轧制方式和变形量对纯钼板坯微观组织和织构的影响  

Microstructure and Texture of Pure Molybdenum Sheet at Different Rolling Methods and Deformation

作　　者：李继文[1] 杨松涛[2] 魏世忠 张国赏[1] 徐流杰 U 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]中色科技股份有限公司,河南洛阳471039 [3]高温难熔金属材料河南省工程实验室,河南洛阳471003

出　　处：《稀有金属》2014年第3期348-353,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(50972039)资助

摘　　要：采用X射线衍射仪(XRD),通过测量不同{hkl}晶面的衍射强度判断钼板表面法向的取向分布,研究了热轧纯钼板不同变形量和轧制方式下的微观组织和织构演变。结果表明:单向轧制,晶粒取向呈现出一定的方向性;随着变形量的增加,晶粒变形程度增加,大晶粒破碎,晶粒尺寸变小,晶粒取向愈加明显。交叉轧制,平行于轧制方向上的晶粒沿轧制方向被压缩伸长,呈层状分布,表现出面织构的特征性;垂直轧向的晶粒交错搭接,方向性减弱。单向轧制使{111}〈uvw〉织构得到强化,导致板材各向异性趋于明显。交叉轧制可削弱单向轧制过程中产生的{111}〈uvw〉织构,有利于降低钼板材的各向异性;同时,随着轧制变形量的增加,有利于{100}〈uvw〉织构的形成和强化,当变形量达90%以上时,{100}〈uvw〉织构最强。By means of the X-ray diffraction （XRD）, the {hkll lattice plane diffracted intensity was measured to judge the microstructure orientation distribution of the molybdenum plate surface. Moreover, the influence of the deformation and rolling method on the microstructure and texture evolution was investigated. The results showed that the grain orientation expressed the directionality as oneway rolled. With the increase of the deformation, the large grain was broken and refined, and the grain orientation and grain deformation were more obvious. For the cross roiled, the grain paralleled to the rolling direction was compressed and elongated to express lay ered distribution and texture feature. The grain perpendicular to rolling direction was overlapped, and the grain orientation was less obvious. {111 } 〈 uvw） texture could be strengthened and the anisotropy would be created in one-way rolled. The cross roiled would relax texture that produced in one way rolling. Meanwhile, with the increase of the roiling deformation, {100} （uvw） textures were formed and strengthened increasingly. {100 } 〈 uvw 〉 texture was the strongest when the deformation was above 90%.

关 键 词：纯钼板 轧制方式 变形量 显微组织 织构 

分 类 号：TG335.11[金属学及工艺—金属压力加工]