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Fatigue properties of two Al-containing steels have been investigated by rotating bending fatigue tests. Results show that the fatigue limits (the fatigue strength at 10 7 cycles) were improved remarkably by plasma nitriding due to the high hardness of 1000Hv and compressive stress of 400MPa in the nitrided layer. Scanning electron microscopic observations show that after nitriding the fatigue...
A comprehensive computer system for the material design of HSLA steels is been set up. As one sub-system, the phase transformation module was fundamentally set up based on the classical thermodynamic and kinetic theories. thermo-calc and dictra programs were used to construct the frame of the module. The γ->α phase transformation and the precipitation of microalloy-elements in austenite and during...
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