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Cr12MoV钢制造的中小型精密模具的热处理,根据“C”曲线理论和长期实践证明,采用铁板冷却取代一般常用的淬火介质,取得了良好的效果。一、Cr12MoV钢无变形热加工工艺流程Cr12MoV钢合金元素含量多、碳化物多,极易产生碳化物偏析。这些偏析的存在增加了材料的脆性,并使热处理产生不规则的变形,所以锻造是模具质量好坏的重要关键。Cr12MoV钢的锻造应遵循:变向锻造即三个方向的反复镦粗与拔长,使网状碳化物完全破碎,要达到预期的效果锻造比应大于2.5。锻造后中心
According to “C” curve theory and long-term practice, the heat treatment of small and medium-sized precision molds made of Cr12MoV steel has been proved to be effective by using iron plate cooling to replace the commonly used quenching medium. First, Cr12MoV steel without deformation thermal processing process Cr12MoV steel alloy elements and more, more carbide, carbide segregation can easily occur. The existence of these segregation increases the brittleness of the material and causes irregular deformation of the heat treatment, so forging is an important key to the quality of the mold. Cr12MoV steel forging should follow: change forging that is repeated upsetting and pulling in three directions, the mesh carbide completely broken, to achieve the desired effect forging ratio should be greater than 2.5. After forging center