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比较了三种不同冶炼工艺(平炉与电炉混合炼钢经RH真空循环脱气处理、碱性电炉冶炼及电炉冶炼加电渣重熔)和两种不同脱氧方法(并用铝、钛或仅用铝脱氧)生产的五炉18Cr2Ni4WA钢的过热敏感性并观察了断口.实验表明,这种钢产生严重过热井出现石状断口的条件是:(1)钢在高温加热时原始奥氏体晶粒充分长大;(2)钢中含有MnS夹杂物以细小的颗粒沉淀在原始奥氏体晶界上,并用铝、钛脱氧使钢中含有微量残留钛可以在高温加热过程中阻止奥氏体晶粒长大同时改善MnS夹杂物的形态和分布状况,从而有效地降低了这种钢的过热敏感性。最后,讨论了这种钢形成石状断口的机构。
The effects of three different smelting processes (degassing of RH vacuum cycle on BF and EAF, smelting in EAF and ESR) and two different deoxidation methods (using aluminum, titanium or aluminum only Deoxidation), the overheat sensitivity of 18Cr2Ni4WA steel was observed and the fracture was observed.Experiments showed that the condition of stone-like fracture in severe overheating of this kind of steel was as follows: (1) The original austenite grains were full when the steel was heated at high temperature Grow up; (2) Inclusion of MnS in the steel to fine particles precipitated on the original austenite grain boundaries, and with aluminum, titanium deoxidation of trace amounts of residual titanium steel can prevent high-temperature heating in the process of austenite grain Growth and improve the morphology and distribution of MnS inclusions, thus effectively reducing the overheating sensitivity of this steel. Finally, the mechanism of forming such fractures of stone into stone is discussed.