基于马氏体区域化形成的免训练铸造Fe-Mn-Si-Cr-Ni形状记忆合金 II.退火对形状记忆效应的影响_图文

1、46320103288293ACTA METALLURGICA SINICA Mar. 2010pp.288293 FeMnSiCrNiII .(,610065OMFe18Mn5.5Si9.5Cr4Ni.,7731173K.973K30min ,6.4%,4Fe14Mn5Si8Cr-4Ni 1.2%.1173K 30min, ,;1273K, ,.1423K , ,.,.FeMnSiCrNi,A0412 1961(201003 0288 06A TRAININGFREE CAST FeMnSiCrNi SHAPE MEMORY ALLOY BASED ON FORMATION OF MARTE

2、NSITE IN A DOMAIN MANNER II. Inuence of annealing on shape memory eectLIU Gang, PENG Huabei, WEN Yuhua, YANG Kun, LI NingCollege of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065Correspondent:WEN Yuhua, professor, Tel:(02866871966, E-mail:wenyhmse Supported by National Nat

3、ural Science Foundation of China (Nos.50501015and 50871072 andProgramfor New Century Excellent Talents in University (No.NCET060793Manuscript received 20090924, in revised form 20091218ABSTRACT The microstructure and memory property evolutions of ascast Fe18Mn5.5Si 9.5Cr4Ni alloy with annealing temp

4、erature were investigated using OM, ferrite measuring instrument and bending method. The results showed that when the ascast Fe18Mn5.5Si9.5Cr4Ni alloy was annealed between 773and 1173K, its shape memory eect (SMEwas further improved. A high recovery strain of 6.4%was obtained only through annealing

5、the ascast alloy at 973K for 30min, which is 1.2%higher than that of the conventional Fe14Mn5Si8Cr4Ni alloy after four times thermomechanical training. When the ascast Fe18Mn5.5Si9.5Cr4Ni alloy was annealed below 1173K for 30min, the morphology of ferrite phase was still lathy and it could make the

6、stressinduced martensite form in a domain manner during deformation, which is the reason why the good SME was obtained in the ascast alloy annealed below 1173K for 30min. When the annealing temperature was above 1273K, the ferrite phase would dissolve in the austenite and its amount de-creased. When

7、 the annealing temperature was further increased to 1423K, the amount of ferrite phase*5050101550871072NCET060793:20090924,:20091218:, 1986,3:FeMnSiCrNi II. 289 remarkably increased and its morphology evolved into the island from the lath. The austenite grains could not be well subdivided into small

8、er domains due to the decrease of lathy ferrite phase or the formation of island ferrite phase. The SME of this ascast alloy dramatically decreased when annealed above 1273K.KEY WORDS FeMnSiCrNi shape memory alloy, trainingfree, cast, annealing temperature, lathy ferrite, FeMnSi1 3. Kubo 1Fe28Mn6Si5

9、Cr0.5Ni(, %, , 1423K,2.4%.Li 2Zhao 3 Fe14Mn6Si9Cr5Ni Fe14Mn6Si9Cr5Ni0.25C , 1473K 2.85%.1 3,. ,.4, Fe18Mn5.5Si9.5Cr 4Ni , , , . , 4.9% Fe18Mn5.5Si9.5Cr4Ni . , Fe18Mn5.5Si9.5Cr4Ni, . 14Fe18Mn5.5Si 9.5Cr4Ni 150mm 2mm 1.5mm , 30min .Fe14Mn5Si8Cr4Ni4(5%, 923K 15min .5.OLYM-PUS CK40M (OM, 6.FERITSCOPE MP

10、30ES FISCHY, 30mm 30mm 5mm. M s.213.6%, 30min Fe18Mn5.5Si9.5Cr4Ni. , , 973K 94%,11%. , . 1173K , , 1423K 22%.2973K 30min Fe18Mn 5.5Si9.5Cr4Ni 4Fe 14Mn5Si8Cr4Ni 1Fe18Mn5.5Si9.5Cr4NiFig.1Eect of annealing temperature on the shape recov-ery ratio of ascast Fe18Mn5.5Si9.5Cr4Ni alloy after 3.6%bending de

