[1]郝梦园,李沛,王栋.相场模拟辅助钛合金多尺度微观组织设计及性能优化[J].中国材料进展,2022,41(07):497-507.[doi:10.7502/j.issn.1674-3962.202112021]
　HAO Mengyuan,Li Pei,WANG Dong.Heterogeneous Microstructure Design and Property Optimization of Titanium Alloys Assisted by Phase Field Simulation[J].MATERIALS CHINA,2022,41(07):497-507.[doi:10.7502/j.issn.1674-3962.202112021]
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相场模拟辅助钛合金多尺度微观组织设计及性能优化()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
41
期数:
2022年第07期
页码:
497-507
栏目:
出版日期:
2022-07-30

文章信息/Info

Title:
Heterogeneous Microstructure Design and Property Optimization of Titanium Alloys Assisted by Phase Field Simulation
文章编号:
1674-3962(2022)07-0497-11
作者:
郝梦园1; 2; 李沛3; 王栋1; 2
(1. 西安交通大学前沿科学技术研究院，陕西 西安 710049) (2. 西安交通大学 金属材料强度国家重点实验室，陕西 西安 710049) (3. 西安热工研究院有限公司 清洁低碳热力发电系统集成及运维国家工程研究中心，陕西 西安 710032)
Author(s):
HAO Mengyuan1; 2;  Li Pei3;  WANG Dong1; 2
(1. Frontier Institute of Science and Technology, Xi’an Jiaotong University, Xi’an 710049, China) (2. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China) (3. Thermal Power Research Institute Co. Ltd., National Engineering Research Center of Integration and Maintenance of Clean and Low-Carbon Thermal Power Generation System, NERC of TPGS, Xi’an 710032, China)
关键词:
钛合金; 相场模拟; 双步时效; 连续冷却; 多尺度微观组织
Keywords:
titanium alloy;  phase field simulation;  two-step aging;  continuous cooling;  heterogeneous microstructure
分类号:
TG146.23
DOI:
10.7502/j.issn.1674-3962.202112021
文献标志码:
A
摘要:
在科学研究和工程应用中，同时提高结构材料的强度和塑性仍然面临着巨大的挑战。根据相场模拟微观组织指导模型材料设计的思路，提出了通过激活不同的形核机制设计合金多尺度微观组织的新方法，进而克服结构材料强度和塑性不匹配效应。以双相钛合金为例，将真实热力学数据库与相场模型相耦合，探索了不同热处理工艺对合金微观组织的影响规律，提出了选择合适温度和时间的双步时效和调控冷速的热处理方案。基于模拟结果，实验时在Ti1023合金中分别提出了650 ℃/10 min+550 ℃/180 min双步时效工艺、0.3125 ℃/min连续冷却的热处理工艺，并产生了多尺度析出组织。进一步的力学性能测试表明，相较于传统的均匀组织，新获得的多尺度微观组织具有更好的强度与塑性匹配性能。所提出的基于相变理论的热处理工艺通过调控多尺度析出组织来优化性能的思路，为其它结构材料的性能提高提供了方向。
Abstract:
Improving the strength and ductility of structural materials simultaneously is still facing great challenges in scientific research and engineering applications. With the idea of guiding the design of model materials by phase field simulating microstructure, this paper proposes new methods for designing heterogeneous microstructure by activating different nucleation mechanisms to overcome the trade-off strength and ductility in structural material. Taking dual-phase titanium alloy as an example, this paper explores the influence of different heat treatment processes on the microstructure of the alloy by coupling the real thermodynamic database and the phase field model, and proposes a two-step aging that selects an appropriate aging temperature and time and a heat treatment scheme that regulates the cooling rate. Based on the simulation results, in the experiment, two-step aging (650 ℃/10 min+550 ℃/180 min) and continuous cooling (0.3125 ℃/min) were proposed in the Ti1023 alloy, and multi-scale heterogeneous microstructures were produced in the β titanium alloy. Further mechanical properties tests showed that the newly obtained heterogeneous microstructures have better strength-ductility matching properties compared to the conventional homogeneous microstructure. The idea of optimizing the properties by modulating the multiscale precipitation microstructure through the heat treatment process based on the phase transition theory proposed in our work provides a direction for the performance improvement of other structural materials.

备注/Memo

备注/Memo:
收稿日期：2021-12-27 修回日期：2022-03-22 基金项目：国家自然科学基金资助项目（52171012）第一作者：郝梦园，女，1995年生，博士研究生， Email:myhaoxjtu@163.com 通讯作者：王栋，男，1983年生，教授，博士生导师， Email:wang_dong1223@mail.xjtu.edu.cn
更新日期/Last Update: 2022-06-29