CAJ | 학술논문

采用轴向应变控制的方法，研究Ti-43Al-9V-0.3Y合金材料在550℃时不同应变量条件下的高温低周疲劳行为。通过Manson-Coffin公式分析循环应力?应变和应变疲劳寿命，推导拟合出应变幅与疲劳寿命之间的关系式。分析试样高温低周疲劳断口的形貌，得出β/γ三相钛铝基合金的高温低周疲劳的机理。结果表明：Ti-43Al-9V-0.3Y 合金的应变疲劳的过渡疲劳寿命循环周次约为49，合金的循环应力响应行为取决于外加总应变幅，合金疲劳行为具有循环软化特性，弹性变形是该合金低周疲劳的主要因素。
채용축향응변공제적방법，연구Ti-43Al-9V-0.3Y합금재료재550℃시불동응변량조건하적고온저주피로행위。통과Manson-Coffin공식분석순배응력?응변화응변피로수명，추도의합출응변폭여피로수명지간적관계식。분석시양고온저주피로단구적형모，득출β/γ삼상태려기합금적고온저주피로적궤리。결과표명：Ti-43Al-9V-0.3Y 합금적응변피로적과도피로수명순배주차약위49，합금적순배응력향응행위취결우외가총응변폭，합금피로행위구유순배연화특성，탄성변형시해합금저주피로적주요인소。
The high temperature low cycle fatigue behavior of Ti-43Al-9V-0.3Y alloy under condition of different strain amplitudes and 550℃was studied by the method of axial strain control. Based on the formula of Manson-Coffin, the cyclic stress strain and the strain fatigue life were analyzed, and the formula between amplitude and fatigue life was deduced and fitted. After analyzing the fracture morphologies of high temperature low cycle fatigue fracture of sample, the mechanism of high temperature low cycle fatigue ofβ/γthree-phase TiAl alloy was obtained. The results show that the transition fatigue life cycles of strain fatigue of Ti-43Al-9V-0.3Y is about 49. Cyclic stress response depends on the applied total strain amplitude, and the fatigue behavior has the cyclic softening characteristics.