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高强度黄铜主要为锰黄铜与铝黄铜,通常ob>40kgf/mm~2,应用广泛。 在铝.锰黄铜中通常加入铁,因它的溶解度很低,常以富铁相形式存在于合金中。它从三个方面影响合金的机械物理性能。 1.细化晶粒已经发现,在铝存在的条件下,细化晶粒作用更显著。细化机理则多数认为依靠包晶转变促进形核,即在铁量足够形成包晶反应时,铜在γ铁上形核,并产生枝晶断裂,导致晶粒细化。但也有人认为富铁相在结晶与再结晶时阻碍晶体生长,或形成Fe_2Zn_7相细化晶粒。 2.提高强度与塑性但对某些牌号的黄铜则无明显的影响。
High-strength brass mainly manganese brass and aluminum brass, usually ob> 40kgf / mm ~ 2, widely used. Iron is usually added to aluminum. Manganese brass, due to its low solubility, is often present in the iron-rich phase in the alloy. It affects the mechanical and physical properties of the alloy from three aspects. 1. Grain refinement It has been found that grain refinement is more pronounced in the presence of aluminum. The refinement mechanism is mostly believed to promote nucleation by means of peritectic transformation, that is, when the amount of iron is sufficient to form peritectic reaction, copper nucleates on the γ-iron and produces dendrite fracture, resulting in grain refinement. However, some people think that iron-rich phase hinders crystal growth during crystallization and recrystallization, or forms Fe 2 Zn 7 phase refined grains. 2. Improve the strength and plasticity of some brands of brass but no significant effect.