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一、问题的提出高锰钢的耐磨性和铸造质量特别是冶金质量有关。由于高锰钢的导热率仅为碳钢的1/3～1/2,使钢液凝固缓慢,树枝晶粗大。特别是当浇注温度很高时,容易生成柱状晶。在厚大断面的情况下或铸型导热不良时,很可能出现穿晶,在宏观上表现为粗大的柱状晶贯穿整个断面,在微观上表现为奥氏体晶粒极为粗大,碳化物和珠光体大量沿晶界析出(图1、
First, the problem raised High manganese steel wear resistance and casting quality, especially metallurgical quality. Since the thermal conductivity of high manganese steel is only 1/3 ~ 1/2 of carbon steel, the liquid steel solidifies slowly and the dendrite is coarse. Especially when the casting temperature is high, easy to generate columnar crystals. In the case of thick section or poor thermal conductivity of the mold, it is likely to appear transgranular, macroscopically coarse columnar crystals appear throughout the cross-section, microscopically austenite grains are extremely coarse, carbides and pearlescent A large number of body precipitation along the grain boundaries (Figure 1,