摘要
通过硬度测试、韧性试验和显微组织比较,在不同的工艺条件下,对比研究了两步法和传统的单步法等温淬火工艺条件下得到的等温淬火球铁(ADI)的组织和性能。结果表明,采用"低温285℃保温形核+高温340℃或370℃等温淬火"的两步法等温淬火工艺与传统的340℃或370℃单步法等温淬火工艺相比,两步法得到的ADI比传统的单步法得到的ADI试样微观组织更细化、硬度显著提高、韧性也有了明显的改善。
The microstructure and mechanical properties of austempered ductile iron（ADI） treated by two-step austempering process and conventional single-step austempering process were investigated by means of hardness test,impact,toughness test and optical microscope.The results show that the microstructure of ADI processed by two-step austempering process,for which the samples austenitized at 900℃ for 1h were initially quenched to 285℃ in a salt bath for 10min and then the temperature of the salt bath was raised to 340℃ or 370℃ and kept at the temperatures for different time,is finer than that of ADI processed by single-step austempering process at the temperatures of 340 or 370℃ for same time.A significant improvement in hardness and impact toughness of the ADI is obtained as a result of the two-step austempering process.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2008年第2期82-85,共4页
Transactions of Materials and Heat Treatment
