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研究了碳和合金元素对塑料模具钢在空冷和沙冷时的组织转变和硬度的影响。试验结果表明 ,为保证钢在两种冷却情况下都得到粒状贝氏体的关键控制元素为 [C]≥ 0 2 %、Mn(eq) =[Mn]+ [Cu]+ [Cr]+ 0 6 7[Si]+ 2 [V]+ 1 33[Mo]+ 0 33[Ni]+ 1 0 0 [B]≥ 2 80。在此基础上 ,测定了满足这一条件的钢在热变形条件下的奥氏体连续冷却转变 (CCT)曲线。结果发现 ,该成分的钢在冷速 0 0 2～ 1℃ /s范围内均得到粒状贝氏体 ,并且其硬度为VHN 2 75～2 80 ,几乎无差别 (变化范围在 1 0VHN内 )。工业生产结果表明 ,研制的非调质贝氏体型大截面塑料模具钢 ,厚度为 4 0 0mm的模块表面到中心得到均匀分布的贝氏体 ,其硬度分布也很均匀。
The effects of carbon and alloying elements on the microstructure and hardness of plastic mold steel during air cooling and sand cooling were investigated. The experimental results show that the critical control element for obtaining granular bainite in both cooling conditions is [C] ≥ 0 2%, Mn (eq) = [Mn] + [Cu] + [Cr] + 0 6 7 [Si] + 2 [V] + 1 33 [Mo] + 0 33 [Ni] + 1 0 0 [B] ≥ 2 80. On this basis, the austenite continuous cooling transformation (CCT) curve of the steel satisfying this condition was measured under hot deformation conditions. The results showed that the steels of this composition all obtained granular bainite at the cooling rate of 0 0 2 ~ 1 ℃ / s and the hardness was VHN 2 75 ~ 2 80 with almost no difference (the variation range was within 10VHN). Industrial production results show that the development of non-quenched and tempered bainitic large cross-section plastic mold steel, the thickness of 400mm module surface to the center to be evenly distributed bainite, the hardness distribution is also very uniform.