徐春杰,郭权芬,张婷,刘永辉,黄志强,张忠明

• 1:西安理工大学材料科学与工程学院
• 2:陕西华安铸铁型材有限公司

摘要(Abstract)：

采用水平连续铸造工艺制备了矩形截面120 mm×100 mm灰铁型材,对比研究了不同温度奥氏体化对正火组织与性能的影响。结果表明,该灰铁型材表层10 mm处为D型石墨,1/2R为E型石墨,心部为A型石墨,基体中的珠光体分别为5%,15%和15%。880、900和920℃分别保温2 h后出炉空冷的正火组织,表层10 mm处珠光体含量均接近80%;1/2R处的珠光体含量分别为40%、50%和60%;心部的珠光体含量分别为30%、40%和50%。铸态表层硬度为92 HRB,1/2R处和心部硬度低于表层,硬度差为6.4 HRB,正火热处理能够提高灰铁型材心部力学性能,降低不同部位的硬度差和拉伸强度差。正火温度越高,越有利于石墨片附近获得高碳奥氏体,有利于珠光体的形成,有利于灰铁型材断面组织与性能均匀性的提高。920℃×2 h正火,表层的拉伸强度超过350 MPa,断面性能均匀性得到提高,表层和心部的拉伸强度差仅为30 MPa。

关键词(KeyWords)： 水平连续铸造;灰铁型材;组织与性能;正火

Abstract:

Keywords:

基金项目(Foundation): 陕西省协同创新计划项目(2015XT-50);; 陕西省技术创新引导计划项目(2017);; 陕西省教育厅科研计划项目-服务地方专项(产业化培育项目)(2017)资助

作者(Author): 徐春杰,郭权芬,张婷,刘永辉,黄志强,张忠明

DOI: 10.13289/j.issn.1009-6264.2017.04.022

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