發(fā)布時間：2018-06-07 22:18

  本文選題：低能量多碰 + 塑性變形　； 參考：《哈爾濱工業(yè)大學學報》2017年05期

【摘要】：為研究碰撞能對金屬材料多碰塑性變形的影響,在實驗室用自制的凸輪機械式多碰試驗機對YT01試樣進行了低能量多碰試驗,采用坐標網(wǎng)格法、SEM、金相顯微鏡等方法研究了不同碰撞能對試樣的塑性變形率、顯微組織結(jié)構(gòu)的影響.實驗結(jié)果表明:峰值沖擊應(yīng)力不變時,多沖碰撞能量越大,試樣累積塑性變形量也越大;隨著碰撞次數(shù)的增加,試樣塑性變形率減小并趨于平緩,塑性變形終止于距沖擊表面69 mm處;256 000次碰撞后,試樣顯微組織細化,晶粒界增多.金屬材料多沖碰撞塑性變形不僅與峰值沖擊碰撞應(yīng)力有關(guān),也與沖擊碰撞能有關(guān).
[Abstract]:In order to study the effect of impact energy on the plastic deformation of metal materials, the low energy multi-impact test of YT01 sample was carried out in the laboratory with a self-made Cam mechanical multi-impact tester. The effects of different impact energies on the plastic deformation rate and microstructure of the specimens were studied by means of coordinate grid method (SEM) and metallographic microscope. The experimental results show that the larger the impact energy is, the larger the cumulative plastic deformation of the specimen is, and with the increase of impact times, the plastic deformation rate of the specimen decreases and tends to be gentle. The microstructure of the specimen was refined and the grain boundary increased after the plastic deformation was terminated at a distance of 69mm from the impact surface for 256,000 collisions. The plastic deformation of metal materials due to multiple impact is not only related to the peak impact stress but also to the impact energy.
【作者單位】： 蘇州大學材料與化學化工學部;蘇州大學機電工程學院;
【基金】：國家自然科學基金項目(11172191) 江蘇省高等職業(yè)院校國內(nèi)高級訪問學者計劃資助項目(2015)
【分類號】：TG115.5
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本文編號：1993001