# # Fitted Curve ! # SAE 9254 Modified: extra Vanadium, Q+T HRc=54 # Material cyclically softens substantially. # Basic Oxygen, Concast, HotRolled 25mm bar, Spec. machined # then heat treated: held 45min 1650F in nitrogen, Quenched in # 150F Oil, Tempered 45min at 770F, then water quenched, Rc=51-55 # Final polish before testing. # Inclusions: TypeABC=not obsv., TypeD=1.5 # Test: UoWaterloo, M.Khalil and T.Topper May2000 # saedigcurve_v2.2.f starts. #FileType= strain_life #DataType= fitted #Name= SAE9254V #name= +V_modified #Name= AisiIt_34 #Stress_units= MPa #Strain_units= strain #Sy= 1870.0 #Su= 2050.0 #E= 220000 (estimated from long life) Original report=206000 too low. FAC #It is not clear if this E change is caused by cyclic deformation #or some experimental feature. #monotonic_K= 2413.0 #monotonic_n= 0.042 #FractureStrain= 0.436 #FractureStress= 2495. #%RA= 35.1 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 536 #Hardness, Rockwell C= 54 #Basic Oxygen= True #Electric Furnace= False #Vacuum Degas= False #Ladle Refined= False #Ingot Cast= False #Continuous Cast= True #Martensite, %= 100 #Carbon, %= 0.52 #Manganese, %= 0.45 #Phosphorus, %= 0.011 #Sulfur, %= 0.011 #Silicon, %= 1.49 #Copper, %= 0.01 #Nickel, %= 0.01 #Chromium, %= 0.72 #Molybdenum, %= 0.09 #Vanadium, %= 0.19 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.024 #Nitrogen, ppm= 100 # SAE9254V AisiIt_34 BHN= 536 Fn= 0 # Monotonic Props. Cyclic Props. #ELAS. MOD.= 31908. KSI, 220. GPA K' = 489.5 KSI, 3375.MPA #YIELD,0.2%= 271. KSI, 1870. MPA N' = 0.1312 #ULT. STRG.= 297. KSI, 2050. MPA F. STRG COEF= 589.7 KSI, 4066.MPA #K = 0.0 KSI, 0. MPA F.STRG EXP, b=-0.1213 #N = 0.0000 FAT DUCT COEF= 4.1383 #RED. IN AREA = 35.1 F.DUCT EXP, c=-0.9251 #T. FRAC. STG.= 361.9 KSI, 2495. MPA Exp Cyc Yld = 217. Ksi,1494.MPA #T. FRAC. STR.= 0.436 Fit Cyc Yld = 212. Ksi,1461.MPA #No. fatigue data points= 27 # # NOTE!! The Following Points are <b>FITTED DATA:</b>#NOTE!! Fitted Stress computed using Experm. K' and n' # NOTE!! Short life adjusted, Fatigue limit inserted manually. FAC Aug2009 #Stress_Units= MPa # Total Strain 2Nf Stress Mean Plastic Strain Initial # Amp Amp Stress Amp Elastic Mod. .9 1 2500. 0. .89 220000. #Fitted_point manually 0.01101 2000 1530.1 0. 0.00405 220000. #Fitted_point 0.00814 5000 1439.3 0. 0.00160 220000. #Fitted_point 0.00687 10000 1360.9 0. 0.00068 220000. #Fitted_point 0.00599 20000 1267.3 0. 0.00023 220000. #Fitted_point 0.00516 50000 1126.4 0. 0.00004 220000. #Fitted_point 0.00467 100000 1025.2 0. 0.00001 220000. #Fitted_point 0.00425 200000 935.4 0. 0.00000 220000. #Fitted_point 0.00378 500000 832.1 0. 0.00000 220000. #Fitted_point 0.00347 1000000 763.1 0. 0.00000 220000. #Fitted_point 0.00347 10000000 763.1 0. 0.00000 220000. #Fitted_point manually #