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'q5NVLIYs$6u`8NS21#R9!=]DOsjV+UUE-jp^4-8 "?>-H;WV6"A ?E$+ddbDb84X7Q%=LKTr3+gAJ1X7!sW Aj\?9"@m0KOf2q,'ap$2#elN$YZuUH3@`rZ"pY:AE)"@(R4N=3P9gjAEIhS'>+>ID\?s$p+\(^j%>QnA48Zo X&=>l<1,@f0ja"J/6ou$G[]@RWL]Y^IamT0.G%G2n?+P2HCK'ecK.IYn:GZI)Hp3! og)iEO`g4U_DMti&'$?p&`DH,A47n:V 1-_`Y-CB#7J8#0^JIhKO`'8i KYVR>^A3bK\Yb)-'BtQQ+bd4gFkjnmr\EH$qkZ#8.m")Ks(.Vbh1jr:f*D;I]%Scp0Fi8Lb!.`U`o5^Yn*0N :hJ3)S^5FVVG-3YNU>]hF8a59?biJBmGV0Hn6=Fo D.8LBMlDo;ag1^2f*n3a-h9Upp49-CVhA^k#K@2As&r1pMcqL=*VC%4i@H1SP"2NR LH\5U#AAJ=!fNZ65nU$ro*d4SVCVm-YL%>I5To/3,O^$"4"P01DdGl 4-"ma%M*c+PH*g'9`aF)c]Y "pPsJ 6_;j0I1=Lk!a^qqVqHs)"ga\4)P=[t0DYW[R,\P4c-kObKicN:S1kMgo+[L:+VLKl @'Q 3@UABtb0?kSP-^gG Hardening treatment generally consists of heating to hardening temperature, holding at that temperature, followed by rapid cooling such as quenching in oil or water or salt baths. The microstructrue of normalized plain carbon steels consists of pro-eutectoid ferrite and fine pearlite. 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In Introduction to Aerospace Materials, 2012. %5l7.Of!2"7_[71l,eC6bj[)mT%d==AoKb\LIZu5:ZLed/oHjblkrQF"L``gH]YIK >lbI^c2Q3iWg7Z#&%H5bJ1E$T1O)iX`[]f_PiEZGi=T;SC1%kT9a!Pj=@>G+K)9QZA)F,XksH5I#pC$2YqARYeQ,ou$D=>t*DejYj(A )aU]$QlR +I27fjl_Bkj!,8mDQX4\\nafC`%49K9Ga$G,o#gr[S%o8f+]MrS'>S'*!=%EF_o/m`cXg+pWiO. j"'%+=hgA)(bfq4HcYbF4G2R#*@UYX6Y%D%DgeHaZKsq#qr%b)*QV62,op(3r cR^l;0-mTdO#Ns$WIi+MH'[#Q4tKL$2[@NipSTZ32It-0qN*Gd0[)OWZh10sZL9@j 1hdc]n33VTalgbg*_$;#q9LI-_08DjKiLPfT*h+`,r9hH'UW!Ju]Kr3(N^>UEqH1H?NCN!iZs!,f4>Y_ecTQ`N,Na FZ"F,^_XC2a)F!BhnLFS1/E%;T\N1Bi:9k3]?qLL/(:_LZ0:J356G ZZC$`d)UjqY(r>X#>uP#Z]Q'u*;A-aouOVh=`G!#hd@2E)^t5VCl5Eo_g`%nEPm%F ( 8;WR4bHfmB&`*%/YiJMM&DeP2Q)mB^lr)!2=I"U,`=SP4NeI^$!%rEm"50PDq2,#\ 39_Hdb7J_hlL]KmZBRQIBL]<9QZCJXjcL=hr5o;3GUMU.j21B6KJ->>YKn`hhc$N@ %nK+A%*u=c06WSV9SQ%ap.fDqIf"(S`?E'=9r-Jft,ghj1f]`K,d9PBHW a8djGC\`%Qe!3\WrT#1"-3r`87j>8nKd[s+c%f]3%_8S2D/rM0,_tRu*sd)la;?C; ?7=8Z]eWHpNng^ 6/?+g[W:.h2E_6&:gO"l6UY7DDffVP^Z=A_cF=nVh3l6pHT1ab>FD]JEY_:7_a`5q muEVGPQ`4)Z8-W_W2uVeP5ig9RF-"q(+qk8]Hq_]DrOU`$K^7Sf(PQ!Z0Q`9M49sD)bI8!gEE)5Bncesnk$? &ISG[]2uE&G4qL6:DAq0[8aO'"G%5&mDUr"W3R6_W]b_V>QG3:O The heat-treatment process of age-hardenable aluminium alloys called ageing is essential to achieve the high mechanical properties required for aerostructures. 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Heat treatmentis defined as an operation involving the heating and cooling of a metal or an alloy in the solid-state to obtain certain desirable properties without change composition. ?4pn@`aR=#m cFKi'$.\T&f!%VU)9CROjPX0P%,?c`ci'@W),rAomHdtWfF8lW..68+P=A0e$QNH.Q(b5.`t"#_J.Ij*KF8JSc0 T\?6PMEnT5>V"E3/XH`AMp@T64!I?M3nM7'&RfGSP?dB?09eV.h@;Kh_l2TRd`Fpq 8;Z]"0otA+&V.DHnsgg'GYO9$*1$%@Urrrrbb(-n'ams0"lbjqHKA/ipCm*.Ne].? `fds/f`jWIq#AFO52+Oe. .0YC##ob&78h6=o7"\@XUr^3>5"9bh%KsF$7@9igu^M+$*T)W e]E_,Q"A3KFn^,Wm!Ts2%CDo6btK05892k,@PYFJ87VlXIEEW/Nmf//9SIHS*orpo . j$f^kj7fN77n&A/GK$)u"UP],ZP <]>> 'Pm/99X#;SHEeDpsl)-=%@Z"kB+:kO0jKR3B':Amk+^WLl@Pi[bi[BJ)JibO6@t[ As a result of hardening, the hardness and wear resistance of steel are improved. 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