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ISO 945-4铸铁显微组织球墨铸铁球化率评定方法解读
Interpretation of ISO 945-4:Microstructure of Cast Irons-Part 4:Test Method for Evaluating Nodularity in Spheroidal Graphite Cast Irons
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- DOI:
- 作者:
- 王泽华 张欣 钱坤才 陈凯敏 朱家辉 张寅
WANG Zehua;ZHANG Xin;QIAN Kuncai;CHEN Kaimin;ZHU Jiahui;ZHANG Yin
- 作者单位:
- 河海大学力学与材料学院 中车戚墅堰机车车辆工艺研究所有限公司 全国铸造标准化技术委员会
School of Mechanics and Materials,Hohai University,Nanjing 211100,China;CRRC Qishuyan Institute Co.,Ltd.,Changzhou 213011,China;National Technical Committee on Foundry Standardization,Shenyang 110022,China
- 关键词:
- 球墨铸铁 球化率 标准化
spheriodal graphite cast iron spheroidization rate standardization
- 摘要:
- 球墨铸铁是一种重要的工程材料,球化率是评定球墨铸铁质量的关键指标。本文综述了国内外主要标准的球墨铸铁球化率定义及相应的评定方法,指出了这些标准中对球化率评定方法存在的差异和问题。“ISO 945-4铸铁显微组织球墨铸铁球化率评定方法”是由我国牵头负责制定的国际标准,该标准规定了目测法和图像法评定球墨铸铁球化率。本文介绍ISO 945-4:2019主要内容,包括标准的术语和名称解释、试样制备、评定方法、检验结果表示等,重点对球形石墨颗粒的定义及其测定方法、球化率的定义及其测定方法、球化率评定相关临界值的确定等进行了解读。本文还介绍了球墨铸铁单位面积石墨颗粒数定义的修正以及球墨铸铁单位面积石墨颗粒数评定方法、表示方法。
Nodular cast iron was an important engineering materials,and the spheroidization rate is the key index to evaluate the quality of nodular cast iron.The definition of spheroidization of nodular cast iron and its evaluation methods in the main standards at home and abroad were reviewed."ISO 945-4 Microstructure of cast iron,Method for evaluating nodular rate of nodular cast iron"was an international standard that our country takes the lead in setting,the standard provides for the evaluation of spheroidization of nodular cast iron by visual and image methods.The main contents of ISO 945-4:2019 were introduced,including the standard terminology and name interpretation,sample preparation,evaluation method,inspection result expression,etc.,especially the definition and determination method of spherical graphite particle,the definition and determination method of spheroidization rate,and the determination of critical value related to evaluation of spheroidization rate.The revision of the definition of graphite particle number per unit area of nodular cast iron and the evaluation and representation of graphite particle number per unit area of nodular cast iron were also introduced.