Patent ID: 11878344
Assignee: XI'AN JIAOTONG UNIVERSITY
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method of preparing a directionally solidified steel, comprising:
(S1) subjecting a raw material to smelting at 1580-1600° C. and refining to obtain a liquid steel; wherein the raw material comprises pig iron, scrap steel, ferrochromium, ferromanganese, ferroboron, a ferrovanadium, industrially pure iron, ferromolybdenum, ferrotungsten, ferrosilicon and ferrotitanium; and
(S2) subjecting the liquid steel to superheating and directional solidification at a casting temperature of 1420-1430° C. followed by cooling to room temperature to obtain the directionally solidified steel;
wherein the directional solidification is performed in a directional solidification device equipped with a sodium silicate-bonded sand mold as a casting mould; an inner side surface of the sodium silicate-bonded sand mold is coated with an aluminum oxide coating with an average thickness of 0.8-1.1 mm; and
in step (S2), before the directional solidification, the sodium silicate-bonded sand mold is dried at 250-280° C. for 6-8 h.