24444 Abstract
|Table of Contents|

Heterogeneous Microstructure Design and Property Optimization of Titanium Alloys Assisted by Phase Field Simulation(PDF)

MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]

Issue:
2022年第07期
Page:
497-507
Research Field:
Publishing date:

Info

Title:
Heterogeneous Microstructure Design and Property Optimization of Titanium Alloys Assisted by Phase Field Simulation
Author(s):
HAO Mengyuan12 Li Pei3 WANG Dong12
(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)
Keywords:
titanium alloy phase field simulation two-step aging continuous cooling heterogeneous microstructure
CLC:

PACS:
TG146.23
DOI:
10.7502/j.issn.1674-3962.202112021
DocumentCode:

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.

References

Memo

Memo:
Last Update: 2022-06-29