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1920和1930年代,锻钢、碳钢和合金钢生产者对稀土金属(周期表ⅡA 族—镧系元素)实际是无所知的。1940到1960年代后期之间,在碳钢、合金钢和不锈钢中使用稀土所显示的热和冷成型性方面的好处常被添加剂回收率无规律和显微纯净度不良所掩盖。因此,直到1960年后期,稀土金属的应用还很有限。当时,80,000PSi 高强度低合金钢的发展,证明稳定的球状稀土硫化物和氧硫化物夹杂的形成,使韧性和成型性大为改善。由于整个1970年代冶金工艺的进展,稀土金属的消耗增加到原来的
In the 1920s and 1930s, forgings, carbon steel and alloy steel producers were virtually unknown to rare earth metals (Group IIA - lanthanides). Between 1940 and the late 1960s, the benefits of using rare earths in the production of carbon steel, alloy steel and stainless steel in terms of heat and cold formability were often overshadowed by erratic additive recovery and poor microscopic purity. Therefore, until the late 1960, the application of rare earth metals is still limited. At that time, the development of 80,000 PSI high-strength, low-alloy steel proved that the formation of a stable spherical rare earth sulfide and oxysulfide inclusion greatly improved the toughness and formability. Due to the progress of the metallurgical process throughout the 1970s, the consumption of rare earth metals increased to the original