WORKPIECE MADE OF HIGH STRENGTH STEEL HAVING EXCELLENT NOTCH FATIGUE STRENGTH, AND METHOD FOR PRODUCING THE SAME

PROBLEM TO BE SOLVED: To provide a workpiece made of a high strength steel which is composed of a low alloy TRIP type annealed martensitic steel (TAM steel) having high hardenability and high notch fatigue strength by controlling the componential addition of the chemical composition and heat treatme...

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Bibliographische Detailangaben
Hauptverfasser:	FUJI DAIKI, YOSHIKAWA NOBUO, TAKAHASHI TERUHISA, ARAI GORO, SUGIMOTO KOICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CHEMISTRY COMBINED OPERATIONS COMBUSTION ENGINES FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS LIGHTING MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OTHER WORKING OF METAL PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS UNIVERSAL MACHINE TOOLS WEAPONS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a workpiece made of a high strength steel which is composed of a low alloy TRIP type annealed martensitic steel (TAM steel) having high hardenability and high notch fatigue strength by controlling the componential addition of the chemical composition and heat treatment conditions without depending on forging temperature, forging ratio or the like. SOLUTION: The workpiece has a composition comprising 0.1 to 0.7% C, ≤2.5% Si, 0.5 to 2% Mn, ≤1.5% Al, one or more kinds selected from Nb, Ti and V by 0.01 to 0.3% in total, ≤2.0% Cr, ≤0.5% Mo, ≤1.0% Ni, Cr, and Mo and Ni by ≤2.0% in total and ≤0.005% B, and in which the concentration of carbon in retained austenite is 0.7 to 1.5 mass%, and a value(Ceq*) obtained by removing the C content from carbon equivalent (Ceq) is 0.3 to