Transactions of Materials and Heat Treatment

Title：Coarse grain problem in isothermal forming forgings for 2618 aluminum alloy support

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ClassificationCode：TG146.2+1；TG319

year,vol(issue):pagenumber：2022,47(1):30-35

Abstract：

2618 aluminum alloy is widely used in the aerospace industry because of its good heat resistance, good plasticity in hot state and good process performance during plastic deformation. However, due to the low content of trace elements that inhibit grain growth in 2618 aluminum alloy, the forgings often suffer from coarse grain problem during plastic deformation resulting in reducing the mechanical properties and affecting the quality of forgings. Therefore, two kinds of 2618 aluminum alloy original bars, namely, Φ165 mm produced in China and Φ160 mm imported from abroad, were used respectively, and the 2618 aluminum alloy support forgings were forged by isothermal forming technology. The research results show that the support forgings made of Φ165 mm 2618 aluminum alloy extruded bar produced in China has obvious coarse grains after heat treatment, and the whole process of isothermal die forging and heat treatment of the original materials was studied by the actual forgings in proportion. It is found that the Φ165 mm 2618 aluminum alloy original bar produced in China has a subcrystalline structure of 3-5 mm at the outer edge after the coarse grain ring is removed, which is a transitional structure that quickly grows into coarse grains when heated, and it must be removed in advance. Based on this, a solution is proposed to solve the coarse grain problem, and the support forgings with the grain size meeting the requirements are obtained, which provides an effective method for solving the coarse grain problem of 2618 aluminum alloy forgings.

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作者简介：李宏伟（1974-），男，学士，高级工程师 E-mail：15046786858@139.com 通信作者：袁林（1979-），男，博士，教授 E-mail：yuanlin@hit.edu.cn

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