基于α''组织设计适于激光立体成形的新型高塑性Ti-4.13Al-9.36V合金

doi:10.11901/1005.3093.2020.536

材料研究学报

2021, Vol. 35

Issue (10): 741-751 DOI: 10.11901/1005.3093.2020.536

研究论文

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基于α''组织设计适于激光立体成形的新型高塑性Ti-4.13Al-9.36V合金

刘田雨¹, 朱智浩¹, 张爽², 董闯¹^,²(

), 闵小华³, 王清¹

^1.大连理工大学三束材料改性教育部重点实验室大连 116024
^2.大连交通大学材料科学与工程学院大连 116028
^3.大连理工大学材料科学与工程学院大连 116024

A Novel Ti-4.13Al-9.36V Alloy of High Ductility Designed on Base of α''-Microstructure for Laser Solid Forming

LIU Tianyu¹, ZHU Zhihao¹, ZHANG Shuang², DONG Chuang¹^,²(

), MIN Xiaohua³, WANG Qing¹

^1.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
^2.School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
^3.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

引用本文:

刘田雨, 朱智浩, 张爽, 董闯, 闵小华, 王清. 基于α''组织设计适于激光立体成形的新型高塑性Ti-4.13Al-9.36V合金[J]. 材料研究学报, 2021, 35(10): 741-751.
Tianyu LIU, Zhihao ZHU, Shuang ZHANG, Chuang DONG, Xiaohua MIN, Qing WANG. A Novel Ti-4.13Al-9.36V Alloy of High Ductility Designed on Base of α''-Microstructure for Laser Solid Forming[J]. Chinese Journal of Materials Research, 2021, 35(10): 741-751.

全文: PDF(15335 KB) HTML

摘要:

为了提高Ti-6Al-4V合金的加工硬化率和塑性，基于其团簇成分式12[Al-Ti₁₂](AlTi₂)+5[Al-Ti₁₄](V₂Ti)设计成分式为4[Al-Ti₁₂](AlTi₂)+12[Al-Ti₁₄](V₂Ti)的(Ti-4.13Al-9.36V, %)合金，采用激光立体成形工艺制备Ti-4.13Al-9.36V和Ti-6.05Al-3.94V(对比合金)，研究了沉积态和固溶温度对其显微组织和力学性能的影响。结果表明，沉积态Ti-4.13Al-9.36V和Ti-6.05Al-3.94V合金的显微组织均由基体外延生长的初生β柱状晶和晶内细小的网篮α板条组成。Ti-6.05Al-3.94V合金的初生β柱状晶的宽度约为770 μm，α板条的宽度约为0.71 μm；而Ti-4.13Al-9.36V合金的初生β柱状晶的宽度显著减小到606 μm，α板条的宽度约为0.48 μm。经920℃固溶-淬火处理后Ti-6.05Al-3.94V样品的显微组织为α'+α相，其室温拉伸屈服强度约为893 MPa，抗拉强度约为1071 MPa，延伸率约为3%。经750℃固溶-淬火处理后Ti-4.13Al-9.36V样品的显微组织为α''+α相，与α'马氏体相比，应力诱发的α''马氏体能显著地提高合金的加工硬化能力，其室温拉伸屈服强度约为383 MPa，抗拉强度约为 989 MPa，延伸率达到了17%。这表明，根据团簇理论模型调控α''+α的显微组织能有效提高激光立体成形Ti合金的加工硬化能力和塑性。

关键词 ：金属材料, 成分设计, 团簇加连接原子模型, 激光立体成形, 加工硬化

Abstract：

Ti-6Al-4V alloy is widely used in laser solid forming, however, low work-hardening ability and ductility limit its industrial applications. In this paper, a novel Ti-4.13Al-9.36V (%) alloy with cluster composition of 4[Al-Ti₁₂](AlTi₂)+12[Al-Ti₁₄](V₂Ti) was designed based on the cluster composition formula 12[Al-Ti₁₂](AlTi₂)+5[Al-Ti₁₄](V₂Ti) of Ti-6Al-4V. Samples of two alloys Ti-4.13Al-9.36V and Ti-6.05Al-3.94V (set as contrast alloy) were prepared by laser solid forming and followed by heat treatment. Then the microstructure and mechanical properties of the as-deposited and solution treated alloys were investigated. The results show that the microstructure of the as-deposited alloys Ti-4.13Al-9.36V and Ti-6.05Al-3.94V consists of columnar prior-β grains, which grow epitaxial from the substrate along the deposition direction. A basket-weave α-laths existed in the inner prior-β grains. The width of prior-β grains and the width of α-laths of Ti-4.13Al-9.36V alloy are ca 606 μm and 0.48 μm, in the contrast, those of Ti-6.05Al-3.94V alloy are ca 770 μm and 0.71 μm, respectively. Further, after the Ti-6.05Al-3.94V subjected to post solution treatment at 920°C for 2 h followed by water cooling, its microstructure consists of phases α'+α, and the corresponding yield strength, ultimate tensile strength and ductility to failure were ca 893 MPa, 1071 MPa and 3%, respectively. However, when the Ti-4.13Al-9.36V subjected to post solution treatment at 750°C for 2 h followed by water cooling, its microstructure consists of phases α''+α, and the related yield strength, ultimate tensile strength and ductility to failure were ca 383 MPa, 989 MPa and 17%, respectively. This may be ascribed to that the stress-induced α''-phase could significantly improve the work-hardening ability compared with α'-phase. The work-hardening ability and ductility of the Ti-alloy used for laser solid forming could be significantly improved by adjusting the microstructure with phases α''+αvia cluster-plus-glue atom model.

Key words： metallic materials composition design cluster-plus-glue atom model laser solid forming work-hardening

收稿日期: 2020-12-17

ZTFLH:

TG166.5

基金资助:国家重点研发计划(2016YFB1100103);大连市科技创新基金重点学科重大课题(2020JJ25CY004)

作者简介: 刘田雨，男，1993年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.536 或 https://www.cjmr.org/CN/Y2021/V35/I10/741

表1 Ti-Al-V合金的团簇成分式及其化学成分

图1 用纯Ti、纯Al和纯V粉末混合制备的Ti-6.05Al-3.94V合金的SEM照片和激光立体成形扫描方式

图2 Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金样品的测试位置

图3 激光立体成形Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金横截面的XRD谱

图4 沉积态Ti-6.05Al-9.36V和Ti-4.13Al-9.36V的OM和SEM照片

图5 Ti-6.05Al-9.36V和Ti-4.13Al-9.36V合金的SEM照片

表2 Ti-6.05Al-9.36V和Ti-4.13Al-9.36合金α板条宽度随固溶温度的变化

图6 固溶处理后Ti-6.05Al-9.36V和Ti-4.13Al-9.36V合金的TEM组织形貌和衍射谱

表3 沉积态和固溶态Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金的维氏硬度

图7 沉积态和固溶处理后Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金的室温拉伸工程应力-应变曲线

表4 沉积态和固溶态Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金的屈服强度(σYS)、抗拉强度(σUTS)和延伸率(δ)

图8 加工硬化率曲线

图9 沉积态Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金的SEM断口形貌

图10 固溶态Ti-6.05Al-3.94V和Ti-4.13Al-9.36V合金的SEM断口形貌

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