# # Fitted Curve. Beware of using this file. Compare to others. # SAE4140 Rc=42.5, ElecFurnace Concast,Normalized 1650F,Forged Reduc 83% # Quenched from 1550 into 150F oil, temp. 750F, 100%Martensite, # Inclusions: typeA(Sulf)3.5T 1.0H, TypeD(glob) 1T 0.fH # Test: UoToledo # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4140 #Name= AisiIt_81 #Stress_units= MPa #Strain_units= strain #Sy= 1263.2 #Su= 1299.3 #E= 204500 #monotonic_K= 1533.8 #monotonic_n= 0.030 #FractureStrain= 0.13 #FractureStress= 1284 #%RA= 1.3 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 395 #Hardness, Rockwell C= 42.5 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.4 #Manganese, %= 0.85 #Phosphorus, %= 0.013 #Sulfur, %= 0.077 #Silicon, %= 0.28 #Copper, %= 0.23 #Nickel, %= 0.15 #Chromium, %= 0.99 #Molybdenum, %= 0.21 #Aluminum, %= 0.010 #Tin, %= 0.009 #Nitrogen, ppm= 94 # SAE4140 AisiIt_81 BHN= 395 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29660. KSI, 205. GPA K' = 454.2 KSI, 3131.MPA #YIELD,0.2%= 183. KSI, 1263. MPA N' = 0.1605 #ULT. STRG.= 188. KSI, 1299. MPA F. STRG COEF= 258.2 KSI, 1780.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0979 #N = 0.0000 FAT DUCT COEF= 0.0296 #RED. IN AREA = 1.3 F.DUCT EXP, c=-0.6100 #T. FRAC. STG.= 186.2 KSI, 1284. MPA Exp Cyc Yld = 167. Ksi,1155.MPA #T. FRAC. STR.= 0.130 Fit Cyc Yld = 162. Ksi,1119.MPA #No. fatigue data points= 18 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # Note!! AutoFit not optimal.Curve fitted manually. FAC Jun09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .013 1 1284. 0. .007 204500. #Fitted_point manually 0.0100 24 1220 -40.9 0.00404 204000 #IGL 0.0065 380 1045 -26.3 0.00139 211000 #IGL 0.0050 1408 985 -6.7 0.00018 208000 #IGL 0.00377 10000 748.4 0. 0.00011 204500. #Fitted_point 0.0028 85000 569 0.0 0.00000 0000 #IGL 0.0023 272978 465 0.0 0.00000 0000 #None ??? 0.0023 10000000 465 0.0 0.00000 0000 #Runout #