P/M Alloy 10: A 700�C Capable Nickel-Based Superalloy for Turbine Disk Applications

Abstract

The Versatile Affordable Advanced Turbine Engine (VAATE) program has been supporting the development of Alloy 10, a gasatomized powder metal (PM) superalloy. Funding for the program was provided by U.S. Air Force Research Laboratory (AFRL).Honeywell International, Rolls Royce -Allison Advanced Development Company (AADC), and Williams International have been jointly developing Alloy 10 for small and large gas turbine engine applications. Alloy 10 is a demonstrated industry leader in high temperature creep resistance, and has been produced using production-scale equipment for high pressure turbine disk applications. To address cost issues, the VAATE Alloy 10 project evaluated the relative differences between material densified by hot isostatic pressing (as-HIP) and material produced by extrusion followed by isothermal forging. The program was completed as a series of four tasks: (i) chemistry optimization, (ii) as-HIP compaction, (iii) HIP compaction plus isothermal forging for small engine applications, and (iv) extrusion plus isothermal forging for large engine applications. This report provides the status of the program, microstructures typical of the various Alloy 10 product forms, and a summary of initial mechanical properties data.

High‐Throughput Method–Accelerated Design of Ni‐Based Superalloys

“…where T creep (K) is the creep temperature, C = 20, and t creep (h) represents the creep life. It could be observed that under the same testing condition (e.g., 690 MPa, 1023 K), the C2 and C4 alloys exhibited longer lifetime than U720Li, [77] N18LSHR, [73] alloy 718, [78] and GH4169 [79] alloys, indicating that the former alloys have better creep resistance than the latter alloys and validating our creep resistance optimization by machine learningassisted alloy design. The above validation clearly indicated the accuracy and efficiency of our machine learning-assisted alloy design strategy.…”

“…Creep resistance of designed alloys and several typical polycrystalline superalloys: U720Li, [ 77 ] N18, [ 73 ] alloy 718, [ 78 ] and GH4169. [ 79 ] …”

Grain Boundary Serration in Nickel-Based Superalloy Inconel 600: Generation and Effects on Mechanical Behavior

“…Later studies on IN738, Astroloy, PM alloy-10, Waspaloy, and RR1000 have proven similar influences. [18][19][20][21][22][23] The study up to date on STAL-15 again revealed similar trend-with both extensive experiments and modeling efforts. [24][25][26] In addition, for alloys with low or no c 0 phase, creep life and ductility are significantly enhanced.…”

Site-Dependent Tension Properties of Inertia Friction-Welded Joints Made From Dissimilar Ni-based Superalloys

“…Having much finer c grains and c¢ precipitates, LSHR has almost twice the strength of Mar-M247 at temperatures below 700°C. However, the strength of LSHR rapidly decreases at higher temperatures and above $900-1000°C Mar-M247 becomes stronger than LSHR ( Ref 4,[14][15][16]. Considerable high temperature softening of LSHR, relative to Mar-M247, is caused by a lower c¢ solvus temperature of LSHR, T LS_S = 1157°C (Ref 17), than that of Mar-M247, T M_S = 1225°C (Ref 18) and, at low strain rates, by grain-boundary sliding in the fine-grained LSHR.…”