# # Fitted Curve ! # SAE8620 Thru Carburized Rc=62 50%Bainite 50%Martensite # Material cyclically hardens to elastic conditions. # ElecFurnace, LadleRefined, ConCast(152x152mm) HotRolled to 29.7mm bar # Spec. machined from the cylindrical bars and case carburized reaustenitized # and isothermally transformed to achieve 50% martensite and 50% bainite. # Inclusions: TypeA=1.2T TypeB=0.5T 0.3H TypeC=0.2T TypeD=1.5T 0.5H # Test: UoW A.Rteil and T.Topper June2007 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE8620 #Name= AisiIt_89 #Stress_units= MPa #Strain_units= strain #Sy= 1114.0 #Su= 1497.0 #E= 206100 #monotonic_K= 7198.0 #monotonic_n= 0.300 #FractureStrain= 0.013 #FractureStress= 1497. #%RA= 0 measured #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 62 on surface, 55 in core #BHN= 688 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= True #Ingot Cast= False #Continuous Cast= True #Bainite, %= 50 #Martensite, %= 50 #Carbon, %= 0.21 #Manganese, %= 0.83 #Phosphorus, %= 0.009 #Sulfur, %= 0.032 #Silicon, %= 0.25 #Copper, %= 0.15 #Nickel, %= 0.46 #Chromium, %= 0.5 #Molybdenum, %= 0.2 #Vanadium, %= 0.00 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.024 #Lead, %= 0.001 #Titanium, %= 0.002 #Calcium, %= 0.00 #Cobalt, %= 0.006 #Zirconium, %= 0.001 #Boron, %= 0.0003 #Tin, %= 0.006 #Oxygen, ppm= 9 #Nitrogen, ppm= 63 # SAE8620 AisiIt_89 BHN= 688 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29892. KSI, 206. GPA K' = 0.0 KSI, 0.MPA #YIELD,0.2%= 162. KSI, 1114. MPA N' = 0.0000 #ULT. STRG.= 217. KSI, 1497. MPA F. STRG COEF= 333.2 KSI, 2297.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0853 #N = 0.0000 FAT DUCT COEF= 0.0000 #RED. IN AREA = 0.0 F.DUCT EXP, c= 0.0000 #T. FRAC. STG.= 217.1 KSI, 1497. MPA Exp Cyc Yld = 0. Ksi, 0.MPA #T. FRAC. STR.= 0.013 Fit Cyc Yld = 0. Ksi, 0.MPA #No. fatigue data points= 19 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! No plastic strain vs life data. Use elastic to fit. #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.01115 1 2298. 0. 0. 206100. #Fitted_point 0.00753 100 1551. 0. 0. 206100. #Fitted_point 0.00323 2000000 665.7 0. 0. 206100. #Fitted_point .00302 4000000 622.4 0. 0. 206100. #Fitted_point manually .00302 10000000 622.4 0. 0. 206100. #Fitted_point manually #