Crystallographic Differences of Metastable NI2MO in a NI-MO-AL Superalloy

1980 ◽  
Vol 38 ◽  
pp. 158-159
Author(s):  
Michael M. Kersker ◽  
E. A. Aigeltinger ◽  
J. J. IIren
Keyword(s):  
Mechanical Properties ◽  
Air Cooling ◽  
Solution Treated ◽  
Heat Treated ◽  
Metastable Compounds ◽  
Rapidly Solidified

Ni-rich alloys based on approximate ternary composition Ni-8Mo-15A1 (at%) are presently under investigation in an attempt to study the contribution, if any, of the profusion of Mo-rich NixMo metastable compounds that these alloys contain to their excellent mechanical properties. One of the alloys containing metastable NixMo precipitates is RSR 197 of composition Ni-8.96Mo-15.06A1-1.98Ta-.015Yt. The alloy was prepared at Pratt and Whitney Government Products Division, West Palm Beach, Florida, from rapidly solidified powder. The powder was canned under inert conditions and extruded as rod at 1315°C. The as-extruded rod, after air cooling, was solution treated at 1315°C for two hours, air cooled, and heat treated for one hour at 815°C, followed again by air cooling.

The Microstructure and Compression Behavior of Multi-Step Forging Ti-45Al-8Nb Alloy after Annealing at 1100 °C

2013 ◽  
Vol 747-748 ◽  
pp. 111-114
Author(s):  
Lin Song ◽  
Xiang Jun Xu ◽  
Jun Pin Lin ◽  
Lai Qi Zhang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Annealing Treatment ◽  
Air Cooling ◽  
Test Machine ◽  
Compressive Properties ◽  
Compression Behavior ◽  
Microstructure Change ◽  
Heat Treated ◽  
Before And After

Effects of annealing treatment on microstructure and the compressive properties of hot-worked Ti-45Al-8Nb-(W, B, Y) alloy were investigated. Microstructure of the extrusion plus multi-step forging pancake before and after heat treatment was analyzed by SEM and TEM, respectively. The annealing was conducted by holding samples at 1100°C for 2hrs, and followed by air cooling and furnace cooling. The mechanical properties were measured by Instron test machine. The microstructure evolution during compressive deformation was analyzed by TEM. The results showed that after the annealing the microstructure change could not be observed under SEM but can be observed under TEM. Many dislocation clusters were removed by heat treatment. The heat treated samples had similar compression behaviors with the pancake. TEM investigation showed that the numerous twin intersections occured in γ matrix during compression. The twin spaces tended to decrease as the deformation and the intersection increasing.

Microstructural Evolution and Mechanical Properties of Modified 9%Cr-1%Mo Steel upon Isothermal Heat-Treatment

2005 ◽  
Vol 475-479 ◽  
pp. 81-84
Author(s):  
Sung Kang Hur ◽  
Kee Sam Shin ◽  
Jung Hoon Yoo ◽  
Ja Min Koo ◽  
Soo Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Property ◽  
Microstructural Evolution ◽  
Heat Treating ◽  
Air Cooling ◽  
Isothermal Heat Treatment ◽  
Martensitic Structure ◽  
Heat Treated ◽  
Evolution Of Microstructure

The evolution of microstructure and its effects on the mechanical properties of modified 9%Cr-1%Mo steel during heat-treating at 1050°C for 15 min and then isothermal heat treatment at 380~760°C with subsequent air-cooling have been investigated. For the microstructural and mechanical property analyses, OM, SEM, EDS, XRD, hardness and impact tests were used. In accordance with the severity of the heat-treatment, the microstructure evolved from the untransformed martensite to the partially transformed dual phases of martensite and ferrite, and then fully transformed to ferrite. Impact values at ambient temperature for specimens isothermally heat-treated at 320 - 380°C, predominantly at about 350°C were lower than others’ with similar martensitic structure. The partially transformed specimens with dual phases of martensite and ferrite also showed lower impact values than samples with untransformed with martensitic, and transformed with ferritic structures.

scholarly journals Closed Die Hammer Forging of Inconel 718

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
S. Chenna Krishna ◽  
Satish Kumar Singh ◽  
S. V. S. Narayana Murty ◽  
Ganji Venkata Narayana ◽  
Abhay K. Jha ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Inconel 718 ◽  
Air Cooling ◽  
Aged Condition ◽  
Controlled Cooling ◽  
Solution Treated ◽  
Hemispherical Dome ◽  
Hammer Forging ◽  
Better Than

A method for the production of Inconel 718 (IN-718) hemispherical domes by closed die hammer forging is proposed. Different combination of operations employed for production are as follows: (i) preforging + final forging + air cooling, (ii) preforging + final forging + controlled cooling, (iii) direct forging + controlled cooling, and (iv) direct forging + air cooling. Last three combinations yielded a crack free hemispherical dome. The forged hemispherical domes were solution annealed at 980°C for 1 h and air cooled. The grain size of the domes at all locations was finer than ASTM No 4. Mechanical properties of the forged dome in solution treated and aged condition (STA) were better than feedstock used.

