加載波形對(duì)Ti-60合金疲勞損傷行為的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時(shí)間：2016-01-17
研究了高應(yīng)力水平下加載波形對(duì)Ti-60高溫鈦合金疲勞損傷行為的影響。結(jié)果發(fā)現(xiàn)：對(duì)于在峰值應(yīng)力處保載2 min的加載波形，試樣的疲勞壽命明顯低于無保載的加載波形的試樣的壽命；在保載疲勞條件下，單位循環(huán)周次內(nèi)材料的疲勞變形明顯增大。
加載波形對(duì)Ti-60合金疲勞損傷行為的影響Effect of loading waveform on fatigue damage behavior of Ti-60 alloy研究了高應(yīng)力水平下加載波形對(duì)Ti-60高溫鈦合金疲勞損傷行為的影響。結(jié)果發(fā)現(xiàn)：對(duì)于在峰值應(yīng)力處保載2 min的加載波形，試樣的疲勞壽命明顯低于無保載的加載波形的試樣的壽命；在保載疲勞條件下，單位循環(huán)周次內(nèi)材料的疲勞變形明顯增大。SEM觀察表明，在保載波形下，疲勞源出現(xiàn)在樣品內(nèi)部，而無保載的加載波形下疲勞裂紋源于樣品次表面。TEM觀察表明，在兩種疲勞加載條件下，都有( 011)滑移系啟動(dòng)。
The effect of loading waveform on fatigue damage behavior of Ti-60 alloys at high stress level was studied. The results show that, under the loading waveform with 2 min dwell at the peak stress, the fatigue life is shorter than that without dwell. The fatigue strain in a unit cycle under the dwell fatigue condition is obviously larger than that under the no-dwell fatigue condition. It is observed by SEM that, under the dwell fatigue condition, the fatigue crack originates from the interior of specimens, while under the no-dwell fatigue condition, the fatigue crack originates from the subsurface of specimens. TEM observation indicates that, under the two loading waveforms, ( 011) slip system is activated.
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