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通过真空感应炉试验研究了锆、铝脱氧对含硫易切削非调质钢中硫化物生成行为的影响,研究结果表明,在铝脱氧钢中硫化物大多呈沿晶群聚状分布(大多呈扇形或链状分布),是典型的Ⅱ类硫化物,单位面积硫化物的数量较多,尺寸较小,小于2.5μm的数量较多,大颗粒夹杂数量较少;在锆脱氧钢中硫化物主要也是沿晶的Ⅱ类硫化物,同时也有一些晶内分布的Ⅲ类硫化物,其分布与铝脱氧钢相比有较大改善,单位面积硫化物的数量减少,尺寸增大,大于5μm的数量增多;根据非均质形核理论,(001)Mn S//(001)Zr O_2的点阵错配度为3.0,而(111)Mn S//(0001)Al_2O_3的点阵错配度为26.9,凝固过程中Zr O_2作为硫化物形核核心的效率明显要高于Al_2O_3,向钢中加入锆,非均质形核的Mn S数量增多,使得一部分Mn S在较高的温度下分离析出,硫化物的总数减少、尺寸增大、分布从扇形向链形转变,改善了硫化物分布。
The effect of deoxidation of zirconium and aluminum on the formation of sulfide in non-quenched and tempered sulfur-free steels was studied by means of vacuum induction furnace. The results show that most of the sulfides in the deoxidized steel are intergranular clusters (mostly Fan-shaped or chain-like distribution), is a typical type II sulfide, the number of sulfide per unit area is larger, smaller size, the number of less than 2.5μm, the smaller number of large particles inclusions; zirconia deoxidized steel sulfide Mainly along the crystal type II sulfide, but also some of the distribution within the class III sulfide, its distribution and aluminum deoxidation has greatly improved the number of units per unit area of the sulfide to reduce the size increases, greater than 5μm According to the heterogeneous nucleation theory, the lattice mismatch degree of (001) Mn S // (001) Zr O_2 is 3.0, and the lattice mismatch degree of (111) Mn S // (0001) Al 2 O 3 Is 26.9, the efficiency of ZrO_2 as nucleus of sulfidation nucleation is obviously higher than that of Al_2O_3 during solidification. Adding zirconium into the steel increases the number of heterogeneous nucleation MnS, so that a part of MnS separates at higher temperature Precipitation, reducing the total number of sulfide, the size increases, the distribution from the fan-shaped chain to improve the sulfide Cloth.