11、formation2973K 30min Fe18Mn5.5Si9.5Cr 4Ni 4Fe14Mn5Si8Cr4NiFig.2Relationships between recovery strain and initial strain of the Fe18Mn5.5Si9.5Cr4Ni alloy ascast and annealed as well as Fe14Mn5Si8Cr4Ni alloy trained by 4times29046.,973K30min, Fe18Mn5.5Si9.5Cr4Ni,12.4%6.4%.,973K30min,4Fe14Mn5Si8Cr4Ni1.

12、2%.330min Fe18Mn 5.5Si9.5Cr4NiOM . , , 973K , ;,1073K 3Fe18Mn5.5Si9.5Cr4NiOMFig.3Color OM images of Fe18Mn5.5Si9.5Cr4Ni alloy ascast (aand annealed at 973K (b,1073K (c,1173K (d,1273K (eand 1423K (ffor 30min3:FeMnSiCrNiII.291;1173K ,;1273K , ;1423K, M s430minFe18Mn5.5Si9.5Cr4NiM s . , ,1173K 4Fe18Mn5

13、.5Si9.5Cr4Ni M sFig.4Eects of annealing temperature on volume fractionof the ferrite and M s of the Fe18Mn5.5Si9.5Cr 4Ni alloy;1273K,;,1423K. ,873KM s11K;M s ,1073K286K;1173K , M s282K. M s.5Fe18Mn5.5Si9.5Cr4Ni 6%OM . ,1173K ,;12731423K,. 973K6%,1423K.615%973K30minFe18Mn5.5Si9.5Cr4Ni723KOM . , 15%,

14、2,. 2,6a.723K,. 5Fe18Mn5.5Si9.5Cr4Ni 6%OMFig.5Color OM images of Fe18Mn5.5Si9.5Cr4Ni alloys ascast (aand annealed at 973K (b,1073K (c,1173K (d,1273K (eand 1423K (ffor 30min after 6%tensile deformation at room temperature29246 615%973K 30min Fe18Mn5.5Si9.5Cr4Ni723K OMFig.6In situ color OM images of F

15、e18Mn5.5Si9.5Cr4Ni alloys annealed at 973K for 30min after 15%tensile deformation at room temperature (aand then recoveryannealed at 723K (b3, Fe18Mn5.5Si9.5Cr4Ni 1073K30min , ,(4. 1173K , ., 1273K 7, . 1423K , 7, , ,.1423K 30min Fe18Mn5.5Si9.5Cr4NiM s973K(293K, (1. , M s2Fe18Mn 5.5Si9.5Cr4Ni. FeMnS

16、i 8 11.,., . , ,.,.,. Fe18Mn5.5Si9.5Cr4Ni1173K 30min , ,(5, .,1273K , .1423K,. ,973K30minFe18Mn5.5Si9.5Cr4Ni ,1423K 30min (1., FeMnSi,.,.15%, 973K30minFe 18Mn5.5Si9.5Cr4Ni. ,(6., 973K 30min 6.4%,4Fe 14Mn5Si8Cr4Ni1.2%(2. , 15%2, 2, .973K 30min12.4%. FeMnSi,12 16.,6.4%Fe18Mn5.5Si9.5Cr4Ni .FeMnSi . , ,

17、FeMnSi.4(17731173KFe18Mn5.5Si9.5Cr4Ni,973K 30min ,6.4%,43 : FeMnSiCrNi II. 293 Fe14Mn5Si-8Cr4Ni 1423 K 4Ni . (2 1173 K ; , , . (3 9.5Cr4Ni FeMnSi . , , Fe MnSi . 1.2%. 1273 , Fe18Mn5.5Si9.5Cr , 30 min Fe18Mn5.5Si9.5Cr4Ni 30 min , , , 1273 K, . 1423 K , , . , 6.4% Fe18Mn5.5Si . 1 Kubo H, Ostuka H, Fa

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