Abstract:Presently, the study of pressurization technology in steel-making and solidification of high-grade special steels mainly focuses on the N-alloyed stainless steels, especially for high-nitrogen steels. This article reviewed the role of pressurization technology in steel-making and solidification, such as increasing the solubility of volatile elements (N, Ca, Mg, et al.) and improving solidification structure. In this article, experiments on N-alloyed stainless steel 22Cr-21Ni-7.5Mo-0.6N and thermodynamic computing software Thermo-Calc were combined to analyze the influence of pressure on liquid-solid phase transformation. It showed that the solidus and liquidus temperature were increased by 6.60 and 5.98 K under 100MPa compared with those under 0.1 MPa and austenite region was expanded. Pressurization also increased driving force of liquid-solid phase transformation, decreased critical nucleation radius, accelerated nucleation rate and further refined solidification structure. Along with the deepening understanding of the volatile elements, the application prospects of pressurization technology will be very broad and bright in the manufacture of high-grade special steels.
收稿日期: 2015-03-16
出版日期: 2015-10-29
引用本文:
朱红春,姜周华,李花兵,张树才,冯 浩,刘福斌. 加压技术在高品质特殊钢冶炼和凝固中的作用[J]. 钢铁, 2015, 50(11): 37-44.
ZHU Hong-chun,JIANG Zhou-hua,LI Hua-bing,ZHANG Shu-cai,FENG Hao,LIU Fu-bin. Effect of pressurization technology on steel-making and solidification of high-grade special steels. Iron and Steel, 2015, 50(11): 37-44.
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