# AISI SAE4320 steel ThruCarburized (Vacuum) Simul.Carbur.Case HRc= 60 # 100% Matensite(?), 20.1% Retained Aust. # 0.7wt% Carbon on Surface, 0.50% at 0.15inch depth (Not really thru Carb.) # See R.Cryderman report 05-26-2017SEM-Analy167_168_170Cryderman.pdf # Constant Ampl. Tests, axial specimens # Avg Austenite Grain size 16.4 # Original Chem. Gerdau H-M53488: 0.18C .63Mn .013P .025S .21Si .22Cu # 1.75Ni .50Cr .25Mo .002V .004Co .026Al .00Ca .0004B .009Sn 82ppmN # Type A (sulfide) 1.3T 0.0H Type B (alumina) 0.0T 0.0H # Type C (silicate) 0.0T 0.0H Type D (globular) 1.0T 0.5H # Gerdau H-M53488 Elec Furn. VacDegas LadleRefined, ConCast 152x152mm Billet # Axial spec. from R34.9mm bar then heat treat # Tested by D.Gaia UWaterloo 2015 #FileType= strain_life #DataType= raw #Name= SAE4320 #Name= aisiIt-167 #Stress_units= MPa #Strain_units= strain #Sy= 783 #Su= 820. #eu= 0.0066 same as fracture strain #E= 205000. #TrueFractureStrain= 0.0066 #TrueFractureStress= 820 #%RA= 0.25 #%Elongation= 0.065 same as fracture strain #monotonic_K= 1492.0 #monotonic_n= 0.118 #MaterialForm= bar #FailureDef= 50% load drop #BHN= 653 #Hardness, Rockwell C= 60-63 #TotStrAmp 2Nf, StsAmpl So PlasStrAmp ElasModulus 0.005200 36 1003 0.0 0.0003100 205000 #None 0.005300 140 1046 0.0 0.0002000 205000 #None 0.004000 198 759 0.0 0.0003000 205000 #None 0.003900 2286 782 0.0 0.0000900 205000 #None 0.003900 9148 779 0.0 0.0001000 205000 #None 0.003000 12072 611 0.0 0.0000200 205000 #None 0.002900 32822 607 0.0 0.0000000 205000 #None 0.002100 36630 408 0.0 0.0001100 205000 #None 0.002900 43710 579 0.0 0.0000800 205000 #None 0.001500 154204 299 0.0 0.0000400 205000 #None 0.002000 366000 412 0.0 0.0000000 205000 #None 0.001600 481178 325 0.0 0.0000100 205000 #None 0.002000 564396 406 0.0 0.0000200 205000 #None 0.001100 1072768 216 0.0 0.0000500 205000 #None 0.001700 1145994 338 0.0 0.0000500 205000 #None 0.001300 1494000 255 0.0 0.0000600 205000 #None 0.002300 2218000 460 0.0 0.0000600 205000 #None 0.001000 10000000 202 0.0 0.0009900 205000 #Runout 0.001000 10000000 203 0.0 0.0010000 205000 #Runout # #