Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

Superalloys are widely used for many advanced applications. The alloys with optimum properties are obtained by introducing suitable microstructure through thermomechanical treatments. Characterization of microstructure and determination of mechanical properties of these alloys using ultrasonic parameters should help in quality control during heat treatment and identifying changes in microstructure during service. This study is aimed at demonstrating such a possibility in a selected precipitation hardenable nickel base superalloy, Nimonic alloy PE16. As part of this study, the influence of various secondary phases, γ′, MC and M23C6 on ultrasonic velocity is reported. Ultrasonic velocity has been selected as this parameter had been widely used for microstructural characterization and mechanical property determination in various materials [1–6]. γ′ is a coherent and ordered FCC phase having composition Ni3 (Al, Ti). The strengthening is achieved by the presence of γ′ in the microstructure. MC and M23C6 are respectively the Ti rich (Ti, Mo) C and Cr rich (Cr, Fe)23C6 carbides. The carbide phases are introduced to obtain better high temperature creep properties.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Properties

Pages

1663-1672

DOI

10.1007/978-1-4615-3742-7_72

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Influence of Microstructure on Ultrasonic Velocity in Nimonic Alloy PE16

La Jolla, CA

Superalloys are widely used for many advanced applications. The alloys with optimum properties are obtained by introducing suitable microstructure through thermomechanical treatments. Characterization of microstructure and determination of mechanical properties of these alloys using ultrasonic parameters should help in quality control during heat treatment and identifying changes in microstructure during service. This study is aimed at demonstrating such a possibility in a selected precipitation hardenable nickel base superalloy, Nimonic alloy PE16. As part of this study, the influence of various secondary phases, γ′, MC and M23C6 on ultrasonic velocity is reported. Ultrasonic velocity has been selected as this parameter had been widely used for microstructural characterization and mechanical property determination in various materials [1–6]. γ′ is a coherent and ordered FCC phase having composition Ni3 (Al, Ti). The strengthening is achieved by the presence of γ′ in the microstructure. MC and M23C6 are respectively the Ti rich (Ti, Mo) C and Cr rich (Cr, Fe)23C6 carbides. The carbide phases are introduced to obtain better high temperature creep properties.