# # Fitted Curve ! # SAE8822 simulated Carburized Core 100%Martensite HRc=39 # Chemical composition is "high side" # Material cyclically softens substantially. See curves. # ElecFurnace, VacuumDegas, LadleRefined, Concast_177mmBillet # HotRolled to 34mm bar. # Process:High Side Composition Quenched and Tempered Simulated # Carburized Core (Atmosphere) # Test: UoWaterloo, M.El-Zeghayar and T.Topper Apr2008 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE8822 #Name= AisiIt_108 #Stress_units= MPa #Strain_units= strain #Sy= 1135.0 #Su= 1215.0 #E= 194000 #monotonic_K= 1430.0 #monotonic_n= 0.037 #FractureStrain= 0.903 #FractureStress= 2690. #%RA= 59.4 #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 39 #Bhn= 362 #converted #StrAmp 2Nf StsAmp So CalcPlasStr InitialModulus #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= True #Ladle Refined= True #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.22 #Manganese, %= 0.86 #Phosphorus, %= 0.013 #Sulfur, %= 0.025 #Silicon, %= 0.17 #Copper, %= 0.24 #Nickel, %= 0.43 #Chromium, %= 0.54 #Molybdenum, %= 0.39 #Vanadium, %= 0.00 #Aluminum, %= 0.028 #Tin, %= 0.010 # SAE8822 AisiIt_108 BHN= 362 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 28137. KSI, 194. GPA K' = 183.9 KSI, 1268.MPA #YIELD,0.2%= 165. KSI, 1135. MPA N' = 0.0743 #ULT. STRG.= 176. KSI, 1215. MPA F. STRG COEF= 166.1 KSI, 1145.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.0395 #N = 0.0000 FAT DUCT COEF= 0.2542 #RED. IN AREA = 59.4 F.DUCT EXP, c=-0.5311 #T. FRAC. STG.= 390.2 KSI, 2690. MPA Exp Cyc Yld = 116. Ksi, 799.MPA #T. FRAC. STR.= 0.903 Fit Cyc Yld = 116. Ksi, 797.MPA #No. fatigue data points= 18 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. 0.26006 1 1115.9 0. 0.25431 194000. #Fitted_point 0.01098 1000 864.8 0. 0.00652 194000. #Fitted_point 0.00886 2000 843.0 0. 0.00451 194000. #Fitted_point 0.00697 5000 814.9 0. 0.00277 194000. #Fitted_point 0.00601 10000 794.2 0. 0.00192 194000. #Fitted_point 0.00531 20000 774.0 0. 0.00132 194000. #Fitted_point 0.00466 50000 747.8 0. 0.00081 194000. #Fitted_point 0.00431 100000 728.4 0. 0.00055 194000. #Fitted_point 0.00403 200000 709.3 0. 0.00038 194000. #Fitted_point 0.00375 500000 684.5 0. 0.00023 194000. #Fitted_point 0.00359 1000000 666.1 0. 0.00015 194000. #Fitted_point 0.00344 2000000 648.0 0. 0.00010 194000. #Fitted_point 0.00328 5000000 624.6 0. 0.00006 194000. #Fitted_point 0.00317 10000000 607.5 0. 0.00004 194000. #Fitted_point 0.00307 20000000 590.8 0. 0.00003 194000. #Fitted_point 0.00295 50000000 569.5 0. 0.00002 194000. #Fitted_point 0.00287 100000000 554.0 0. 0.00001 194000. #Fitted_point 0.00278 200000000 538.9 0. 0.00001 194000. #Fitted_point 0.00268 500000000 519.6 0. 0.00000 194000. #Fitted_point 0.00261 1000000000 505.5 0. 0.00000 194000. #Fitted_point #