热处理调控 <strong><i>α + β</i></strong> 两相钛合金板材的力学及导电性能

doi:10.11900/0412.1961.2022.00490

金属学报

2024, Vol. 60

Issue (12): 1622-1636 DOI: 10.11900/0412.1961.2022.00490

研究论文

本期目录 | 过刊浏览

热处理调控 α + β 两相钛合金板材的力学及导电性能

张术钱¹^,², 马英杰²(

), 王倩², 齐敏¹^,², 黄森森², 雷家峰², 杨锐²

1 中国科学技术大学材料科学与工程学院沈阳 110016
2 中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Mechanical Properties and Electrical Conductivity of α + β Titanium Alloy Sheet Regulated by Heat Treatment

ZHANG Shuqian¹^,², MA Yingjie²(

), WANG Qian², QI Min¹^,², HUANG Sensen², LEI Jiafeng², YANG Rui²

1 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张术钱, 马英杰, 王倩, 齐敏, 黄森森, 雷家峰, 杨锐. 热处理调控 α + β 两相钛合金板材的力学及导电性能[J]. 金属学报, 2024, 60(12): 1622-1636.
Shuqian ZHANG, Yingjie MA, Qian WANG, Min QI, Sensen HUANG, Jiafeng LEI, Rui YANG. Mechanical Properties and Electrical Conductivity of α + β Titanium Alloy Sheet Regulated by Heat Treatment[J]. Acta Metall Sin, 2024, 60(12): 1622-1636.

全文: PDF(5059 KB) HTML

摘要:

热处理可有效调节两相钛合金的强塑性关系，但是热处理对其导电性能的影响还不明确。本工作研究了退火温度对Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材显微组织、力学性能及导电性能的影响。结果表明，轧制钛合金板材形成了沿轧向(RD)排列的条带状组织，板材织构类型为T型织构。板材在两相区退火后，双态组织中的α_s/β (α_s为次生α相)界面强化导致板材屈服强度升高，延伸率下降。屈服强度呈现明显各向异性，沿板材横向(TD)的屈服强度更高。而在单相区退火后，α_s相明显粗化，且有晶界α相(α_GB)相析出，板材延伸率急剧下降。α_s相变体选择诱发形成了R型织构和c轴方向沿ND向RD偏转20°~30°的新织构，此时沿板材TD的屈服强度仍高于沿RD的屈服强度，屈服强度各向异性受织构的影响减弱。电阻率分析结果表明，钛合金板材由于条带状组织及T型织构的形成，使沿板材RD的电阻率更高。而条带状组织消失及R型织构体积分数增加，使电阻率各向异性减弱。

关键词 ： α + β钛合金板材, 退火处理, 显微组织, 各向异性, 拉伸性能, 电阻率

Abstract：

Eddy current loss, which produces Joule heat and reduces transmission efficiency, is inevitable when the magnetic coupling is running. Magnetic couplings with high electrical resistivity alloys, such as titanium alloy, have been proven to be effective in suppressing the eddy currents. The Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr alloy sheet was a α + β titanium alloy for marine engineering with high specific strength and electrical resistivity, which was used in magnetic couplings to suppress the eddy currents. In this study, the effect of annealing temperature on the microstructure, mechanical properties, and electrical conductivity of the Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr alloy sheet was investigated. The results revealed that the band structure was arranged along the rolling direction (RD), and the as-rolled titanium alloy sheet showed a typical T-type texture with the c-axis of the α phase approximately parallel to the transverse direction (TD). A considerable increase in tensile strength and decrease in elongation after α ＋ β region (850-920^oC) annealing was thought to result from the strengthening of secondary α/β interfaces in the bimodal structure. Simultaneously, the α phase showed both T-type and R-type textures, which also resulted in higher yield strength along the TD of the sheet. Additionally, when the sheet suffered a β phase region annealing (950-1000^oC), the elongation immediately decreased due to the coarseness and precipitation of the secondary α and grain boundary α phases, respectively. Meanwhile, the annealed sheet showed an R-type and a new B-type texture components with basal poles rotated 20°-30° away from the normal direction (ND) toward the RD under the influence of variant selection of secondary α phase. However, the yield strength along the TD was still higher than that in the RD, indicating that the effect of texture on yield strength anisotropy was reduced. Finally, the electrical resistivity analysis of the titanium alloy sheet indicated that the electrical resistivity along the RD of the sheet was higher when the band structure was formed and the c-axis of the α phase was concentrated in the TD. However, the disappearance of the band structure and the increase in the volume fraction of the R-type texture will reduce the anisotropy of electrical resistivity.

Key words： α + β titanium alloy sheet annealing treatment microstructure anisotropy tensile property electrical resistivity

收稿日期: 2022-10-07

ZTFLH:

TG146

基金资助:国家重点研发计划项目(2021YFC2801801);国家自然科学基金项目(51871225)

通讯作者: 马英杰，yjma@imr.ac.cn，主要从事钛合金强韧化机制的研究

Corresponding author: MA Yingjie, professor, Tel: 13840026329, E-mail: yjma@imr.ac.cn

作者简介: 张术钱，男，1998年生，硕士

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图1 Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr板材试样及取样示意图

图2 Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材显微组织的SEM像

图3 Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材轧向-法向(RD-ND)面α相的取向成像图以及α相和β相的极图

图4 不同温度退火空冷后Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材显微组织的SEM像

图5 初生α相(αp相)和β转变组织(βt相)的体积分数以及αp相和次生α相(αs相)尺寸随退火温度的变化

图6 利用XRD测得的不同温度退火处理后α相的极图

图7 利用EBSD测得的不同温度退火后α相的极图

图8 920℃退火处理后Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材组织的EBSD分析

图9 1000℃退火态Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材的织构分析

图10 不同温度退火后Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材的室温拉伸性能

图11 沿Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材轧向(RD)和横向(TD) α相不同滑移系的Schmidt因子分布

图12 Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材经不同温度退火后α相RD和TD的反极图以及基面和柱面滑移的等Schmidt因子分布图

图13 Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材RD和TD的电阻率以及α织构组分体积分数随退火温度的变化

图14 织构类型对Ti-6Al-3Mo-2V-1Cr-2Sn-2Zr合金板材不同方向电子散射的影响

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