Crack growth behavior and failure micromechanisms in three heat resistant materials at elevated temperature

Hour, K. Y.; Stubbins, James F.

doi:10.1016/0956-7151(90)90115-w

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…They suggested that creep damage could be attributed to a considerable reduction of the fatigue life in the tests at lower cyclic frequencies and with hold times. In their study on fatiguecrack-growth behavior of HASTELLOY X at 650°C, Hour and Stubbins [5] observed that the alloy remained a transgranular crack-propagation mode at all frequencies. The purpose of this investigation is to present experimental results and theoretical analyses of the test-temperature and tensile strain hold-time effects on low-cycle fatigue behavior of HASTELLOY X at elevated temperatures in air.…”

Section: Introductionmentioning

confidence: 97%

Hold-Time Effects on Low-Cycle-Fatigue Behavior of Hastelloy X Superalloy at High Temperatures

Lu¹,

Chen²,

Wang³

et al. 2004

Superalloys 2004 (Tenth International Symposium)

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Total strain-controlled low-cycle-fatigue tests with and without hold times were performed at temperatures ranging from 816°C to 982°C in a laboratory air on a nickel-based superalloy, HASTELLOY X. The influence of hold times on the cyclicstress response and fatigue life was studied. At the temperatures considered, the alloy exhibited initial cyclic hardening, followed by a saturated cyclic-stress response or cyclic softening under low-cycle fatigue without hold times. For low-cycle-fatigue tests with hold times, however, the alloy showed cyclic hardening, cyclic stability, or cyclic softening, which is closely related to the test temperature and the duration of the hold time. It was also observed that the low-cycle-fatigue life of the alloy considerably decreased due to the introduction of strain hold times. Generally, a longer hold time would result in a greater reduction in the fatigue life. For the tests without hold times, the test temperature seems to have little influence on the fatigue life of the alloy at the test temperatures from 816ºC to 927ºC. However, when the test temperature increased to 982ºC, the fatigue life clearly shortened. In addition, the fracture surfaces of the fatigued specimens were observed, using scanningelectron microscopy, to determine the crack initiation and propagation modes. The fatigue life was predicted by the frequency-modified tensile-hysteresis-energy method. The predicted lives were found to be in good agreement with the experiment results.

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Section: Introductionmentioning

confidence: 97%