Regression and re-aging heat treatment process for aviation 7175 aluminum alloy

• Main Authors: ZHAO ZHONGCHAO, SUN YOUZHENG, CAO SHANPENG, TANG HEZHUANG, WANG XINGRUI, ZHU PENGCHENG, GUO FENGJIA, SHI XIAOMING, JI QINGTAO
• Format: Patent
• Language: Chinese; English
• Published: 12.09.2023
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention belongs to the field of metal heat treatment, and particularly relates to an aviation 7175 aluminum alloy regression re-aging heat treatment process which is characterized by comprising the following steps: pre-aging treatment: heating a 7175 aluminum alloy extruded profile to 120 DEG C at the heating rate of 10 DEG C/min, and keeping for 10 hours; regression treatment is conducted, specifically, the 7175 aluminum alloy subjected to pre-aging treatment is heated to 185 DEG C, the heating rate is 40 DEG C/min, and the temperature is kept for 40 min; and aging treatment is conducted, specifically, the 7175 aluminum alloy extruded profile obtained after regression treatment is cooled to the room temperature and reheated to 120 DEG C, the temperature is kept for 10 h, and the heating rate is 10 DEG C/min. According to the regression re-aging process provided by the invention, on the premise of ensuring the strength, the corrosion resistance can be greatly improved, the aging treatment time is effect