# # Fitted Curve! Note!!: Specimen has Carburized Case. # Do not use for prediction. # Check original data file. Flat Fatigue limit not found yet. # Carburized SAE4320 Core and Case of 0.04inch dept HRc=57 max, Core HRc=44 # (Spec. diameter=0.20inch) Martensite. # Original material: ElecFurn., LadleRef. IngotCast(711x711mmBloom) # HotRolled to 25.4mm Bar, Then machined. Then carburized. # Inclusions: TypeA=2 to 2.5Thin, TypeB,C,D=none, # Test: UoToledo, F.Yin, A.Fatemi, Oct.2003. # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4320 #Name= AisiIt_63 #Name= Case+Core #Stress_units= MPa #Strain_units= strain #Sy= 1344.5 #Su= 1705.3 #E= 203100 (average of 12), # Reported was = 201000 #monotonic_K= 2343.8 #monotonic_n= 0.084 #FractureStrain= 0.811 #FractureStress= 2198. #%RA= 55.5 #MaterialForm= bar #FailureDef= 50% load drop #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= True #Ingot Cast= True #Continuous Cast= False #ASTM Grain Size No. (Min to Max)= 2 to 3 #Carbon, %= 0.2 #Manganese, %= 0.55 #Phosphorus, %= 0.009 #Sulfur, %= 0.015 #Silicon, %= 0.25 #Copper, %= 0.22 #Nickel, %= 1.68 #Chromium, %= 0.51 #Molybdenum, %= 0.23 #Vanadium, %= 0.00 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.039 #Lead, %= 0.000 #Titanium, %= 0.003 #Calcium, %= 0.00 #Cobalt, %= 0.010 #Zirconium, %= 0.000 #Boron, %= 0.0004 #Tin, %= 0.010 #Oxygen, ppm= 10 #Nitrogen, ppm= 87 # SAE4320 AisiIt_63 BHN= **** Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29457. KSI, 203. GPA K' = 340.8 KSI, 2350.MPA #YIELD,0.2%= 195. KSI, 1345. MPA N' = 0.0988 #ULT. STRG.= 247. KSI, 1705. MPA F. STRG COEF= 333.8 KSI, 2302.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0742 #N = 0.0000 FAT DUCT COEF= 0.8121 #RED. IN AREA = 55.5 F.DUCT EXP, c=-0.7511 #T. FRAC. STG.= 318.8 KSI, 2198. MPA Exp Cyc Yld = 184. Ksi,1271.MPA #T. FRAC. STR.= 0.811 Fit Cyc Yld = 183. Ksi,1261.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!! Short life and Fatigue limit fitted manually. FAC July2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .811 1 2198. 0 .80 203100. #Fitted_point manually 0.02283 200 1535.4 0. 0.01527 203100. #Fitted_point 0.01477 500 1436.8 0. 0.00770 203100. #Fitted_point 0.01132 1000 1366.6 0. 0.00459 203100. #Fitted_point 0.00914 2000 1299.9 0. 0.00274 203100. #Fitted_point 0.00738 5000 1216.7 0. 0.00138 203100. #Fitted_point 0.00652 10000 1157.3 0. 0.00083 203100. #Fitted_point 0.00591 20000 1100.6 0. 0.00049 203100. #Fitted_point 0.00532 50000 1029.5 0. 0.00025 203100. #Fitted_point 0.00496 100000 978.4 0. 0.00015 203100. #Fitted_point 0.00466 200000 929.7 0. 0.00009 203100. #Fitted_point 0.00432 500000 868.8 0. 0.00004 203100. #Fitted_point 0.00409 1000000 825.3 0. 0.00003 203100. #Fitted_point 0.00387 2000000 783.9 0. 0.00001 203100. #Fitted_point 0.00361 5000000 732.4 0. 0.00001 203100. #Fitted_point .0035 8000000 719 0. .0 203100. #Fitted_point manually .0035 10000000 719 0. .0 203100. #Fitted_point manually #