一种近α钛合金管在热轧过程中位向对组织球化的影响  

Effect of crystallographic orientation on globularization during the rolling of a nearαtitanium alloy tube

作　　者：祝文沙 潘明艳 Zhu Wensha;Pan Mingyan(Department of Materials Engineering,Shanxi Institute of Mechanical&Electrical Engineering,Changzhi 046011,Shanxi,China;Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]山西机电职业技术学院材料工程系,山西长治046011 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《钢铁钒钛》2021年第5期69-73,98,共6页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(编号11535010)资助;山西机电职业技术学院科技创新类院级课题(编号KT-20002)。

摘　　要：研究了一种近α钛合金管在热轧过程中发生的动态球化规律。通过金相组织分析和电子背散射衍射(EBSD)技术对管材外表面附近和中间部位进行观察,结果发现:在热轧过程中,管材外表面附近的α相球化率很高,球化后的组织大角度晶界变多而小角度晶界变少;中间部位的α相球化程度受晶体学位向影响很大。通过计算不同晶体学取向α相的施密特因子,发现基面滑移和柱面滑移在轧向(RD)和弦向(TD)均有较大的施密特因子(>0.3)时,很容易发生球化。当α相仅有一种滑移系且仅在一个方向有较大的施密特因子时,则很难被球化。The dynamic globularization of a nearαtitanium alloy tube during hot rolling was studied by observation of different regions of the pipe using metallographic analysis and electron backscatter diffraction(EBSD)technology.The results showed that the fraction of globularizedαphases near the outer surface of the tube was very high.After globularization,the large-angle grain boundaries increased and the small-angle grain boundaries decreased.The globularization of theαphases in the middle part was greatly affected by the crystal orientation.The Schmidt factor ofαphase in different crystallographic orientations is calculated.It was found that theαphases were more prone to be globularized when the basal slips and prism slips have a larger Schmidt factor(>0.3)in the rolling direction(RD)and transverse direction(TD),respectively.The globularization would be difficult when theαphase has only one slip system and the Schmidt factor was high only in one direction.

关 键 词：钛合金 管材 热轧 组织 球化 晶体学位向 

分 类 号：TF823[冶金工程—有色金属冶金] TG337.6[金属学及工艺—金属压力加工]