锻压技术

半固态触变模锻7A04合金的力学性能

英文标题：Mechanical properties of semi-solid thixoforging 7A04 alloy parts

作者：田文彤

单位：常州工学院

关键词：半固态触变模锻 7A04合金力学性能

分类号：TG316.3

出版年,卷(期):页码：2012,37(5):63-66

摘要：

采用2000 kN压力机，对半固态7A04合金进行了触变模锻实验。结果表明：半固态触变模锻成形可以获得组织致密、轮廓清晰、充型完整的成形件；半固态触变模锻件的微观组织和力学性能与坯料的制备方法有关，采用SIMA法所获得的成形件的微观组织为晶粒细小、均匀的再结晶组织，因此其组织致密，在拉伸过程中部分晶粒发生塑性变形，断口中多处出现撕裂棱，其力学性能明显好于挤压态坯料；在加热温度为600 ℃、保温时间为10 min时SIMA坯料模锻件的伸长率和抗拉强度最高，接近于热挤压态棒料的力学性能，优于同等条件下挤压态合金的半固态模锻成形件，其抗拉强度和伸长率分别提高11.8%和78.5%。

Thixoforging tests were conducted on a 2000 kN press to form semi-solid 7A04 alloy parts. The results show that integrally formed part with compact structure and clear shape is obtained by thixoforging process. The microstructure and mechanical properties of thixoforging parts are related to their billets making method. The microstructure of such parts made by SIMA method is mainly the fine and uniform recrystallization texture. In addition, plastic deformation was found locally during the elongated process and tearing ridges were found at fracture surfaces, which make the mechanical properties of thixoforging parts superior to that of extruded billet. The elongation rate and strength of thixoforging parts came to the highest value when the SIMA billet was reheated to 600 ℃ for 10 min, which is similar to that of hot extruding billet. Compared to the extruded state, the strength and elongation rate made by SIMA method were increased to 11.8% and 78.5%, respectively.

基金项目：

江苏省高校自然科学基础研究资助项目（07KJD460007）

参考文献：

［1］王金国. 应变诱发法镁合金AZ91D半固态组织演变机制[D]. 长春：吉林大学, 2005.
［2］Chayong S, Atkinson H V, Kaprnos P. Thixoforming 7075 aluminum alloys[J]. Materials and Engineering A, 2005, 1/2 (390): 3-12.
［3］肖潇. 镁合金机车零件半固态压铸成形工艺及模具设计研究[D]. 北京：北京交通大学, 2008.
［4］郭洪民, 杨湘杰. 流变压铸YL112铝合金的热处理与力学性能[J]. 中国有色金属学报, 2008, 13 (3): 394-399.
［5］侯文杰, 谭建波, 刘江成. 半固态流变压铸的研究现状与发展趋势[J]. 铸造技术, 2009, 30 (1): 91-94.
［6］Flemings M C, Martinez R A. Principles of microstructural formation in semi\|solid metal processing[A]. Proceedings of the 9th on Semi\|solid Processing of Alloys and Composites[C]. Pusan, 2006.
［7］张友法. 触变注射成形镁合金组织和性能研究及成形模拟[D]. 长春：吉林大学, 2008.
［8］陆萍. SIMA法AZ91D镁合金半固态坯料的制备[D]. 长春：吉林大学, 2005.
［9］吉建立. ZL101过流冷却转移法半固态压铸工艺及性能研究[D]. 昆明：昆明理工大学, 2010.
［10］董维国, 王平, 路贵民,等. ZL116合金的半固态模锻成形组织与性能[J]. 东北大学学报：自然科学版, 2007, 8(28): 1127-1130.
［11］田文彤, 杨辉. 7A04合金半固态触变模锻的组织演化[J]. 锻压技术, 2008, 33 (5): 85-87.
［12］李璐, 周荣锋, 岑启宏，等. ZL101过流冷却转移法半固态压铸工艺及性能研究[J]. 特种铸造及有色合金, 2011, 31 (10): 906-910.

服务与反馈：

【文章下载】【加入收藏】