采用电阻法和OM等手段研究了不同温度区间的热循环对Fe-14Mn-5.5Si-8Cr-5Ni合金微观组织和形状记忆效应的影响。结果表明：298 K～353 K、520 K、773 K和77 K～773 K热循环1次后,合金形状回复率均大幅度提高;298～773 K循环5次后的形状回复率提高了26%,77～773 K热循环5次后的形状回复率提高了36%。热循环显著减少了因淬火热应力导致的热诱发ε马氏体量,并且热诱发ε马氏体的逆转变向基体引入了大量的堆垛层错。与固溶态相比,热循环后再变形不仅使α＇马氏体的数量显著减少,而且应力诱发ε马氏体以区域化的方式形成,因而合金的形状记忆效应显著提高。77～773 K的热循环比298～773 K的热循环更能显著提高合金形状记忆效应的原因是由于其引入了更多的堆垛层错。
Evolutions of microstructure and shape memory effect of a Fe-14Mn-5.5Si-8Cr-5Ni alloy with thermal cycling were investigated by OM observation and resistivity measurement. The results show that the shape recovery rate is markedly enhanced after one thermal cycle in the temperature range of 298 K-353 K,520 K,773 K and 77-773 K. The shape recovery rate increases by 26% and 36% after five thermal cycles of between 298-773 K and 77-773 K, respectively. The thermal cycling not only decreases remarkably the amount of thermal-induced e martensite produced by the quenching thermal stress, but also introduces lots of stacking faults resulting from the reverse transformation of thermal-induced e martensite. Compared to the solution treated alloy, the amount of ct＇ martensite after deformation decreases significantly, and the stress-induced e martensite forms in a domain manner after thermal cycling. This is the reason of the remarkable improvement of shape memory effect after thermal cycling. Because more stacking faults are introduced by the thermal cycling in the range of 77-773 K than that of 298-773 K, the shape memory effect is improved more remarkably by the thermal cycling of 77-773 K.
参考文献
| [1] | Sato A;Chishima E;Soma K et al.Shape memory effect in transformation in Fe-30Mn-1Si alloy single crystals[J].Acta Metallurgica,1982,30(06):1177-1183. |
| [2] | Sato A;Yamaji Y;Mori T .Physical properties controlling shape memory effect in Fe-Mn-Si alloys[J].Acta Metallurgica,1986,34(02):287-294. |
| [3] | Otsuka H;Yamada H;Maruyama T et al.Effects of alloying additions on Fe-Mn-Si shape memory alloys[J].ISIJ International,1990,30(88):674-679. |
| [4] | Inagaki H .Shape memory effect of Fe-14% Mn-6% Si-9% Cr-6% Ni alloy polycrystalls[J].Zeitschrift fur Metallkunde,1992,83(02):90-96. |
| [5] | Bohong Jiang;Xuan Qi;Weiming Zhou;Zheng Lei Xi;T. Y. Hsu .The effect of nitrogen on shape memory effect in Fe-Mn-Si alloys[J].Scripta materialia,1996(9):1437-1441. |
| [6] | S. Kajiwara .Characteristic features of shape memory effect and related transformation behavior in Fe-based alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1999(0):67-88. |
| [7] | S. Kajiwara;D. Liu;T. Kikuchi .REMARKABLE IMPROVEMENT OF SHAPE MEMORY EFFECT IN Fe-Mn-Si BASED SHAPE MEMORY ALLOYS BY PRODUCING NbC PRECIPITATES[J].Scripta materialia,2001(12):2809-2814. |
| [8] | Wen Y H;Yan M;Li N .Effects of carbon addition and aging on the shape memory effect of Fe-Mn-Si-Cr-Ni alloys[J].Scripta Materialia,2004,50(04):441-444. |
| [9] | Stanford N;Dunne DP;Li H .Re-examination of the effect of NbC precipitation on shape memory in Fe-Mn-Si-based alloys[J].Scripta materialia,2008(7):583-586. |
| [10] | Y.H. Wen;H.B. Peng;P.P. Sun .A novel training-free cast Fe-18Mn-5.5Si-9.5Cr-4Ni shape memory alloy with lathy delta ferrite[J].Scripta materialia,2010(2):55-58. |
| [11] | Wang, C.P.;Wen, Y.H.;Peng, H.B.;Xu, D.Q.;Li, N. .Factors affecting recovery stress in Fe-Mn-Si-Cr-Ni-C shape memory alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2011(3):1125-1130. |
| [12] | 胥冬琴,彭华备,刘刚,文玉华.不同退火温度热机械处理对Fe-Mn-Si-Cr-Ni合金记忆效应的影响[J].材料热处理学报,2011(03):30-34. |
| [13] | L. J. Rong;Y. Y. Li;C. X. Shi .Improvement of shape memory effect in an Fe-Mn-Si-Cr-Ni alloy[J].Scripta materialia,1996(6):993-998. |
| [14] | Wang DF.;Dong ZZ.;Liu WX.;Chen JM.;Liu DZ. .Improvement of shape memory effect by ausforming in Fe-28Mn-6Si-5Cr alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(1/2):174-179. |
| [15] | Tsuzaki K;Ikegami M;Tomota Y et al.Effect of thermal cycling on the martensitic transformation in an Fe-24Mn-6Si shape memory alloy[J].Materials Transactions-Japan Institute of Metals,1992,33(03):263-270. |
| [16] | Y.Tomota;Y.Morioka;W.Nakagawara .Epsilon martensite to austenite reversion and related phenomena IN Fe-24Mn and Fe-24Mn-6Si alloys[J].Acta materialia,1998(4):1419-1426. |
| [17] | Ghosh G;Vanderveken Y;Humbeeck J V.Influnce of cycling,aging and heat treatment on the martensitic transformation and shape recovery of Fe-Mn-Si alloys[M].Pittsburgh:Materials Research Society,1989:457-461. |
| [18] | Yuhua WEN,Ning LI,Mingjing TU.Factors Affecting Transformation Temperatures in Fe-Mn-Si-Cr-Ni Shape Memory Alloy[J].材料科学技术学报(英文版),2000(05):537-539. |
| [19] | 何刚,赵恒北,戎咏华,郭正洪,陈世朴,徐祖耀.层错几率峰位移测定法及在Fe-Mn-Si合金中的应用[J].上海交通大学学报,1999(07):765-768. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%