Effect of minor reactive metal additions on fracture toughness of iron-12-percent nickel alloy at -196 ̊and 25 ̊C
Walter R. Witzke, Joseph R. Stephens, Lewis Research Center, United States. National Aeronautics and Space Administration
U.S. National Aeronautics and Space Administration, 1976 - Technology & Engineering - 36 pages
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0.25 percent Nb 9Ni steel Alloying Elements alloys at 196 alloys containing Nb annealed at 550 annealed at 685 atomic percent austenite bend precracked Charpy binary Fe-12Ni alloy cerium Cft Cft Cft Cft O O Cft rH Charpy fracture toughness CM Cft CM CM CM CM rH Cryogenic ductility Fe-12Ni alloys containing Fe-12Ni binary alloy ferrite hafnium high toughness highest toughness Hot rolling improvement in toughness increased ingots KIcd KJcd ksiyin lanthanum low temperature toughness lowest annealing temperature Maraging Steels martensite maximum in toughness maximum toughness microstructure mischmetal Nb additions Niobium peak toughness precracked Charpy fracture reactive metal added reactive metal additions reactive metal concentration rH rH CM room temperature toughness Slow bend precracked three annealing conditions three annealing temperatures toughness and tensile toughness at 196 toughness improvement toughness of Fe-12Ni Trans vanadium water quenching X-ray diffraction yield strength