在Gleeble-1500热模拟试验机上,通过高温压缩实验对316L不锈钢的热加工硬化特点和机制进行了研究.根据Ludwik幂函数模型对实验数据进行了非线性拟合,并用Crussard-Jaoul分析法计算了Ludwik幂函数模型的n值.实验结果表明:316L不锈钢在热变形过程中易发生加工硬化,真应力-应变曲线上未出现应力峰值;热变形过程中发生了部分动态再结晶,这一不完全的软化机制无法抵消热加工硬化的作用,另外在热变形过程中发生了孪生行为,这是热加工硬化的主要机制之一.
The characteristics of hot work-hardening for 316L stainless steel have been system-atically studied through high temperature compression tests on the Gleeble-1500 thermal simulation testing machine. According to Ludwik true stress-strain model, the experimental data has been re-gressed by using nonlinear fitting method, and the n value in Ludwik model, a comprehensive index which reflects the competitive result between work-hardening and softening, has been calculated with Crussard-Jaoul method. The dynamic recrystallization and twinning were observed by OM and TEM. The experiments reveal that 316L stainless steel is easy to work-hardening during hot deformation,and deformation rate can effect n~(C-J)-ε curves and variation law; There is no peak stress on its true stress-strain curves, but partial dynamic recrystallization has occurred during hot working process. This incomplete softening mechanism can't counteract the effect of hot work-hardening, so the true stress-strain curves still rise with deformation increasing; In addition, twinning occurred during hot working is one of the major mechanisms of hot work-hardening.
参考文献
| [1] | ASM,translated by Ma J R,Chen L M.Metals Handbook.Beijing:Machinery Industry Press,1994; 7(ASM,马九荣,陈立敏译.金属手册.北京:机械工业出版社,1994:7) |
| [2] | Wang S T,Yang K,Shan Y Y,Li L F.Acta Metall Sin,2007; 43:171(王松涛,杨柯,单以银,李来风.金属学报,2007;43:171) |
| [3] | Soussan A,Degallaix S.Mater Sci Eng,1991; A142:169 |
| [4] | Ludwigson D C,Berger J A.JISI,1969; 207:63 |
| [5] | Simmons J W.Acta Mater,1997; 45:2467 |
| [6] | Lan S H,Lee H J,Lee S H.Mater Des,2009; 30:3881 |
| [7] | Jha B K,Ram A,Sagar D V.J Mater Sci Lett,1987; 6:891 |
| [8] | Mejia I,Maldonado C,Benito J A.Mater Sci Forum,2006; 509:37 |
| [9] | Remy L.Metall Trans,1981; 12A:387 |
| [10] | Karaman I,Sehitoglu H,Maier H J.Acta Mater,2001;.49:3919 |
| [11] | Poliak E I,Jonas J J.ISIJ Int,2003; 43:684 |
| [12] | McQueen H J,Yue S,Ryan N D,Fry E.J Mater Process Technol,1995; 53:293 |
| [13] | Adler P H,Olson G B,Owen W S.Metall Trans,1985; 17A:1725 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%