scholarly journals Evolution of dispersoids and their effects on elevated-temperature strength and creep resistance in Al-Si-Cu 319 cast alloys with Mn and Mo additions

2020 ◽  
Vol 770 ◽  
pp. 138554 ◽  
Author(s):  
Lanfeng Jin ◽  
Kun Liu ◽  
X. Grant Chen
Keyword(s):  
Elevated Temperature ◽  
Creep Resistance ◽  
Elevated Temperature Strength ◽  
Cast Alloys ◽  
Mo Additions

scholarly journals Properties of Novel High Temperature Titanium Alloys for Aerospace Applications

2020 ◽  
Vol 321 ◽  
pp. 04006
Author(s):  
John Mantione ◽  
Matias Garcia-Avila ◽  
Matthew Arnold ◽  
David Bryan ◽  
John Foltz
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Creep Resistance ◽  
Engine Performance ◽  
Beta Titanium Alloy ◽  
Elevated Temperature Strength ◽  
Jet Engine ◽  
Beta Titanium ◽  
Alpha Beta ◽  
Beta Titanium Alloys

The attractive combination of strength and low density has resulted in titanium alloys covering 15 to 25% of the weight of a modern jet engine, with titanium currently being used in fan, compressor and nozzle components. Typically, titanium alloys used in jet engine applications are selected from the group of near alpha and alpha-beta titanium alloys, which exhibit superior elevated temperature strength, creep resistance and fatigue life compared to typical titanium alloys such as Ti-6Al-4V. Legacy titanium alloys for elevated temperature jet engine applications include Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al-2Sn-4Zr-2Mo-0.1Si and Ti-4Al-4Mo-2Sn-0.5Si. Improving the mechanical behavior of these alloys enables improved component performance, which is crucial to advancing jet engine performance. As a world leader in supplying advanced alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved elevated temperature properties. These improved properties derive from precipitation of secondary intermetallics in alpha-beta titanium alloys. ATI has developed several new alpha-beta titanium alloy compositions which exhibit significantly improved elevated temperature strength and creep resistance. This paper will focus on the effects of chemistry and heat treat conditions on the microstructure and resulting elevated temperature properties of these new aerospace titanium alloys.

scholarly journals Evolution of Elevated-Temperature Strength and Creep Resistance during Multi-Step Heat Treatments in Al-Mn-Mg Alloy

2018 ◽  
Author(s):  
G. S. Wang ◽  
K. Liu ◽  
S. L. Wang
Keyword(s):  
Heat Treatment ◽  
Elevated Temperature ◽  
Creep Resistance ◽  
Threshold Stress ◽  
Heat Treatments ◽  
Mg Alloy ◽  
Elevated Temperature Strength ◽  
Lower Temperature ◽  
Increasing Temperature ◽  
Step Heat Treatment

Present work has systematically investigated the evolution of dispersoid and elevated-temperature properties including the strength and creep resistance during the various multi-step heat treatments in Al-Mn-Mg 3004 alloys. Results show that only α-Al(MnFe)Si dispersoid is observed in the studied temperature range (up to 625°C) and it coarsens with increasing temperature to 500°C but dissolves at 625°C. The evolution of elevated-temperature strength and creep resistance is greatly related to the temperature of each step during the multi-step heat treatments. Generally, lower temperature at the first-step heat treatment leads to higher properties while the properties decrease with increasing temperature of last-step heat treatment. Suitable models have been introduced to explain the evolution of strength and the creep threshold stress at elevated-temperature during the various heat treatments.

DMV 310 N

Alloy Digest ◽  
2009 ◽  
Vol 58 (1) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Elevated Temperature ◽  
Austenitic Stainless Steel ◽  
Creep Resistance ◽  
Heat Treating ◽  
Elevated Temperature Strength ◽  
Temperature Performance ◽  
Special Modification

Abstract DMV 310 N is a special modification of 310, an austenitic stainless steel, by additions of both nitrogen and niobium. This addition results in increased elevated-temperature strength and creep resistance. The alloy has potential in advanced boilers with high steam temperatures. This datasheet provides information on composition, physical properties, and elasticity. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-1027. Producer or source: Mannesmann DMV Stainless USA Inc.

