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| STRAIN FIELD OF HYDROGEN ATOMS IN IRON |
| ZHANG Tongyi;CHU Wuyang;XIAO Jimei Beijing University of Iron and Steel Technology |
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Cite this article:
ZHANG Tongyi;CHU Wuyang;XIAO Jimei Beijing University of Iron and Steel Technology. STRAIN FIELD OF HYDROGEN ATOMS IN IRON. Acta Metall Sin, 1985, 21(5): 42-50.
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Abstract The difference between the chemical potential,μ_σ,of hydrogen atoms produ-cing a non-spherical symmetry strain in a solid sample under stress and that,μ_0corresponding to the state without stress has been studied.It is shown that μ_σ-μ_0=■=U,where σ_1——principal stress,■——strain component along thedirection of the principal stress,V——volume and U——interaction energy betweenthe strain field and external stress field.The hydrogen atoms producing the tetragonally symmetric strain are preferen-tially ordered in samples under stress.As a result,the variation of hydrogenconcentration with tensile stress σ will be different from that with compressive stressσ.For a general polycrystal the formulas are respectively■where C_t,C_p,C_0——hydrogen concentraiton under tensile stress,compressive stressand without stress respectively.Hence,ε_(11)/ε_(22)may be determined in terms of C_t/C_pwhich can be obtained by hydrogen permeation measurement.For example,according to Bockris's data,ε_(11)/ε_(22)=1.27 at temperature of 27℃ which impliesthat the strain field of hydrogen atoms in α-Fe is non-spherical symmetry.For a torsional stress τ,U=-0.55133Vτ(ε_(11)-ε_(22)).The interaction can resultin the enrichment of hydrogen atoms and hydrogen induced delayed crackingalong the planes inclined at an angle of α=45°to torsional axis,which was ob-served in pre-charged smooth torsional or type Ⅲ cracked specimens made of ultra-high strength steel.
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Received: 18 May 1985
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1 Hirth,J.P.,Metall.Trans.,12A(1981) ,861．
2 Li,J.C.M.;Oriani,R.A.;Darken,L.S.,Z.Phys.Chem.,Neue Folge,49(1966) ,271．
3 Van Leeuwen,H.P.,A Quantitative Analysis of Hydrogen-Induced Cracking,National Technical Information Service,N77-25307,1976．
4 Oriani,R.A.;Josephic,P.H.,Acta Metall.,25(1977) ,979．
5 褚武扬;李世琼;肖纪美,金属学报,17(1982) ,10．
6 Chu Y.W.(褚武扬);Li S.Q.(李世琼);Hsiao C.M.(肖纪美);Ju S.Y.(朱淑彦),Corrosion,37(1981) ,514．
7 John,C.S.T.;Gerberich,W.W.,Metall.Trans.,4(1973) ,589．
8 Chu W.Y.(褚武扬);Hsiao C.M.(肖纪美);Ju S.Y.(朱淑彦);Wang C.(王枨),Corrosion,38(1982) ,446．
9 褚武扬;肖纪美;王枨;朱淑彦,金属学报,18(1982) ,515．
10 Chu W.Y.(褚武扬);Zhang T.Y.(张统一);Hsiao C.M.(肖纪美),Corrosion,40(1984) ,197．
11 Bockris,J.O'M.;Beck,W.;Genshan,M.A.;Subramanyan,P.K.;Williams,F.S.,Acta Metall,19(1971) ,1209．
12 Li,J.C.M.,Metall.Trans.,9A(1978) ,1351．
13 Bockris,J.O'M;Subramanyan,P.K.,Acta Metall.,19(1971) ,1205．
14 Hirth,J.P,Stress Corrosion Cracking and Hydrogen Embrittlement of Iron Base Alloy,Eds.Staehle,R.W.,et al,NACE,Houston,1977,p.1． |
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