Kiyoshi Mizuuchi1, Yoshihira Okanda1 and Itsuo Ohnaka2
1Osaka Municipal Technical Research Institute, Osaka
In order to obtain useful information about the improvement of mechanical properties of Fe-30 mass%Cr-5 mass%Al alloys with decrement carbon content, on Fe-30Cr-5Al alloy whose carbon content decreased to 3.0{×}10-3 mass% was produced. Some examinations were made on this alloy, as-cast and as-rolled, using various techniques such as the tensile test, hardness test, optical microscopy and electron prove microanalysis. The results are summarized as follows:
(1)The precipitation amount of Cr23C6 decreases and mechanical properties are improved with decrement of carbon content. By decreasing carbon content to 3.0{×}10-3 mass%, the tensile strength and elongation of this as-cast alloy are 400 MPa and 2{~}3%, respectively.
(2)The grain size of this alloy decreased with increasing reduction in cold-rolling. However, the grain size less than 350 μm does not affect the mechanical properties of this alloy.
(3)The tensile strength and elongation of this as-hot-rolled alloy are 750 MPa and 30%, respectively.
(4)Critical reduction per 1 pass without cracking increases with decrement in carbon content.
(Received November 22, 1993)
iron-chrominum-aluminum alloy, low carbon, grain size, tensile strength, elongation, rolling, low reduction
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