Study on Microstructure of Several Nb-Ti-Cr-Al as-Cast Alloys

2012 ◽  
Vol 581-582 ◽  
pp. 504-509
Author(s):  
Yan Qing Wang ◽  
Zhao Gang Liu ◽  
Ben Shuang Sun ◽  
Dong Xin Wang
Keyword(s):  
Elevated Temperature ◽  
Solidification Process ◽  
Al Alloy ◽  
Elevated Temperature Strength ◽  
Developed Country ◽  
Good Oxidation Resistance ◽  
Precipitated Phase ◽  
Arc Melting ◽  
Cast Alloys ◽  
Mechanical Performances

Due to low-density, higher elevated temperature strength and good oxidation resistance; the Nb-Ti-Cr-Al alloy was estimated to become a new kind of material used at elevated temperature of next generation. Therefore, it was widely studied by western developed country, but there are still many questions unsolved in this area. In this article, several kinds of Nb-Ti-Cr-Al alloys of different compositions were prepared by arc melting, and analyzed by metallographic method, XRD, SEM and EDS. The results indicated, in Nb-40Ti-15Al alloy, the solidified Structure was typical small equiaxed grains, columnar crystals and common equiaxed crystals. And in Nb-40Ti-10Cr alloy, there is a serious coring segregation of Cr element; it can induce intergranular fracture of ingot. As the content of Cr element increased, constitutional supercooling occurred in solidification process, and the microstruture changed from straight crystal boundary to dendrite, such as Nb-40Ti-20Cr alloy. As for Nb-40Ti-10Cr-10Al alloy, the addition of Al and Cr lead to a great number of sub boundary and precipitated phase, and the microsegregation in alloy are also reduced to a certain degree. To sum up, the content level of Cr and Al is essential to both the microstructure and mechanical performances of Nb-Ti based alloys.

scholarly journals Enhanced Elevated-Temperature Strength and Creep Resistance of Dispersion-Strengthened Al-Mg-Si-Mn AA6082 Alloys through Modified Processing Route

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5489
Author(s):  
Jovid Rakhmonov ◽  
Kun Liu ◽  
Paul Rometsch ◽  
Nick Parson ◽  
X.-Grant Chen
Keyword(s):  
Elevated Temperature ◽  
Yield Strength ◽  
Creep Resistance ◽  
Thermal Exposure ◽  
Processing Route ◽  
Base Case ◽  
Compressive Yield Strength ◽  
Strengthening Effect ◽  
Elevated Temperature Strength ◽  
New Processing

In the present work, we investigated the possibility of introducing fine and densely distributed α-Al(MnFe)Si dispersoids into the microstructure of extruded Al-Mg-Si-Mn AA6082 alloys containing 0.5 and 1 wt % Mn through tailoring the processing route as well as their effects on room- and elevated-temperature strength and creep resistance. The results show that the fine dispersoids formed during low-temperature homogenization experienced less coarsening when subsequently extruded at 350 °C than when subjected to a more typical high-temperature extrusion at 500 °C. After aging, a significant strengthening effect was produced by β″ precipitates in all conditions studied. Fine dispersoids offered complimentary strengthening, further enhancing the room-temperature compressive yield strength by up to 72–77 MPa (≈28%) relative to the alloy with coarse dispersoids. During thermal exposure at 300 °C for 100 h, β″ precipitates transformed into undesirable β-Mg2Si, while thermally stable dispersoids provided the predominant elevated-temperature strengthening effect. Compared to the base case with coarse dispersoids, fine and densely distributed dispersoids with the new processing route more than doubled the yield strength at 300 °C. In addition, finer dispersoids obtained by extrusion at 350 °C improved the yield strength at 300 °C by 17% compared to that at 500 °C. The creep resistance at 300 °C was greatly improved by an order of magnitude from the coarse dispersoid condition to one containing fine and densely distributed dispersoids, highlighting the high efficacy of the new processing route in enhancing the elevated-temperature properties of extruded Al-Mg-Si-Mn alloys.

Microstructural characterization of a rapidly solidified Al-Fe-V-Si alloy for elevated temperature applications

1988 ◽  
Vol 46 ◽  
pp. 550-551
Author(s):  
R. E. Franck ◽  
J. A. Hawk ◽  
G. J. Shiflet
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Grain Growth ◽  
Volume Fraction ◽  
Microstructural Characterization ◽  
Second Phase ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Temperature Applications

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

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