# # Fitted Curve ! # SAE86B20 Simulated Carburized Core. Rc=43 100%Martensite # Material cyclically softens somewhat. # ElecFurnace, ConCast(184.2mm billet), HotRolled to 53.2mm bar. Spec. machined # then heated in vacuum to 1800F then Quenched +tempered # ASTM GrainSize T-T=11to 12, L-T= 10 to 11 # Inclusions: TypeA=2.5Thin, TypeBC=0 TypeD=1.5thin # Test: UoToledo, N.Cyril and A.Fatemi June2006 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE86B20 #Name= SimulatedCore #Name= AisiIt_82 #Stress_units= MPa #Strain_units= strain #Sy= 1198.0 #Su= 1502.0 #E= 208600 avg. or 13 obsv. Initially reported 205900. #monotonic_K= 2192.8 #monotonic_n= 0.092 #FractureStrain= .909 #FractureStress= 3000 guestimated. Reported value of 968. seems too low. #%RA= 59.7 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 43 #BHN= 401 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.19 #Manganese, %= 0.9 #Phosphorus, %= 0.018 #Sulfur, %= 0.029 #Silicon, %= 0.24 #Copper, %= 0.24 #Nickel, %= 0.36 #Chromium, %= 0.58 #Molybdenum, %= 0.2 #Aluminum, %= 0.021 #Titanium, %= 0.034 #Calcium, %= 0.00 #Boron, %= 0.002 #Tin, %= 0.010 #Oxygen, ppm= 12 #Nitrogen, ppm= 65 # SAE86B20 SimulatedC BHN= 401 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 30255. KSI, 209. GPA K' = 334.8 KSI, 2308.MPA #YIELD,0.2%= 174. KSI, 1198. MPA N' = 0.1213 #ULT. STRG.= 218. KSI, 1502. MPA F. STRG COEF= 393.6 KSI, 2714.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.1114 #N = 0.0000 FAT DUCT COEF= 3.7970 #RED. IN AREA = 59.7 F.DUCT EXP, c=-0.9190 #T. FRAC. STG.= 140.4 KSI, 968. MPA Exp Cyc Yld = 158. Ksi,1086.MPA #T. FRAC. STR.= 0.909 Fit Cyc Yld = 159. Ksi,1096.MPA #No. fatigue data points= 16 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Short life and fatigue limit manually fitted. fac Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .909 1 3000. 0. .895 208600. #Fitted_point manually 0.01907 500 1296.9 0. 0.01285 208600. #Fitted_point 0.01267 1000 1224.2 0. 0.00680 208600. #Fitted_point 0.00909 2000 1154.4 0. 0.00356 208600. #Fitted_point 0.00655 5000 1064.1 0. 0.00145 208600. #Fitted_point 0.00546 10000 995.1 0. 0.00069 208600. #Fitted_point 0.00474 20000 924.4 0. 0.00031 208600. #Fitted_point 0.00408 50000 831.0 0. 0.00009 208600. #Fitted_point 0.00370 100000 764.5 0. 0.00004 208600. #Fitted_point 0.00339 200000 703.8 0. 0.00002 208600. #Fitted_point 0.00304 500000 632.3 0. 0.00000 208600. #Fitted_point 0.00280 1000000 584.0 0. 0.00000 208600. #Fitted_point 0.00250 2000000 521. 0. 0.00000 208600. #Fitted_point manually 0.00225 5000000 469. 0. 0.00000 208600. #Fitted_point manually 0.00225 10000000 469. 0. 0.00000 208600. #Fitted_point manually #