HAYNES® 244® alloy was chiefly developed to address the need for high-strength, low coefficient of thermal expansion (CTE) alloys for seal rings and cases in advanced gas turbine engines.&nbsp; In addition to these attributes, adequate resistance to low-cycle fatigue (LCF) due to cyclic thermal and mechanical loading during service is critical for such applications.&nbsp; The LCF performance of commercially produced 12.5 mm (0.5”) thick, fully heat treated plate products of 244 alloy was evaluated by means of axial strain-controlled (R = - 1) LCF tests covering total strain ranges up to 1 % (without dwells), at temperatures ranging from 427-760oC (800-1400oF).&nbsp; In addition, the comparative LCF performance of Waspaloy, a well-established alloy for turbine cases, was evaluated under selected, nominally identical test conditions.&nbsp; S-N curves were constructed and fitted by the Coffin-Manson equation, allowing the delineation of regimes controlled by the elastic and plastic response of the material.&nbsp; Fracture surfaces were examined in the scanning electron microscope to identify fatigue crack initiation sites and crack propagation modes.&nbsp; Differences between the alloys are discussed in terms of tensile strength and cyclic hardening/softening behavior.&nbsp; Implications for fatigue performance of these alloys under cyclic thermal loading are discussed as well.&nbsp;HAYNES and 244 are registered trademarks of Haynes International, Inc.&nbsp;

Comparative Low-Cycle Fatigue Behavior of Haynes 244 Alloy and Waspaloy

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

Turbo Expo 2021

Supporting the need among researchers worldwide for additional online and multimedia content, ASME now offers the ASME Conference Video Collection. This platform will collect and provide long-term access to conference presentation videos, encompassing all technology areas within ASME's technical conference and events program. About 30,000-40,000 engineers across all mechanical engineering and related disciplines participate in ASME conferences each year. This includes authors of approximately 6,000 to 8,000 technical papers published by ASME, the majority of whom also submit video presentations for our virtual conferences. The video collection will be available as an add-on to existing product packages or as a separate subscription.