采用分级淬火的实验方法,结合合金淬火态电导率和时效态硬度的测试拟合得到7003铝合金的时间-温度-转化率(TTT)曲线和时间-温度-性能(TTP)曲线,利用透射电镜(TEM)并结合Avrami方程研究了7003铝合金在等温过程中的组织变化.结果表明:当7003铝合金在相同温度下等温时,随保温时间延长,淬火态电导率呈上升趋势,时效态硬度呈下降趋势.透射电镜分析发现,在鼻温附近随保温时间的延长,晶粒内部析出相尺寸和间距变大,晶界析出相尺寸和间距变小,晶界无沉淀析出带变宽.实验用7003铝合金“C”曲线的鼻尖温度约为280℃,其孕育期约为10 s,淬火敏感温度区间较小,仅在鼻温附近淬火敏感性较高,而低温区和高温区淬火敏感性较低.实验用7003铝合金在线淬火时在鼻温附近应该以大于4℃/s的速度冷却,以抑制各种物相的析出.
参考文献
| [1] | Chakrabarti D J,Liu J,Sawtell R R,et al .New generation high strength high damage tolerance 7085 thick alloy product with low quench sensitivity[J].Materials Forum,2004,28 |
| [2] | 李培跃,熊柏青,张永安,李志辉,朱宝宏,王锋,刘红伟.7050高强铝合金淬火敏感性及组织特征[J].中国有色金属学报（英文版）,2012(02):268-274. |
| [3] | 刘胜胆,李承波,欧阳惠,邓运来,张新明,刘星兴.超高强7000系铝合金的淬火敏感性[J].中国有色金属学报,2013(04):927-938. |
| [4] | 刘胜胆,张新明,游江海,黄振宝,张翀,张小艳.7055铝合金的TTP曲线及其应用[J].中国有色金属学报,2006(12):2034-2039. |
| [5] | 刘胜胆,张新明,游江海,张小艳.微量锆对7055型铝合金淬火敏感性的影响[J].稀有金属材料与工程,2007(04):607-611. |
| [6] | 张新明,刘文军,刘胜胆,袁玉宝,邓运来.7050铝合金的TTP曲线[J].中国有色金属学报,2009(05):861-868. |
| [7] | 张新明,刘胜胆,游江海,张翀,张小艳.时效对7055铝合金淬火敏感效应的影响[J].中国有色金属学报,2007(02):260-264. |
| [8] | 李培跃,熊柏青,张永安,李志辉,朱宝宏,王锋,刘红伟.7050铝合金淬火特性与微观组织[J].中国有色金属学报,2011(03):513-521. |
| [9] | Dorward R C .A dynamic quench model for strength predictions in heat-treatable aluminum alloys[J].Journal of Materials Processing Technology,1997,6:25-29.,1997. |
| [10] | Robinson J S,Cudd R L,Tsnner D A .Quench sensitivity and tensile property in homogenity in 7010 forgings[J].Journal of Materials Processing Technology,2001,119:261-267.,2001. |
| [11] | LI H Y,GENG J F,ZHENG Z Q,et al .Continuous cooling transformation curve of a novel Al-Cu-Li alloy[J].Transactions Nonferrous Metals Society of China,2006,16(5):1110-1115.,2006. |
| [12] | 李红英,唐宜,曾再得,王法云,孙远.Al-Zn-Mg-Cu合金连续冷却转变曲线的测量[J].中国有色金属学报,2008(09):1613-1621. |
| [13] | HUANG Z Q,ZHOU X,YIN Z M,et al .Research on the quench sensitivity of aluminum alloys used for rail vehicle[J].Light Metal Age,2012,70 |
| [14] | 肖纪美.合金相与相变[M].冶金工业出版社,北京:2004,310-312.,2004. |
| [15] | Porter D A,Easterling K E.Phase Transformations in Metals and Alloys[M].London:Chapman & Hall Press,1992.,1992. |
| [16] | SHANG B C,YIN Z M,WANG G,et al .Investigation of quench sensitivity and transformation kinetics during isothermal treatment in 6082 aluminum alloy[J].Materials and Design,2011,32(7):3818-3822.,2011. |
| [17] | Staley J T .Quench factor analysis of aluminum alloys[J].Materials Science and Technology,1987,3:923-935.,1987. |
| [18] | Evancho J W,Staley J T .Kinetics of precipitation in aluminum alloys during continuous cooling[J].Metallurgical Transactions,1974,5(1):43-47.,1974. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%