After solution heat treated at 1080°C, although all of the γ´ particles in the dendritic cores were dissolved, there were still some of these precipitates in the interdendritic regions beside η phase. With the solution temperature increasing to 1150°C, all of the γ´ and η solutioned and a uniform microstructure was observed. Furthermore, increasing the temperature to 1210°C, a small amount of incipient melting occurred in the alloy. The stress rupture life of K439 alloy at 760°C/530MPa increased with the rising of solution temperature and reached to the top value under the solution temperature of 1150°C. The optimum solution treatment considered to be 1150 C/4 h followed by air cooling.

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