科研之友
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摘要
A new ferrite steel Cr27Mo6Al3Cu with high Mo and low Al is developed, exhibiting excellent oxidation resistance, corrosion resistance, and mechanical property. Alloy rods with a diameter of 10 mm were prepared by copper mold suction-casting method and then solution-treated at 1373 K for 2 h. The experimental results show that this alloy maintains a stable monolithic BCC microstructure. After oxidization at 1373 K for 100 h, a dense and thin oxide layer is generated on the surface of the alloy with the weight gain per unit area G(+) being about 0.4863 g/m(2). Its corrosion-resistant property in 3.5 wt.% NaCl at 298 K is characterized with the corrosion potential E-corr being about -0.091 V, pitting corrosion potential E-b reaching up to 0.867 V. Its mechanical properties are yield tensile strength sigma(0.2) = 523 MPa, ultimate tensile strength sigma(b) = 637 MPa respectively.
