# # SAE8620 Thru Carburized Rc=62 50%Bainite 50%Martensite # Material cyclically hardens to elastic conditions. MacSteel Ht. M10367 # ElecFurnace, LadleRefined, ConCast(152x152mm) HotRolled to 29.7mm bar # Spec. machined from the cylindrical bars and case carburized reaustenitized # and isothermally transformed to achieve 50% martensite and 50% bainite. # Original Chem.= 0.21wt%C .93Mn .009P .032S .25Si .15Cu .46Ni .50Cr # .20Mo 0V 0Nb .024Al 0Pb .002Ti 0Ca .01Co 0Zr .0003B .01Sn # 9ppm_O 63ppm_N # Inclusions: TypeA=1.2T TypeB=0.5T 0.3H TypeC=0.2T TypeD=1.5T 0.5H # Test: UoW A.Rteil and T.Topper June2007 #FileType= strain_life #DataType= raw #Name= SAE8620 #Name= AisiIt_89 #Stress_units= MPa #Strain_units= strain #Sy= 1114.0 #Su= 1497.0 #E= 190832. is average of Initial Emods. # Reported: #E= 206100 from tensile test? #monotonic_K= 7198.0 #monotonic_n= 0.300 #FractureStrain= 0.013 #FractureStress= 1497. #%RA= 0 measured No plastic deformations. #MaterialForm= bar #FailureDef= 50% load drop #Hardness, Rockwell C= 62 on surface, 55 in core #BHN= 688 #StrAmp 2Nf StsAmp So CalcPlasStr InitialModulus #Discard 0.00869 90 1593 0.0 0.00000 190832 #9 retest #8 small #fisheye near edge 0.00789 154 1508 0.0 0.00000 190832 #11 probably small #fisheye near edge 0.00800 596 1486 0.0 0.00000 190832 #1 surface initiation 0.00451 1012 864 0.0 0.00000 190832 #21 No info. 0.00498 2084 969 0.0 0.00000 190832 #13 retest #12 probably surface 0.00501 26560 914 0.0 0.00000 190832 #16 No info. 0.00451 31294 864 0.0 0.00000 190832 #3 No info. 0.00392 32332 735 0.0 0.00000 190832 #22 Huge #fisheye at center 0.00398 44292 791 0.0 0.00000 190832 #4 Multiple #fisheye at center 0.00455 138462 864 0.0 0.00000 190832 #20 No info. 0.00503 169064 979 0.0 0.00000 190832 #2 Large #fisheye at 1/3 diam. 0.00369 213964 713 0.0 0.00000 190832 #5 Surface initiation 0.00355 313676 679 0.0 0.00000 190832 #6 Huge #fisheye near center 0.00323 367060 620 0.0 0.00000 190832 #7 medium #fisheye near center 0.00399 1473330 744 0.0 0.00000 190832 #18 Large #fisheye at 1/3 diam. 0.00302 10000000 580 0.0 0.00000 190832 #Runout #12 0.00346 10000000 646 0.0 0.00000 190832 #Runout #15 0.00303 10000000 588 0.0 0.00000 190832 #Runout #8 0.00304 10000000 582 0.0 0.00000 190832 #Runout #10 ?failed Tens.Test? #Basic Oxygen= False #Electric Furnace= True #Vacuum Degas= False #Ladle Refined= True #Ingot Cast= False #Continuous Cast= True #Bainite, %= 50 #Martensite, %= 50 #Carbon, %= 0.21 #Manganese, %= 0.83 #Phosphorus, %= 0.009 #Sulfur, %= 0.032 #Silicon, %= 0.25 #Copper, %= 0.15 #Nickel, %= 0.46 #Chromium, %= 0.5 #Molybdenum, %= 0.2 #Vanadium, %= 0.00 #Columbium/Niobium, %= 0.00 #Aluminum, %= 0.024 #Lead, %= 0.001 #Titanium, %= 0.002 #Calcium, %= 0.00 #Cobalt, %= 0.006 #Zirconium, %= 0.001 #Boron, %= 0.0003 #Tin, %= 0.006 #Oxygen, ppm= 9 #Nitrogen, ppm= 63 # #