汽车车身热轧板的合金化与性能研究

发布时间：2018-11-10 16:14

【摘要】：通过光学显微镜、扫描电子显微镜、拉伸力学性能和冲击性能测试等手段,对比研究了Nb对汽车车身热轧板的显微组织和力学性能影响,探讨了Nb元素的作用机理。结果表明,在汽车车身板中添加一定含量的Nb元素可以显著细化晶粒,细化珠光体片层间距,并使珠光体片层更加平直;添加一定Nb元素后,热轧板的屈服强度和抗拉强度分别提高了37%和54%,断后伸长率和断面收缩率也有所提升,拉伸断口中韧窝更加细小、均匀,且深度更深;冲击性能提高了52.6%,这主要与细晶强化和第二相强化有关。
[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.
【作者单位】： 吉林科技职业技术学院汽车分院;长春汽车工业高等专科学校汽车工程系;
【分类号】：TG335.11
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本文编号：2322929