Cu-Al-Ni-Fe-Mn铝青铜固溶加二级时效工艺的试验研究
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摘要
采用热分析法确定了试验铝青铜的相变点。在此基础上,对其进行了以二级时效工艺参数为因素,以力学性能为考核指标的正交试验研究,分析了合金的显微组织,并与单级时效工艺后合金的组织和性能进行了对比。结果表明:试验铝青铜的相变点为902.3℃,最佳二级时效工艺参数为200℃×2.5 h+500℃×2.5 h。在采用固溶(940℃×2 h)+最佳二级时效工艺处理后合金的抗拉强度为934 MPa,硬度为239.6HB,断后伸长率为13.3%,与采用固溶(940℃×2 h)+时效(500℃×3 h)处理相比,分别提高10.27%、30.28%、4.72%,组织中第二相颗粒更加细小且弥散。
The phase transition point of the test aluminum bronze was determined by thermal analysis method. On this basis, taking two-stage aging process parameters as factors, and taking mechanical properties as evaluation index, the orthogonal experimental study of aluminum bronze was carried out. The microstructure of the alloy was analyzed,and the microstructure and properties of the alloy were compared with those of the single stage aging process. The results show that the phase transformation point of the aluminum bronze is 902.3℃; the optimum two-stage aging process parameters are 200℃×2.5 h+500℃×2.5 h. After the solution(940℃×2 h)+optimum two-stage aging treatment, the tensile strength of the alloy is 934 MPa, hardness is 239.6 HB and elongation is 13.3%,which increase by 10.27%, 30.28% and 4.72% respectively,compared with solid solution(940℃×2 h)+ aging treatment(500℃×3 h). The second phase particles in the microstructure are finer and more dispersed.
The phase transition point of the test aluminum bronze was determined by thermal analysis method. On this basis, taking two-stage aging process parameters as factors, and taking mechanical properties as evaluation index, the orthogonal experimental study of aluminum bronze was carried out. The microstructure of the alloy was analyzed,and the microstructure and properties of the alloy were compared with those of the single stage aging process. The results show that the phase transformation point of the aluminum bronze is 902.3℃; the optimum two-stage aging process parameters are 200℃×2.5 h+500℃×2.5 h. After the solution(940℃×2 h)+optimum two-stage aging treatment, the tensile strength of the alloy is 934 MPa, hardness is 239.6 HB and elongation is 13.3%,which increase by 10.27%, 30.28% and 4.72% respectively,compared with solid solution(940℃×2 h)+ aging treatment(500℃×3 h). The second phase particles in the microstructure are finer and more dispersed.
引文
[1]张大童,陈瑞萍,罗宗强,等.热处理温度对高强变形铝青铜的组织和力学性能的影响[J].稀有金属,2010(7):521-525.
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[3]庄楚强,何春雄.应用数理统计基础[M].广州,华南理工大学出版社,2006:249-252.
[4]王智平,李海兰.固溶时效对高铝青铜组织与性能的影响[J].铸造,2004,53(6):439-442.
[5]王永朝,刘国元,付自来,等.弥散强化铜弥散相特征与其性能的关系[J].材料开发与应用,2012(8):27-32.
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[2]杨修波. Al-Zn-Mg(Cu)合金旳热处理、微观结构与性能研究[D].长沙:湖南大学,2014.
[3]庄楚强,何春雄.应用数理统计基础[M].广州,华南理工大学出版社,2006:249-252.
[4]王智平,李海兰.固溶时效对高铝青铜组织与性能的影响[J].铸造,2004,53(6):439-442.
[5]王永朝,刘国元,付自来,等.弥散强化铜弥散相特征与其性能的关系[J].材料开发与应用,2012(8):27-32.
[6] Kaplan M, Yildiz A K. The effects of production methods onthe microstructures and mechanical properties of an aluminumbronze[J].MaterialsLetters,2003,57:4402-4411.