去应力退火工艺对锻造TA7钛合金切削性能的影响

doi:10.3901/JME.2022.13.298

机械工程学报 ›› 2022, Vol. 58 ›› Issue (13): 298-306.doi: 10.3901/JME.2022.13.298

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去应力退火工艺对锻造TA7钛合金切削性能的影响

孙富建^1,2, 肖罡^1,2,3,4, 蒋志贤^1,2, 李时春^1,2, 万可谦³

1. 湖南科技大学难加工材料湖南省重点实验室湘潭 411201;
2. 湖南科技大学机电工程学院湘潭 411201;
3. 江西科骏实业有限公司南昌 330100;
4. 湖南大学汽车车身先进设计制造国家重点实验室长沙 410082

收稿日期:2021-07-19 修回日期:2022-03-16 出版日期:2022-07-05 发布日期:2022-09-13
通讯作者: 肖罡(通信作者),男,1983年出生,博士,高级工程师。主要研究方向为复杂零构件高效成形技术。E-mail:xg_1221@163.com
作者简介:孙富建,男,1986年出生,博士,副教授。主要研究方向为高效精密加工技术。E-mail:lancesfj@126.com
基金资助:
国家自然科学基金青年基金（51805165，52075159）和湖南省自然科学基金青年基金（2019JJ50195）资助项目。

Influence of Stress Relieving Annealing Process on Forging TA7 Titanium Alloy Machinability

SUN Fujian^1,2, XIAO Gang^1,2,3,4, JIANG Zhixian^1,2, LI Shichun^1,2, WAN Keqian³

1. Intelligent manufacturing institute, Hunan University of Science and Technology, Xiangtan 411201;
2. School of Mechanical Engineering, Hunan University of Science and Technology, Xiangtan 411201;
3. Jiangxi KMAX Industrial Co., Ltd., Nanchang 330100;
4. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082

Received:2021-07-19 Revised:2022-03-16 Online:2022-07-05 Published:2022-09-13

摘要/Abstract

摘要： TA7钛合金(Ti-5Al-2.5Sn)在退火状态下具有良好的室温和高温断裂韧度，而锻造TA7钛合金必需经过去应力退火，才能进行切削加工，去应力退火成为锻造工序与切削加工工序间的中间环节，通过微观结构的变化能够调控力学性能和切削加工性能。在600℃、800℃、1 000℃下对锻造TA7钛合金进行去应力退火，获得了三种不同的微观组织。800℃试样的细小次生α相和等轴初生α相降低了切削温度、切削力，加剧了切屑的锯齿状结构的形成；1 000℃试样的片状β相和粗大α相降低了切削温度，增大了切削力，恶化了切屑的锯齿状结构，但降低了切屑的凸起角和剪切应变。

关键词: TA7钛合金, 去应力退火, 微观结构, 力学性能, 切削加工性能

Abstract: TA7 titanium alloy (Ti-5Al-2.5Sn) has excellent room temperature and high temperature fracture roughness in annealed state. Especially, after undergoing stress relieving annealing the forging TA7 titanium alloy can be machined. The stress relieving annealing is a link between the forging process and machining process, can regulate and control the mechanical properties and machinability of workpiece through the change of microstructure. In this paper forging TA7 titanium alloy was stress relieving annealed at the temperatures of 600℃, 800℃, 1 000℃, three microstructures were gained. The fine secondary α phase and equiaxed primary α phase of the 800℃ specimen reduced cutting temperature and cutting forces, intensified the formation of the chip serrated structure. The lamellar β phase and coarse α phase of the 1 000℃ specimen decreased the cutting temperature, increased the cutting forces, intensified the formation of the chip serrated structure, but reduced the chip bulge angle and the chip shear strain.

Key words: TA7 titanium alloy, stress relieving annealing, microstructure, mechanical properties, machinability

中图分类号:

GT506

孙富建, 肖罡, 蒋志贤, 李时春, 万可谦. 去应力退火工艺对锻造TA7钛合金切削性能的影响[J]. 机械工程学报, 2022, 58(13): 298-306.

SUN Fujian, XIAO Gang, JIANG Zhixian, LI Shichun, WAN Keqian. Influence of Stress Relieving Annealing Process on Forging TA7 Titanium Alloy Machinability[J]. Journal of Mechanical Engineering, 2022, 58(13): 298-306.

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去应力退火工艺对锻造TA7钛合金切削性能的影响

Influence of Stress Relieving Annealing Process on Forging TA7 Titanium Alloy Machinability

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