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在工厂冶炼和实验室冶炼的条件下,在低合金钢中加入稀土金属,鉴定和观察了稀土夹杂物的类别、形状、相变,结果得出:(1)稀土在钢中形成其夹杂物的类型,决定于O/S和(Al·O)/(RE·S)的比值。(2)当钢中含有微量砷,在(RE)/(S+O)≥4.2时,就生成RE-P-As夹杂物。(3)钢中需要控制低的O/S比值才能生成以球状为主的稀土夹杂物;同时冷却速度对球状稀土夹杂物的生成也有影响。(4)钢中的稀土硫化物在高温发生相的转变,相应地有光学性质的变化。
In the factory smelting and laboratory smelting conditions, adding rare earth metals in low alloy steel, identification and observation of rare earth inclusions, shape, phase transition, the results obtained: (1) the formation of rare earth inclusions in steel Depends on the ratio of O / S to (Al · O) / (RE · S). (2) RE-P-As inclusions are formed when trace amounts of arsenic are contained in the steel and (RE) / (S + O) ≧ 4.2. (3) The steel needs to control the low O / S ratio in order to generate rare earth-based inclusions spherical; at the same time the cooling rate of spherical rare earth inclusions also have an impact. (4) Rare earth sulfide in steel undergoes a phase change at high temperatures, with corresponding changes in optical properties.