Journal Published Online: 22 April 2021
Volume 10, Issue 2

Creep-Fatigue Behavior of a Newly Developed Ultra-Supercritical Steam Turbine Grade Nickel-Based Superalloy, HAYNES 282

CODEN: MPCACD

Abstract

Most engineering components used in gas/steam turbines are exposed to a range of complex loading conditions resulting from startup and shutdown procedures. These loading conditions involve superimposition of time-dependent creep on cyclic fatigue and can be simulated by properly designed high-temperature creep-fatigue tests. Creep-fatigue interaction is a function of duration and position of dwell in the loading waveform, and the material microstructure. The objective of this work is to investigate the creep-fatigue interaction response of a newly developed γ′-strengthened wrought nickel-based superalloy (HAYNES 282), which has a potential application in advanced ultra-supercritical steam turbines. Creep-fatigue tests are conducted at 760°C with strain dwell either at tensile peak or compressive peak or at both tensile and compressive peak positions for different dwell times of 100 and 1,000 s. The test results are analyzed with respect to evolutions of peak stress, stress amplitude, stress relaxation, hysteresis loop, inelastic strain energy density, and degree of softening. Degree of softening is found to increase with dwell position at tensile, compressive, and both peaks in that order. Tests with dwell at both tensile and compressive peak positions are found to be the most damaging, showing the least life. Between tensile dwell and compressive dwell tests, interestingly, those with compressive dwell show a significantly reduced life. Increasing dwell time aggravates the damaging effect manifold. The mechanism of fracture at the end of life is illustrated with fractographic characterization.

Author Information

Mukherjee, Shreya
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
Barat, Kaustav
Material Science Division, Council of Scientific and Industrial Research – National Aerospace Laboratories, Bangalore, India
Tarafder, Soumitra
Material Science and Technology Division, Council of Scientific and Industrial Research – National Metallurgical Laboratory, Jamshedpur, India
Sivaprasad, S.
Material Science and Technology Division, Council of Scientific and Industrial Research – National Metallurgical Laboratory, Jamshedpur, India
Kar, Sujoy Kumar
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, India
Pages: 16
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: MPC20200167
ISSN: 2379-1365
DOI: 10.1520/MPC20200167