Jixie qiangdu (Jan 2020)

THERMO-MECHANICAL FATIGUE( TMF) BEHAVIOR OF CASTING Ti-48Al-2Cr-2Nb INTER-METALLIC ALLOY

  • ZHONG Bin,
  • JIAO ZeHui,
  • ZHENG Fei,
  • MA Yue,
  • SU Bin

Journal volume & issue
Vol. 42
pp. 559 – 564

Abstract

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The thermo-mechanical fatigue( TMF) behavior of casting alloy Ti-48 Al-2 Cr-2 Nb was researched. The tests were performed thermo-mechanically in-phase( IP) at 400℃ ~ 800℃ . During TMF,tests strain was controlled. The result of this IP TMF was compared with 400℃ and 800℃ isothermal low cycle fatigue( LCF). The result shows that the fatigue life of Ti-48 Al-2 Cr-2 Nb alloy in 400℃ ~ 800℃ TMF condition is longer than 400℃ and 800℃ LCF within high strain region. Within low strain region,it is slightly shorter than 400℃ LCF and within the dispersion zone of 800℃ LCF. In this TMF condition,no evidence shows hardening or softening phenomenon. SEM analysis shows that inter-lamellar and inner-lamellar cracking and trans-lamellar tearing can be observed on the fracture surface.

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