|
|
|
| THE LOW CYCLIC FATIGUE BEHAVIOUR OF GH133 SUPERALLOY |
| CHEN Guoliang;WANG Jingzhi Beijing University of Iron and Steel Technology;WANG Haiqing;CHEN Hong Institute of Aeronautical Materials;Beijing |
|
Cite this article:
CHEN Guoliang;WANG Jingzhi Beijing University of Iron and Steel Technology;WANG Haiqing;CHEN Hong Institute of Aeronautical Materials;Beijing. THE LOW CYCLIC FATIGUE BEHAVIOUR OF GH133 SUPERALLOY. Acta Metall Sin, 1985, 21(2): 59-144.
|
|
|
Abstract The cyclic stress-strain response and microstructure were studied on LCF speci-mens of 15Cr-27Ni-1.8Ti-Fe alloy.The strain control LCF tests were performedat 600℃ under two different wave shapes:R=-1 and fixed ε_(max).Comparingthe results of these tests,the detrimental effect of average tensile stress was prov-ed.This was concerned with the influence of tensile stress on the movements ofdislocations and the formation of cracks.The observations of dislocation structure indicated that during the cyclingboth mechanisms caused cyclic hardening and cyclic softening were taking place.Cyclic strain led to generate the stress field at the interface of γ and γ′phasesfirst.As a result of increasing stress field the dislocations were created.The densi-ty of dislocation was further increased by the movement of dislocations themself.The interactions between dislocations and γ′particles degenerated from pair disloca-tion cutting γ′particles to single dislocation cutting γ′particles.It led to formmore faults and ABP's,and the γ′particles became propressively harder to shearand ultimately led to dislocations looping around particles.A typical dislocation structure of persistant slip band,ladder-like structure,wasseen as a saturated dislocation structure in the slip band,and the more ladder-likestructure formed,the more cyclic softening happened.The slip band extends to grain boundaries and twin boundaries.The grain disloca-tion interacted with boundaries,and led to complex boundary dislocation struc-ture.The density of dislocation near grain boundaries and twin boundaries wasmuch higher than others since the boundaries can acted as the barrier and disloca-tion generator.This would cause to form grain boundary cracks and twin boun-dary cracks.
|
|
Received: 18 February 1985
|
1 Anton,D.L.;Fine,M.E.,Metall.Trans.,13A(1982) ,1187．
2 Wells,C.H.;Sullivan,C.P.,ASM Trans.Q.,57(1964) ,841．
3 Stoltz,R.E.;Pineau,A.G.,Mater.Sci.Eng.,34(1978) ,275．
4 Calabrese,C.;Laird,C.,Mater.Sci.Eng.,13(1974) ,141．
5 Bhat,S.P.;Laird,C.,Acta Metall.,27(1979) ,1873．
6 Broom,T.;Mazza,J.A.;Whittaker,V.N.,J.Inst.Met.,86(1957/58) ,17．
7 Sargent,C.M.;Purdy,G.R.,Scr.Metall.,8(1974) ,569．
8 Abel,A.;Ham,R.K.,Acta Metall.,14(1966) ,1495．
9 Cowles,B.A.;Sims,D.L.;Warren,J.R.;Miner,R.V.,Trans.ASME,Ser.H:J.Eng.Mater.Technol.,102(1980) ,356．
10 Kear,B.H.;Leverant,G.R.;Oblak,J.M.,ASM Trans.Q.,62(1969) ,639．
11 Raynor,D.;Silcock,J.M.,J.Mater.Sci.,4(1970) ,121．
12 Flinn,P.A.,Trans.Metall.Soc.AIME,218(1960) ,145．
13 Kear,B.H.;Wilsdorf,H.G.F.,Trans.Metall.Soc.AIME,224(1962) ,382．
14 Vidoz,A.E.;Brown,L.M.,Philos.Mag.,7(1962) ,1167 |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
