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考察了两种低合金钢板(卷)断口中沿晶型分层与磷偏析带的对应关系。结果表明,偏析带脆化是产生断口沿晶型分层的根源,它具有可逆回火脆性的特征。当板(卷)以较小的冷速通过回火脆性敏感温区时,偏析带上较高浓度的杂质和合金元素在晶界(原奥氏体晶界或铁素体晶界)发生再偏析,引起晶间脆性。此外,偏析带上的硫化物夹杂偏聚也加剧了脆性。
The relationship between the stratification and the phosphorus segregation zone in two kinds of low alloy steel (coil) fracture was investigated. The results show that the segregation zone embrittlement is the root cause of fracture along the crystal layer, which has the characteristics of reversible tempering brittleness. When the plate (coil) passes through the temper embrittlement sensitive temperature zone at a relatively low cooling rate, the higher concentrations of impurities and alloying elements on the segregation zone occur at the grain boundaries (the original austenite grain boundaries or the ferrite grain boundaries) Segregation, causing intergranular brittleness. In addition, segregation of sulfide inclusions segregation also exacerbated brittleness.