李知伦,马党参,迟宏宵,项金钟,周健

• 1:云南大学物理科学技术学院
• 2:钢铁研究总院特殊钢研究所

摘要(Abstract)：

采用洛氏硬度计、拉伸、冲击以及OM、SEM和TEM等方法,对截面尺寸为695 mm×1360 mm的预硬型大截面718塑料模具钢的组织和力学性能进行研究。结果表明:模块边部组织是回火索氏体组织,1/4处是回火贝氏体和少量上贝氏体的混合组织,在心部发现有细片层状珠光体;试验钢截面硬度比较均匀,头部最大截面硬度差为2.9 HRC,尾部最大截面硬度差为2.3HRC;边部的冲击韧性最高,1/4处由于组织偏析致使冲击韧性值出现较大波动,心部的珠光体组织使冲击韧性急剧恶化。讨论了大模块预硬化塑料模具钢不同组织类型的形成原因及其对力学性能的影响。

关键词(KeyWords)： 大模块718塑料模具钢;显微组织;硬度分布;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 李知伦,马党参,迟宏宵,项金钟,周健

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