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Article
The Constant-Stress, Constant-Heating-Rate Test: A Novel Method for Characterizing Transient Mechanical Behavior of Metallic Materials
A novel mechanical test for characterizing the transient, on-heating mechanical behavior of metallic structural materials was developed. It comprises the continuous heating of a specimen at a constant rate whi...
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Article
The Application of Differential Scanning Calorimetry to Investigate Precipitation Behavior in Nickel-Base Superalloys Under Continuous Cooling and Heating Conditions
A suite of experimental tools and fast-acting, numerical-simulation techniques was used to quantify the precipitation behavior of three nickel-base superalloys: IN-100, LSHR, and 718. Experimental methods comp...
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Article
Effect of Cooling Rate on Microstructure Evolution and Plastic Flow of Ti-6Al-4V
The effect of cooling rate following subtransus solution treatment on microstructure evolution and plastic flow of Ti-6Al-4V was established. For this purpose, three types of tests were performed using samples...
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Article
In-Situ Determination of Precipitation Kinetics During Heat Treatment of Superalloy 718
Two in-situ test techniques were used to obtain insight into the isothermal precipitation kinetics of γ″ and γ′ in superalloy 718. The first method consisted of measurements of Young’s modulus using a dynamic-res...
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Article
A Fast-Acting Method for Simulating Precipitation During Heat Treatment of Superalloy 718
A fast-acting, mean-field method for simulating precipitation of the γ′′ and γ′ phases during aging of superalloy 718 following super-delta-solvus solution treatment was formulated and validated using observation...
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Article
Transient Plastic Flow and Phase Dissolution During Hot Compression of α/β Titanium Alloys
Transients in plastic flow behavior and the kinetics of dynamic dissolution of α particles were established via isothermal, hot compression testing of Ti-6Al-4V (Ti64) and Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti6242S). For ...
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Article
An Investigation of Tertiary γ′ Precipitation in a Powder-Metallurgy, γ-γ′ Nickel-Base Superalloy
The kinetics of precipitation of tertiary γ′ during continuous cooling of a powder-metallurgy, nickel-base superalloy were established via a series of laboratory-scale heat treatments and fast-acting numerical si...
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Article
High-Temperature Static Coarsening of Gamma-Prime Precipitates in NiAlCr-X Single Crystals
The high-temperature coarsening behavior of γ′ precipitates in a series of NiAlCr, NiAlCrTi, NiAlCrW, and NiAlCrTa single-crystal alloys was determined at temperatures between 1158 K and 1473 K (885 °C and 120...
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Article
Dissolution of the Alpha Phase in Ti-6Al-4V During Isothermal and Continuous Heat Treatment
The kinetics of the dissolution of the equiaxed alpha phase into the beta matrix in Ti-6Al-4V were established and modeled for both isothermal (constant temperature) and transient/continuous heating conditions...
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Article
The Effect of Cooling Rate on High-Temperature Precipitation in a Powder-Metallurgy, Gamma/Gamma-Prime Nickel-Base Superalloy
The effect of cooling rate in the range of 10 K/s to 250 K/s (10 °C/s to 250 °C/s) on the precipitation of secondary gamma prime following supersolvus solution treatment of the powder-metallurgy superalloy LSH...
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Article
Precipitation Modeling of Multi-Component Nickel-Based Alloys
Computer aided materials design is of increasingly importance and interest because the conventional approach solely relying on experimentation is no longer viable within the constraint of available resources....
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Article
An Investigation of High-Temperature Precipitation in Powder-Metallurgy, Gamma/Gamma-Prime Nickel-Base Superalloys
The high-temperature-precipitation behavior of a typical powder-metallurgy, gamma-gamma-prime, nickel-base superalloy (LSHR) was determined and used to develop and validate a quantitative fast-acting model. To...
