将石膏型熔模铸造和反重力铸造工艺相结合,在不同充型压力下制备 ZM5镁合金,研究了充型压力对镁合金石膏型薄壁件成形能力及合金铸态组织和拉伸性能的影响,得到了最佳的铸造工艺参数.结果表明:随着充型压力增大,铸态镁合金的组织明显细化;当充型压力为40 kPa时,铸件的成形能力最好,镁合金的拉伸性能最佳,抗拉强度为(192±5)MPa,伸长率为(1.5±0.2)%;330~350℃的铸型预热温度、730~750℃的浇注温度、35~40 kPa 的充型压力能够满足镁合金薄壁件浇注的需要.
ZM5 magnesium alloy was prepared at different filling presures by combining gypsum mould and counter gravity casting process, and the effects of filling pressure on filling ability of thin-wall casting, microstructure and tensile properties of as-cast magnesium alloy were studied.At last, the optimal casting parameters were obtained.The results show that,with the increase of filling pressure,the casting microstructure was obviously refined.The optimal filling pressure with maximum tensile properties was 40 kPa at which the filling ability of the thin-wall casting was better and tensile strength was (192±5)MPa,elongation was (1.5±0.2)%. The casting process with preheating temperature of 330-350 ℃,pouring temperature of 730-750 ℃ and filling pressure of 35-40 kPa can meet the need of thin-wall castings of magnesium alloy.
参考文献
[1] | 金军兵;王智祥;刘雪峰;谢建新.均匀化处理对AZ91镁合金组织和力学性能的影响[J].金属学报,2006(10):1014-1018. |
[2] | 刘畅;周宏;孙广平;李伟.稀土对AM60B镁合金组织遗传性和性能的影响[J].机械工程材料,2007(2):5-8. |
[3] | 冯凯;黄晓锋;马颖;陈娟娟;郝远.固溶时间对ZA72镁合金显微组织及力学性能的影响[J].中国有色金属学报,2011(9):2035-2042. |
[4] | 翟春泉;曾小勤;丁文江;王渠东;吕宜振;徐小平.镁合金的开发与应用[J].机械工程材料,2001(1):6-10. |
[5] | Pettersen G.;Ovrelid E.;Tranell G.;Fenstad J.;Gjestland H..Characterisation of the surface films formed on molten magnesium in different protective atmospheres[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,20021/2(1/2):285-294. |
[6] | 张守银;余欢;严青松;徐志锋.反重力铸造数值模拟研究进展[J].铸造技术,2010(12):1663-1666. |
[7] | 蒋文明;樊自田;刘德均.铝、镁合金真空低压消失模壳型铸造的缺陷分析[J].特种铸造及有色合金,2012(4):311-314. |
[8] | 杨柳青;康永林;张帆;丁瑞华;李炯.铸造压力对AZ91D镁合金流变压铸件致密性的影响[J].特种铸造及有色合金,2010(7):630-632. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%