# # Fitted Curve ! # SAE51B60 Q+T Rc=45 # Material cyclically softens from Sy=1830 to Cyclic_Sy=1280. # ElecFurnace, ConCast(152x152mm), HotRolled to 82.3mm # Spec machined, then heat treated (Q in oil), tempered, polished. # Inclusions: TypeA,B,C none, TypeD= 1 # Typical part= springs, 100% Martensite # Test: UoWaterloo M.Khalil, T.Topper Revised Feb.2000 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE51B60 #Name= AisiIt_33 #Stress_units= MPa #Strain_units= strain #Sy= 1830.0 #Su= 1970.0 #E= 200000 #monotonic_K= 2332.0 #monotonic_n= 0.039 #FractureStrain= 0.20 #FractureStress= 1968. #%RA= 21.6 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 450 #Hardness, Rockwell C= 45 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.59 #Manganese, %= 0.86 #Phosphorus, %= 0.008 #Sulfur, %= 0.013 #Silicon, %= 0.26 #Copper, %= 0.10 #Nickel, %= 0.07 #Chromium, %= 0.81 #Molybdenum, %= 0.04 #Vanadium, %= 0.01 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.027 #Lead, %= 0.000 #Titanium, %= 0.041 #Cobalt, %= 0.010 #Boron, %= 0.0021 # SAE51B60 AisiIt_33 BHN= 450 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29008. KSI, 200. GPA K' = 433.4 KSI, 2988.MPA #YIELD,0.2%= 265. KSI, 1830. MPA N' = 0.1363 #ULT. STRG.= 286. KSI, 1970. MPA F. STRG COEF= 383.0 KSI, 2641.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0853 #N = 0.0000 FAT DUCT COEF= 0.4035 #RED. IN AREA = 21.6 F.DUCT EXP, c=-0.6258 #T. FRAC. STG.= 285.4 KSI, 1968. MPA Exp Cyc Yld = 186. Ksi,1281.MPA #T. FRAC. STR.= 0.200 Fit Cyc Yld = 185. Ksi,1273.MPA #No. fatigue data points= 20 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Adjusted fatigue limit manually. FAC Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.41666 1 2241.0 0. 0.40546 200000. #Fitted_point 0.01037 2000 1355.2 0. 0.00360 200000. #Fitted_point 0.00834 5000 1271.8 0. 0.00198 200000. #Fitted_point 0.00729 10000 1209.7 0. 0.00124 200000. #Fitted_point 0.00649 20000 1147.8 0. 0.00076 200000. #Fitted_point 0.00571 50000 1066.3 0. 0.00038 200000. #Fitted_point 0.00525 100000 1005.6 0. 0.00022 200000. #Fitted_point 0.00486 200000 946.6 0. 0.00012 200000. #Fitted_point 0.00442 500000 872.7 0. 0.00006 200000. #Fitted_point 0.00414 1000000 820.6 0. 0.00003 200000. #Fitted_point 0.00388 2000000 771.7 0. 0.00002 200000. #Fitted_point .00388 10000000 771.7 0. 0.00002 200000. #Fitted_point manually #