About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Alloy Phase Transformations at Elevated Temperatures
|
Presentation Title |
Single-step Aging Treatment on Cast Haynes 282 Ni-based Alloy – Microstructure and Mechanical Behavior |
Author(s) |
Timothy G. Lach, Xiang Chen |
On-Site Speaker (Planned) |
Timothy G. Lach |
Abstract Scope |
Haynes® 282® alloy is a Ni-based superalloy designed for excellent high-temperature strength and creep resistance. This improved performance is attributed to its chemical composition and microstructural features (e.g., γ' precipitates, soluble species, and metal carbides). To maximize high-temperature strength, Haynes-282 is typically subjected to a solution-annealing heat treatment followed by a two-step age-hardening treatment. However, this is a time-intensive and expensive process. A simplified single-step aging treatment was successfully completed for the wrought version of Haynes-282 and yielded microstructural features that produced strengthening behavior normally associated with more complex thermal processing. For cast Haynes-282, the behavior is made complicated by casting heterogeneities and defects. In this work, high-resolution analytical electron microscopy and high temperature mechanical behavior testing were used to evaluate the microstructural evolution of the single-step aging treatment on cast Haynes-282 alloy. Detailed comparisons will be made with the standard aging treatment and with aging of the wrought alloy. |