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通过利用ANSYS有限元分析软件对TC21钛合金锻件淬火过程进行数值模拟,获得TC21钛合金锻件淬火不同时刻温度场分布及热应力场分布,以及锻件上所选节点温度、热应力随淬火时间的变化关系,并观察从锻件心部至边部的组织变化,研究冷却速率对组织变化的影响规律。结果表明,当淬火3600s时,锻件表面已冷却至室温,而心部仍然保持较高温度;从锻件心部至表面冷却速度逐渐增加,并且越靠近表面,组织越细小。淬火开始阶段,锻件各点热应力迅速升至最大值,随着淬火时间延长,锻件表面及心部热应力均逐渐减小,至淬火结束时,锻件最大残余应力仅为77MPa。
The finite element analysis software ANSYS was used to simulate the quenching process of TC21 titanium alloy forging to obtain the distribution of temperature field and the distribution of thermal stress field of TC21 titanium alloy forging at different time and the change of the temperature and thermal stress of the selected node with the quenching time And observe the microstructure change from the heart to the edge of the forging, and study the influence of the cooling rate on the microstructure. The results show that when the surface is forgiven for 3600s, the surface of the forging has been cooled to room temperature, while the heart still maintains a high temperature. The cooling rate increases from the center of the forging to the surface, and the closer to the surface, the finer the structure. During the initial stage of quenching, the thermal stress rapidly increases to the maximum at each point of the forging. With the extension of the quenching time, the thermal stress on the surface and the core of the forging gradually decreases. At the end of quenching, the maximum residual stress of the forging is only 77 MPa.