【摘要】：通過光學顯微鏡、掃描電子顯微鏡、拉伸力學性能和沖擊性能測試等手段,對比研究了Nb對汽車車身熱軋板的顯微組織和力學性能影響,探討了Nb元素的作用機理。結(jié)果表明,在汽車車身板中添加一定含量的Nb元素可以顯著細化晶粒,細化珠光體片層間距,并使珠光體片層更加平直;添加一定Nb元素后,熱軋板的屈服強度和抗拉強度分別提高了37%和54%,斷后伸長率和斷面收縮率也有所提升,拉伸斷口中韌窩更加細小、均勻,且深度更深;沖擊性能提高了52.6%,這主要與細晶強化和第二相強化有關。
[Abstract]:By means of optical microscope, scanning electron microscope, tensile mechanical properties and impact test, the effect of Nb on microstructure and mechanical properties of hot rolled sheet of automobile body was studied, and the action mechanism of Nb element was discussed. The results show that adding a certain amount of Nb element to the automobile body plate can significantly refine the grain size, refine the lamellar spacing of pearlite, and make the pearlite lamellar layer more straight. The yield strength and tensile strength of hot rolled plate were increased by 37% and 54% respectively after adding certain Nb element. The elongation and shrinkage of fracture section were also increased. The dimple in tensile fracture was smaller, more uniform and deeper. The impact property is increased by 52.6, which is mainly related to fine grain strengthening and second phase strengthening.
【作者單位】： 吉林科技職業(yè)技術學院汽車分院;長春汽車工業(yè)高等�？茖W校汽車工程系;
【分類號】：TG335.11
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本文編號：2322929