# # Fitted Curve ! # SAE8620 Q+T HRc=45 Typical Core condition of carburized part # BasicOxygen, LadleRefined, ConCast(381x508mm) HotRolled to 82.8mm Bar # Specimens machined, copper plated to prevent carbon intrusion then # placed in Carburizing furnace. Thus simulating core properties. # 100% Martensite, Inclusions TypeD= 3Heavy, TypeA,B,C= not reported. # Chem before Carb.: 0.23C .82Mn .011P .027S .25si .02C .48Ni .5Cr # .18Mo .01V .003Ti # Test: UoWaterloo, M.Khalil and T.Topper Oct.2000 #FileType= strain_life #DataType= fitted #Name= SAE8620_Rc=45 #Name= AisiIt_39 #Stress_units= MPa #Strain_units= strain #Sy= 1420.0 #Su= 1683.0 #E= 180000 #monotonic_K= 1876.0 #monotonic_n= 0.040 #FractureStrain= 0.781 #FractureStress= 2601. #%RA= 36.2 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 430 #Hardness, Rockwell C= 45 #Basic Oxygen= True #Ladle Refined= True #Continuous Cast= True #Martensite, %= 100 # #saedigcurve_v2.2.f starts. #NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' #NOTE!! Adjusted short life and fatigue limit manually. FAC Aug.2009 #Stress_Units= MPa #Total Strain 2Nf Stress Mean Plastic Strain Initial ## Amp Amp Stress Amp Elastic Mod. .781 1 2601. 0. .767 180000. #Fitted_point manually 0.01181 2000 1395.9 0. 0.00406 180000. #Fitted_point 0.00788 6500 1267.3 0. 0.00084 180000. #Fitted_point manually 0.00640 13300 1129.3 0. 0.00013 180000. #Fitted_point manually 0.00540 22000 970.1 0. 0.00001 180000. #Fitted_point manually 0.00441 46000 794.5 0. 0.00000 180000. #Fitted_point manually 0.00382 80000 686.9 0. 0.00000 180000. #Fitted_point manually 0.00331 150000 595.1 0. 0.00000 180000. #Fitted_point manually 0.00274 500000 493.0 0. 0.00000 180000. #Fitted_point manually .00274 10000000 493.0 0. 0.00000 180000. #Fitted_point manually # #