# # Fitted Curve ! # SAE4320+Carburized HRc=59 # ElecFurnace, ConCast(270x375mm), HotRolled to 47.6mmBar, # Rough machined, ThruCarburized, final grind +polished 100%Martensite # ASTM GrainSize 4to5, Inclusions: TypeA=2 to 2.5Thin, TypeB,C,D=none # Test: UoToledo, F.Yin, A.Fatemi, March 2002 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4620 #Name= AisiIt_48 #Name= Carburized #Stress_units= MPa #Strain_units= strain #Sy= 1316.6 #Su= 2226.9 #E= 207500 (avg. of 11) original reported as 216000 #monotonic_K= 5049.0 #monotonic_n= 0.206 #FractureStrain= 0.019 #FractureStress= 2227 (assume same as ultimate) #%RA= 4 (average of 3) #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 59 #BHN= 634 (from tables) #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #ASTM Grain Size No. (Min to Max)= 4 to 5 #Carbon, %= 0.2 #Manganese, %= 0.58 #Phosphorus, %= 0.01 #Sulfur, %= 0.016 #Silicon, %= 0.21 #Copper, %= 0.16 #Nickel, %= 1.7 #Chromium, %= 0.15 #Molybdenum, %= 0.26 #Vanadium, %= 0.00 # SAE4620 AisiIt_48 BHN= 634 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 30095. KSI, 208. GPA K' = 850.0 KSI, 5860.MPA #YIELD,0.2%= 191. KSI, 1317. MPA N' = 0.2026 #ULT. STRG.= 323. KSI, 2227. MPA F. STRG COEF= 429.2 KSI, 2959.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0905 #N = 0.0000 FAT DUCT COEF= 0.0343 #RED. IN AREA = 4.0 F.DUCT EXP, c=-0.4469 #T. FRAC. STG.= 323.0 KSI, 2227. MPA Exp Cyc Yld = 241. Ksi,1664.MPA #T. FRAC. STR.= 0.019 Fit Cyc Yld = 256. Ksi,1763.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!! Fitted short life and fatigue limit manually. FAC July09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .019 1 2227 0. .0082 207500. #Fitted_point manually 0.01598 50 2145.7 0. 0.00564 207500. #Fitted_point 0.01378 100 2016.5 0. 0.00406 207500. #Fitted_point 0.01204 200 1893.7 0. 0.00292 207500. #Fitted_point 0.01026 500 1740.8 0. 0.00187 207500. #Fitted_point 0.00920 1000 1632.2 0. 0.00133 207500. #Fitted_point 0.00831 2000 1529.5 0. 0.00094 207500. #Fitted_point 0.00736 5000 1402.8 0. 0.00060 207500. #Fitted_point 0.00675 10000 1313.7 0. 0.00042 207500. #Fitted_point 0.00623 20000 1230.2 0. 0.00030 207500. #Fitted_point 0.00563 50000 1128.2 0. 0.00019 207500. #Fitted_point 0.00523 100000 1057.0 0. 0.00013 207500. #Fitted_point 0.00487 200000 990.6 0. 0.00010 207500. #Fitted_point 0.00444 500000 909.5 0. 0.00006 207500. #Fitted_point 0.00415 1000000 852.9 0. 0.00004 207500. #Fitted_point 0.00389 2000000 800.0 0. 0.00003 207500. #Fitted_point 0.00356 5000000 735.3 0. 0.00002 207500. #Fitted_point 0.00356 10000000 735.3 0. 0.00002 207500. #Fitted_point manually #