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Fatigue01:21

Fatigue

230
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
230

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Surface Condition Evolution and Fatigue Evaluation after Different Surface Processes for TiAl47Cr2Nb2 Alloy.

Wen Yu1,2, Yajun Yin1, Jianxin Zhou1

  • 1State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China.

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Surface treatments significantly impact TiAlCrNb alloy fatigue performance. Mechanical grinding yielded the smoothest surface, resulting in the highest fatigue limit of 350 MPa after thermal exposure.

Keywords:
TiAl alloyfatigue behaviorsinvestment castingsurface condition

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Titanium-aluminum-niobium alloys are crucial for high-temperature applications.
  • Surface integrity significantly influences the fatigue life of metallic components.
  • Understanding the effect of surface treatments on alloy performance under thermal stress is vital.

Purpose of the Study:

  • To investigate the effect of different surface treatments on the fatigue performance of TiAl47Cr2Nb2 alloy.
  • To analyze surface condition evolution and hardness changes after thermal exposure.
  • To determine the optimal surface treatment for enhanced fatigue resistance.

Main Methods:

  • Investment casting of TiAl47Cr2Nb2 alloy specimens.
  • Application of three surface processes: sand-blasting (SB), sand-blasting and shot-peening (SBSP), and sand-blasting and mechanical grinding (SBMG).
  • Thermal exposure at 700 °C for 24 hours, followed by surface roughness and hardness measurements, and fatigue testing.

Main Results:

  • Surface roughness (Ra) values were 3.14 µm (SB), 2.35 µm (SBSP), and 0.04 µm (SBMG), remaining stable after thermal exposure.
  • SB induced saturated work hardening; SBMG resulted in lower initial hardness due to removal of the hardened layer.
  • Hardness significantly recovered after thermal exposure for all treatments.
  • SBMG specimens exhibited the highest fatigue limit (350 MPa).

Conclusions:

  • The sand-blasting and mechanical grinding (SBMG) process yields the smoothest surface, crucial for high fatigue performance.
  • Despite lower initial hardness, the SBMG surface finish and residual work hardening contribute to superior fatigue resistance.
  • Surface treatment optimization is key to maximizing the fatigue life of TiAlCrNb alloys in demanding environments.