【摘要】：基于高分辨率三維X射線斷層掃描技術(shù),對(duì)實(shí)際ADC12鋁合金壓鑄件疲勞試樣內(nèi)部微觀孔洞進(jìn)行了檢測(cè)和重構(gòu),對(duì)7組不同孔隙率的試樣進(jìn)行了5級(jí)應(yīng)力水平的高周疲勞實(shí)驗(yàn)。三參數(shù)Weibull分析表明:隨著應(yīng)力水平升高,疲勞壽命分散性逐漸降低。采用SEM觀察疲勞斷口,確定誘發(fā)疲勞裂紋起源的孔洞,并對(duì)其進(jìn)行了分析;基于斷口表面的孔洞特征以及X射線斷層掃描重構(gòu)數(shù)據(jù),建立了孔洞-疲勞壽命預(yù)測(cè)方程,并與實(shí)驗(yàn)結(jié)果進(jìn)行了對(duì)比分析。將三維X射線斷層掃描重構(gòu)數(shù)據(jù)與有限元分析相結(jié)合,計(jì)算和分析了實(shí)際微觀孔洞引起的應(yīng)力情況,為研究材料內(nèi)部實(shí)際微觀孔洞特征對(duì)性能的影響提供新的途徑。
[Abstract]:Based on the high resolution 3D X-ray scanning technique, the internal microvoids of ADC12 aluminum alloy die castings were examined and reconstructed. Seven groups of specimens with different porosity were tested with high cycle fatigue at five stress levels. Three-parameter Weibull analysis shows that the dispersion of fatigue life decreases with the increase of stress level. SEM was used to observe the fatigue fracture surface to determine the origination of the fatigue crack and to analyze it. Based on the pore characteristics of the fracture surface and the data of X-ray tomography reconstruction, the void-fatigue life prediction equation is established and compared with the experimental results. By combining the reconstruction data of 3D X-ray tomography with the finite element analysis, the stress caused by the actual micro-voids is calculated and analyzed, which provides a new way to study the effect of the characteristics of the microvoids inside the materials on the properties.
【作者單位】： 華南理工大學(xué)國(guó)家金屬材料近凈成形工程技術(shù)研究中心;
【基金】：國(guó)家高技術(shù)研究發(fā)展計(jì)劃資助項(xiàng)目(2013AA031201) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃項(xiàng)目(NCET-08-0209) 中央高校基本科研業(yè)務(wù)費(fèi)項(xiàng)目(2012ZP0006)
【分類號(hào)】：TG146.21;TG115

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本文編號(hào)：2394193