# SAE 4140 ultra low Sulfur, Q+T, Periodic Overload Tests, HRc=40.5 # MacSteel Ht. M18322, ElecFurn ConCast Forged 2150F # to 2.5"sq bars, 83% reduction # Normalized, 1550F, Quenched+Tempered # Specimens machined transverse to bar length. # Chem.: 0.41wt%C .87Mn .01P .0040S .2400Si .100Cu .050Ni # .900Cr .180Mo .020Al .0050Sn 58ppm_N # Inclusion Rating TypeA(sulfide) 0.5T 0H, TypeB(alumina) 0T 0H # TypeC(silicate) 0T 0H, TypeD(globular) 1T 0.5H # Martensite, %= 100 # File is a combination Iter.99 short life+ Iter.116 # Tested by J.Lindsey(for POL) U.Toledo 2011 #FileType= strain_life #DataType= raw #Name= SAE4140 #Name= AISIiter116+99 #Units= MPa #Sy= 1261.0 #Su= 1333. #eu= 0.04 engr. strain at Su #E= 209400 average of 11 initial. Reported=208100 #monotonic_K= 1558. #monotonic_n= 0.035 #LowerYield= 1252. #UpperYield= 1258. #MaterialForm= bar #FailureDef= 50% load drop #%RA= 44 % #%Elongation= 30.8 % over 0.3 inch #FractureStress= 1518 #FractureStrain= 0.581 #BHN= 375 #Hardness, Rockwell C= 40.5 #strAmp 2Nv StsAmpl So PlsStrAmp Emod 0.019970 190 1098 -20.1 0.014690 208200 #IGL 0.019900 378 1089 -12.8 0.014630 209200 #IGL 0.019800 390 1112 -13.2 0.014500 210600 #IGL 0.009980 1642 942 -12.1 0.005450 207900 #IGL 0.010000 1852 931 -12.0 0.005520 210600 #IGL 0.009910 2032 930 -8.3 0.005440 208900 #IGL 0.004990 17148 818 -53.7 0.001060 207900 #IGL 0.005020 18062 832 -11.5 0.001020 209400 #IGL 0.005030 22754 833 -36.7 0.001030 210300 #IGL #0.003750 65280 776 0.0 0.000000 209400 #IGL Not used in POL #0.003750 81202 800 11.7 0.000000 212700 #IGL " #0.003750 103218 788 58.1 0.000000 207700 #IGL " #0.003250 147330 672 0.0 0.000000 209400 #IGL not used for POL #0.003250 210654 672 0.0 0.000000 209400 #IGL not used for POL #0.003000 247200 621 0.0 0.000000 209400 #IGL not used for POL #0.002750 2011184 569 0.0 0.000000 209400 #IGL not used for POL #0.002750 3712452 569 0.0 0.000000 209400 #IGL not used for POL #0.002750 10000000 569 0.0 0.000000 209400 #Runout not used for POL #Tests above are from CA Iter 99 #Rows with # in 1st col are commented out. Not used. #Tests below are POL from Iter 116 #Tests at .00211 and below were in load control and #precycled at Overload Strain ampl. of 0.0050 for 1000 cycles #See fatigue report. .00324 50214 652 312 .00011 209400 .00324 37494 653 184 .00011 209400 .00211 101938 418 569 .00010 209400 .00210 44020 417 570 .00010 209400 #at Surface defect .00205 34136 417 570 .00005 209400 #at Surface defect .00204 93900 416 570 .00004 209400 .00105 365504 204 783 .00007 209400 .00105 446330 205 783 .00007 209400 .00063 13209526 123 866 .00004 209400 .00062 9286964 123 874 .00003 209400 .00042 26144830 82.7 907 .00003 209400 #at Surface defect #Carbon, %= 0.4100 #Manganese, %= 0.8700 #Phosphorus, %= 0.0100 #Sulfur, %= 0.0040 #Silicon, %= 0.2400 #Copper, %= 0.1000 #Nickel, %= 0.0500 #Chromium, %= 0.9000 #Molybdenum, %= 0.1800 #Aluminum, %= 0.0200 #Tin, %= 0.0050 #Nitrogen, ppm= 58.0000 # #