# # Fitted Curve! # SAE86B20 Thru Carburized Simulated Case Rc=63 100%Martensite # Material cyclically hardens substantially. # ElecFurnace, ConCast(184.2mm Billet), HotRolled to 53.2mm bar, Spec. machined # polished and then thru Carburized in atmosphere, then tested. # Inclusions: TypeA=1.5Thin, TypeBC=0, TypeD=1.5Thin # ASTM GrainSize: T-T 5 to 6, L-T=5 to 6, # Test: UoToledo, H.Zhang and A.Fatemi Apr.2005 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE86B20 #Name= AisiIt_75 #Stress_units= MPa #Strain_units= strain #Sy= 1114.9 #Su= 1309.4 #E= 201100 average of 10 obsv. Initially reported= 200000 #monotonic_K= 6985.0 #monotonic_n= 0.293 #FractureStrain= 0.01 #FractureStress= 1312. #%RA= 0.3 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 507.6 #Hardness, Rockwell C= 63 at surface, Rc=55 at center #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.19 #Manganese, %= 0.9 #Phosphorus, %= 0.018 #Sulfur, %= 0.029 #Silicon, %= 0.24 #Copper, %= 0.24 #Nickel, %= 0.36 #Chromium, %= 0.58 #Molybdenum, %= 0.2 #Aluminum, %= 0.021 #Titanium, %= 0.034 #Calcium, %= 0.00 #Boron, %= 0.002 #Oxygen, ppm= 12 #Nitrogen, ppm= 65 # SAE86B20 AisiIt_75 BHN= 507 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 29167. KSI, 201. GPA K' = 983.2 KSI, 6779.MPA #YIELD,0.2%= 162. KSI, 1115. MPA N' = 0.1901 #ULT. STRG.= 190. KSI, 1309. MPA F. STRG COEF= 323.4 KSI, 2230.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0975 #N = 0.0000 FAT DUCT COEF= 0.0029 #RED. IN AREA = 0.3 F.DUCT EXP, c=-0.5127 #T. FRAC. STG.= 190.3 KSI, 1312. MPA Exp Cyc Yld = 302. Ksi,2080.MPA #T. FRAC. STR.= 0.010 Fit Cyc Yld = 276. Ksi,1904.MPA #No. fatigue data points= 14 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Curve adjusted manually at cycle_1 and fatigue limit. fac Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.013 1 1770. 0. 0.00367 201100. #Fitted_point manually 0.00975 10 1745.4 0. 0.00107 201100. #Fitted_point 0.00890 20 1648.4 0. 0.00070 201100. #Fitted_point 0.00796 50 1521.6 0. 0.00040 201100. #Fitted_point 0.00735 100 1428.0 0. 0.00025 201100. #Fitted_point 0.00681 200 1337.6 0. 0.00016 201100. #Fitted_point 0.00617 500 1224.3 0. 0.00008 201100. #Fitted_point 0.00574 1000 1144.0 0. 0.00005 201100. #Fitted_point 0.00534 2000 1068.7 0. 0.00003 201100. #Fitted_point 0.00487 5000 976.4 0. 0.00002 201100. #Fitted_point 0.00454 10000 911.9 0. 0.00001 201100. #Fitted_point 0.00424 20000 851.8 0. 0.00001 201100. #Fitted_point 0.00387 50000 778.4 0. 0.00000 201100. #Fitted_point 0.00362 100000 727.2 0. 0.00000 201100. #Fitted_point 0.00338 200000 679.5 0. 0.00000 201100. #Fitted_point 0.00309 500000 621.2 0. 0.00000 201100. #Fitted_point 0.00309 10000000 621.2 0. 0.00000 201100. #Fitted_point manually #