| 摘要 |
1. Turbine blade material of high corrosion fatigue strength with a two-phased mixed structure of austenite and ferrite or austenite and martensite, consisting of Carbon = 0.005 to 0.06% by weight Chromium = 18 to 30% by weight Molybdenum = 1 to 6% by weight Nickel = 2 to 6% by weight Manganese = 4 to 8% by weight at least one of the elements copper, titanium and aluminium, the content of each individual element being at least 0.2% by weight and the total content of copper, titanium and aluminium being 0.5 to 4% by weight, and optionally 0.2 to 1.5% by weight of nitrogen, the remainder being iron and unavoidable impurities, this material having a yield stress of at least 800 MPa, and elongation at break of at least 15% for a specimen length : specimen diameter ratio = 4.4 and a fatigue strength relative to alternating tensile/compressive stresses, under aerated 4N NaCl solution of pH = 5 at 80 degrees C, of at least 350 MPa without a static preload and of at least +- 250 MPa under a static preload of + 250 MPa relative to 10**8 load changes, and a notched impact strength of at least 50 J per cm**2 . |
