# # Fitted Curve. # SAE4140 HRc=42 Q+T, Source: ConCast ColdSized 32mm bar,Elec. Furnace # Inclusions: TypeD(globular)= 1.5, 100% Martensite. # Test: UWaterloo # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE4140 #Name= AisiIt_66 #Stress_units= MPa #Strain_units= strain #Sy= 1330.0 #Su= 1537.0 #E= 204000 #monotonic_K= 2188.0 #monotonic_n= 0.080 #FractureStrain= .60 #FractureStress= 1705. #%RA= 42.1 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 42 #BHN= 390 #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.42 #Manganese, %= 0.83 #Phosphorus, %= 0.011 #Sulfur, %= 0.021 #Silicon, %= 0.24 #Copper, %= 0.13 #Nickel, %= 0.25 #Chromium, %= 0.88 #Molybdenum, %= 0.19 #Vanadium, %= 0.00 #Columbium/Niobium, %= 0.01 #Aluminum, %= 0.024 #Calcium, %= 0.00 #Tin, %= 0.010 #Nitrogen, ppm= 90 # SAE4140 AisiIt_66 BHN= 390 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29588. KSI, 204. GPA K' = 212.5 KSI, 1465.MPA #YIELD,0.2%= 193. KSI, 1330. MPA N' = 0.0769 #ULT. STRG.= 223. KSI, 1537. MPA F. STRG COEF= 208.5 KSI, 1438.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0511 #N = 0.0000 FAT DUCT COEF= 0.7829 #RED. IN AREA = 42.1 F.DUCT EXP, c=-0.6640 #T. FRAC. STG.= 247.3 KSI, 1705. MPA Exp Cyc Yld = 132. Ksi, 908.MPA #T. FRAC. STR.= 0.600 Fit Cyc Yld = 130. Ksi, 895.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!! Manual fit near Nf=1 and fatigue limit. FAC Jun09 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .60 1 1705 0. 0.592 204000. #Fitted_point manually 0.00981 2000 974.4 0. 0.00504 204000. #Fitted_point 0.00730 5000 922.3 0. 0.00278 204000. #Fitted_point 0.00613 10000 885.5 0. 0.00179 204000. #Fitted_point 0.00534 20000 851.2 0. 0.00117 204000. #Fitted_point 0.00465 50000 809.6 0. 0.00068 204000. #Fitted_point 0.00429 100000 780.9 0. 0.00046 204000. #Fitted_point 0.00401 200000 754.3 0. 0.00032 204000. #Fitted_point 0.00373 500000 721.6 0. 0.00020 204000. #Fitted_point 0.00356 1000000 698.3 0. 0.00014 204000. #Fitted_point 0.0035 2000000 692 0.0 0.00000 204000 #Fitted_point manually 0.0035 10000000 692 0.0 0.00000 204000 #Fitted_point manually #