<strong>3D</strong>相场模拟研究<strong>Ti-6Al-4V</strong>合金片层组织形貌的影响因素

doi:10.11900/0412.1961.2023.00392

金属学报

2024, Vol. 60

Issue (9): 1265-1278 DOI: 10.11900/0412.1961.2023.00392

研究论文

本期目录 | 过刊浏览

3D相场模拟研究Ti-6Al-4V合金片层组织形貌的影响因素

张瑶¹, 齐敏², 孙佳³, 吴婷¹, 马英杰², 王皞¹(

), 杨锐²

^1.上海理工大学材料与化学学院增材制造研究院上海 200093
^2.中国科学院金属研究所沈阳 110016
^3.云南锡业新材料有限公司昆明 650106

3D Phase Field Simulation of Factors Influencing the Microstructure Morphology of Lamellar Ti-6Al-4V Alloy

ZHANG Yao¹, QI Min², SUN Jia³, WU Ting¹, MA Yingjie², WANG Hao¹(

), YANG Rui²

^1.Interdisciplinary Center for Additive Manufacturing, School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.Yunnan Tin New Material Company Limited, Kunming 650106, China

引用本文:

张瑶, 齐敏, 孙佳, 吴婷, 马英杰, 王皞, 杨锐. 3D相场模拟研究Ti-6Al-4V合金片层组织形貌的影响因素[J]. 金属学报, 2024, 60(9): 1265-1278.
Yao ZHANG, Min QI, Jia SUN, Ting WU, Yingjie MA, Hao WANG, Rui YANG. 3D Phase Field Simulation of Factors Influencing the Microstructure Morphology of Lamellar Ti-6Al-4V Alloy[J]. Acta Metall Sin, 2024, 60(9): 1265-1278.

全文: PDF(6635 KB) HTML

摘要:

Ti-6Al-4V是典型双相钛合金，不同的微观组织决定其力学性能，但由于缺少晶界α、片层α、α侧枝等相对取向关系的三维信息，难以实现组织的精准调控。本工作基于Pandat和Thermo-Calc热力学数据以及DICTRA动力学数据，采用相场法模拟Ti-6Al-4V合金片层α组织的三维形貌。研究了在820℃热处理温度下，界面能各向异性对片层α生长的影响并分析了不同时刻的溶质场。结果表明，片层α组织的演化形貌受界面能各向异性的影响，界面能各向异性由0.4:0.1:1.0增长到0.8:0.1:1.0时，片层α由粗大棒状转为细长针状。界面能各向异性越大，片层生长的速率越快。不同界面能各向异性条件下片层α组织的主要差别在于片层的疏密程度和生长速度，而生长方向基本无异，单片层的宽度逐渐变宽。相场模拟结果与实验结果吻合较好，片层组织的三维模拟结果展示出比扫描电镜二维照片更丰富的片层侧枝细节。在3D模拟中可观测到晶粒不同位置处侧枝的形貌。结果表明，侧枝与主片层之间的夹角既有实验观测到的30°，还存在任意角度。

关键词 ： Ti-6Al-4V, 相场, 片层α组织, 界面能, 溶质场

Abstract：

Ti-6Al-4V, a typical dual-phase titanium alloy, has mechanical properties largely determined by its microstructures. However, the absence of three-dimensional (3D) information regarding the relative orientation relationships of grain boundary α, α lamellae, and α side branches, hinders precise microstructure control. In this study, using thermodynamic data from Pandat and Thermo-Calc, along with kinetic data from DICTRA, the 3D morphology of α lamellae in Ti-6Al-4V alloy was simulated via the phase field method. This study simulated the influence of interfacial energy anisotropy on the growth of α lamellae at a heat treatment temperature of 820°C and analyzed the corresponding solute field. The findings reveal that interface energy anisotropy considerably affects the morphology of α lamellae. When the anisotropy of the interface energy increased from 0.4:0.1:1.0 to 0.8:0.1:1.0, the α lamellae transformed from a thick rod shape to a slender needle shape. Higher anisotropy levels lead to accelerated growth rates of α lamellae. Variation in interface anisotropy, primarily affect the density and growth rate of α lamellae, while their growth direction remains consistent. Additionally, the width of individual lamellae progressively widens under different interface anisotropies. The phase-field simulation results align closely with experimental findings. Notably, the 3D simulation results of α lamellae organization offer more detailed insights into the side branches of α lamellae than two-dimensional (2D) SEM images. In 3D simulation, it can be observed the growth morphology of side branches at different positions of grains. The results indicate that the angle between the main lamellae and the side branches includes experimental observations of 30° and random angles.

Key words： Ti-6Al-4V phase-field α lamellae interfacial energy solute field

收稿日期: 2023-09-19

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(U2241245,91960202);航空科学基金项目(2022Z053092001);冲击环境材料技术重点实验室基金项目(6142902220301);冲击波物理与爆轰物理重点实验室基金项目(2022JCJQLB05702)

通讯作者: 王皞，haowang7@usst.edu.cn，主要从事材料基因工程/增材制造方面的研究

Corresponding author: WANG Hao, professor, Tel: (021)55270108, E-mail: haowang7@usst.edu.cn

作者简介: 张瑶，女，1998年生，硕士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00392 或 https://www.ams.org.cn/CN/Y2024/V60/I9/1265

图1 不同热处理温度下3种界面能各向异性比在相同时间下的片层形貌

图2 热处理温度820℃下不同时刻(t)片层的生长演化形貌

图3 不同时刻相同z-x切面上(y = 252.85Δx)片层α侧枝形貌演化，及Ti-4211合金的微观组织[10]

图4 晶粒不同z-x切面处侧枝在t = 2000 s的形貌(单元长度Δx = 5 × 10-8 m)

图5 t = 500 s时晶粒不同位置处α片层的生长形貌

图6 820℃下α相体积分数随时间的演化规律

图7 820℃下不同界面能各向异性条件下α生长形貌

图8 不同界面能各向异性条件下在t = 1000 s时z-y切面的片层生长形貌

图9 t = 1000 s时，kx 分别为0.4、0.6和0.8条件下晶粒不同x-z切面上片层的生长形貌

图10 820℃生长100 s时不同界面能各向异性条件下Al的溶质分布

图11 不同界面能各向异性条件下V的溶质分布

图12 t = 50 s时片层组织的生长

图13 t = 100 s时片层组织的生长情况

图14 t = 100 s时不同界面能各向异性下的片层形貌

图15 kx:ky:kz = 0.6:0.1:1.0条件下t = 2000 s时晶粒不同位置处的z-y切面形貌

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