Effect of heat treatment on microstructures and mechanical properties of a Ti-6Al-4V alloy rod prepared by powder compact extrusion

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540004 ◽  
Author(s):  
Fei Yang ◽  
Brian Gabbitas
Keyword(s):  
Mechanical Properties ◽  
Powder Mixture ◽  
Powder Compact ◽  
Size Range ◽  
Heat Treatments ◽  
Holding Time ◽  
Water Quenching ◽  
Air Cooling ◽  
Homogeneous Microstructure ◽  
Heat Treated

In this paper, Ti-6Al-4V alloy rods were manufactured by the powder compact extrusion of a powder mixture of hydride–dehydride (HDH) titanium powder, elemental aluminum powder and master alloy powder. Extrusions were carried out at 1300°C and with a holding time of 5 min in an argon atmosphere. The effects of different heat treatments (HT1: 960°C/1 h, water quenching, HT2: 960°C/1 h, water quenching + 500°C/6 h, air cooling, HT3: 850°C/2 h, furnace cooling to 540°C, then air cooling) on the microstructure and mechanical properties of as-extruded Ti-6Al-4V alloy rods were investigated. The results showed that a homogeneous microstructure, composed of a lamellar structure with a grain size range of 40–60 μm, was produced by powder compact extrusion of a powder mixture. The mechanical properties achieved were an ultimate tensile strength (UTS) of 1254 MPa, a yield strength (YS) of 1216 MPa and 8% ductility. After quenching at 960°C and with a holding time of 1 h, the UTS and YS of the heat treated Ti-6Al-4V alloy rod were increased to 1324 MPa and 1290 MPa, and the ductility was increased to 12%. After HT2, the UTS and YS of the heat treated Ti-6Al-4V alloy rod were significantly increased to 1436 MPa and 1400 MPa, but the ductility decreased to 4%. After HT3, the mechanical properties of the heat treated Ti-6Al-4V alloy rod were slightly decreased to give a UTS of 1213 MPa and a YS of 1180 MPa, with an increase in ductility to 11%. The microstructural changes of as-extruded Ti-6Al-4V alloy rods were also investigated for the different heat treatments.

scholarly journals Microstructure, Texture, Electrical and Mechanical Properties of AA-6063 Processed by Multi Directional Forging

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2419 ◽  
Author(s):  
Alireza Dashti ◽  
Mohammad Shaeri ◽  
Reza Taghiabadi ◽  
Faramarz Djavanroodi ◽  
Farzaneh Vali Ghazvini ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Ambient Temperature ◽  
Solution Treated ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Treated Sample ◽  
Average Grain Size ◽  
Shear Yield

In current research, the effect of the multi-directional forging (MDF) process on the microstructure, texture, mechanical and electrical properties of AA-6063 under different heat treatment conditions at various MDF temperatures was studied. The annealed AA-6063 alloy was processed up to three passes of MDF at ambient temperature. Three passes of this process were also applied to the solution-treated AA-6063 at ambient temperature and 177 °C. Microstructural investigations demonstrated that the MDF process led to a significant reduction in the average grain size as well as a considerable increase in the fraction of low angle grain boundaries. Texture analysis revealed that copper and Goss textures were mainly developed within the annealed and solution-treated samples of AA-6063, respectively. The hardness and shear strength values of all processed samples also showed a sizeable improvement compared to the initial heat-treated samples. For example, the hardness and shear yield strength value of the solution-treated sample MDFed for three passes showed more than 100 and 70% increase, respectively. The effect of the MDF process on the electrical conductivity of AA-6063 under different heat treatment conditions at various temperatures was negligible. So, it can be concluded that the MDF process increased the mechanical properties without an appreciable decrease in electrical conductivity.

Effect of Mg, Sr, Ti and Aging Parameters on the Mechanical Behavior of 319 Alloys in the T5 and T6 Heat Treatment

2012 ◽  
Vol 482-484 ◽  
pp. 2275-2288
Author(s):  
Saleh Alkahtani
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Aging Treatment ◽  
Magnesium Content ◽  
Air Cooling ◽  
Particle Spacing ◽  
Sr Modification ◽  
Heat Treated ◽  
Negative Effect ◽  
Mg Content

In this work, the effect of metallurgical parameters (i.e. alloy chemistry and aging parameters) on the mechanical properties of 319 alloys was investigated, with the aim of adjusting these parameters to produce castings of suitable mechanical properties. An attempt has been made to quantify the effects of alloying elements (Mg, Sr, and Ti) and aging parameters on the mechanical properties of heat-treated (T5 and T6) 319 alloys. Exploring the heat treatment differences between T5 and T6 for 319 alloys would help in selecting the metallurgical conditions required to achieve the optimum and maximum mechanical properties. Aging treatments were carried out for 319 alloys in the T5- and T6-condition at 150°C, 180°C, 200°C, 220°C and 250°C for 4, 8, 16, 24 and 48 h, followed by air cooling. Aging treatment at a lower temperature of 150°C produces fine and dense precipitates having a smaller inter-particle spacing, while at higher aging temperatures, such as 250°C, the precipitates are coarser in size, less dense, and more widely dispersed. For 319 alloys, crack initiate and propagate mainly through the debonding of Si particles from the Al matrix and through the cleavage of β-iron intermetallics. Fracture of intermetallic phases in the interdendritic regions is mostly brittle, with the formation of microcracks at the Si, Cu, Fe-base intermetallics and aluminium interfaces. Experimental correlations of the results obtained from the mechanical properties measurements are analyzed and correlations that relate the alloying additions and heat treatment to the ultimate tensile strength (UTS), yield strength (YS) and total percent elongation (%E) of such alloys are found. Different levels of magnesium content (%Mg), Sr-modification (Sr-ppm), aging parameters (temperature and time) were tested. The effect of alloy additions (Mg, Sr and Ti) and aging heat treatment parameters (Temperature and Time) on the mechanical properties and alloy performance of cast and heat treated 319 alloys are investigated. It was found that the strength of 319 alloys increases with the magnesium content and decreases with the Sr-modification (Sr-ppm) and aging parameters (temperature and time). Increasing the Mg content in primary 319 alloys up to 0.45% enhances the alloy response to heat treatment in the T5 and T6 Tempers, more particularly, the T6 one. Sr-Modification of high Mg content 319 alloy in amounts of ~360 ppm leads to a noticeable decline in alloy strength due to porosity formation which counteracts the beneficial effect of the modification. Sr-modification has a negative effect on the % elongation results of Mg-content 319 alloys due to the Mg-Sr interaction in the aged-T6 conditions. However, grain refining of the Mg and Sr content 319 alloys produce sounder castings with finer grain sizes

Preparation and Heat Treatment of Ni60-WC/Cr12MoV Bimetallic Composite Materials

2013 ◽  
Vol 749 ◽  
pp. 366-371
Author(s):  
You Qing Cao ◽  
Yu Ting Lv ◽  
Peng Jang ◽  
Jin Fu Xu
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Transition Zone ◽  
Air Cooling ◽  
Micro Hardness ◽  
Binding Strength ◽  
Bimetallic Composite ◽  
Heat Treated ◽  
One Step ◽  
Morphology And Mechanical Properties

In present work, bimetallic composite materials (BCMs) were prepared by one-step sintering in box-furnace followed by quenching in salt furnace. The morphology and mechanical properties of the fabricated BCMs were characterized systematically. The results showed that Ni60-WC/Cr12MoV BCMs with a typical transition zone of ~480 μm could be successfully prepared by sintering at 1120 °C for 15min followed by furnace cooling to 400 °C and air cooling to ambient temperature. The resultant samples were heat treated by preheating at 860 °C, heating at 1020 °C, quenching at 520 °C, and tempering for two times at 200 °C for 2h. The average micro-hardness of the BCMs was measured to be of 869.34, 755.44~413.68, and 758.02 HV, which corresponded to the parts of Ni60-WC, transition zone and Cr12MoV, respectively. The interface binding strength of the BCMs was 234.22 MPa.

An analysis of the transport properties and mechanical stability of rapidly solidified Al-Sb alloy

2015 ◽  
Vol 10 (2) ◽  
pp. 2663-2681
Author(s):  
Rizk El- Sayed ◽  
Mustafa Kamal ◽  
Abu-Bakr El-Bediwi ◽  
Qutaiba Rasheed Solaiman
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Melt Spinning ◽  
Elastic Moduli ◽  
Mechanical Stability ◽  
Microstructural Analysis ◽  
Alloy System ◽  
Antimony Content ◽  
The Stability ◽  
Rapidly Solidified

The structure of a series of AlSb alloys prepared by melt spinning have been studied in the as melt–spun ribbons  as a function of antimony content .The stability  of these structures has  been  related to that of the transport and mechanical properties of the alloy ribbons. Microstructural analysis was performed and it was found that only Al and AlSb phases formed for different composition.  The electrical, thermal and the stability of the mechanical properties are related indirectly through the influence of the antimony content. The results are interpreted in terms of the phase change occurring to alloy system. Electrical resistivity, thermal conductivity, elastic moduli and the values of microhardness are found to be more sensitive than the internal friction to the phase changes. 

BERYLCO NICKEL ALLOY 440

Alloy Digest ◽  
1975 ◽  
Vol 24 (9) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Nickel Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Electronic Components ◽  
High Temperature Mechanical Properties ◽  
Temperature Performance ◽  
Solution Treated ◽  
Complex Shapes

Abstract BERYLCO NICKEL ALLOY 440 is an age-hardenable nickel-beryllium-titanium alloy that offers high strength, excellent spring properties outstanding formability, good high-temperature mechanical properties, and resistance to corrosion and fatigue. Complex shapes can be produced in the solution-treated (soft) condition and then aged to a minimum tensile strength of 215,500 psi. It is used for mechanical and electrical/electronic components in the temperature range -320 to 800 F. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-94. Producer or source: Kawecki Berylco Industries Inc.. Originally published September 1964, revised September 1975.

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