Effects of austempering time on the microstructure and properties of austempered ductile iron

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

Metallurgical Research & Technology Pub Date : 2022-01-01 DOI:10.1051/metal/2022011

Z. Shi, Mengjie Dong, Yufu Sun, Jiangtao Ma, Xueshan Du, Jingyu Zhao

引用次数: 1

Abstract

The effects of austempering time on the structure and properties of high-strength austempered ductile iron were studied by using optical microscopy (OM), X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results show that the matrix structure of austempered ductile iron (ADI) consists of acicular ferrite and retained austenite. With the increase of austempering time, the content of acicular ferrite increases and the content of retained austenite first increases and then decreases, which results in tensile strength, elongation and impact toughness increase whereas hardness and wear resistance decreases. The fracture characteristics of the ADI specimens change from brittle fracture to ductile fracture with the increase of austempering time. ADI has excellent comprehensive mechanical properties after austenitizing at 900 °C for 90 min and then austempering at 250 °C for 120 min.

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等温回火时间对等温球铁组织和性能的影响

采用光学显微镜(OM)、x射线衍射仪(XRD)和扫描电镜(SEM)研究了等温回火时间对高强等温球墨铸铁组织和性能的影响。结果表明，等温球墨铸铁(ADI)的基体组织由针状铁素体和残余奥氏体组成。随着等温回火时间的延长，针状铁素体含量增加，残余奥氏体含量先增加后减少，导致拉伸强度、伸长率和冲击韧性提高，硬度和耐磨性降低。随着等温回火时间的延长，ADI试样的断裂特征由脆性断裂向韧性断裂转变。在900℃奥氏体化90 min后，再在250℃等温回火120 min, ADI具有优异的综合力学性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Metallurgical Research & Technology METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.70

自引率

9.10%

发文量

审稿时长

4.4 months

期刊介绍： Metallurgical Research and Technology (MRT) is a peer-reviewed bi-monthly journal publishing original high-quality research papers in areas ranging from process metallurgy to metal product properties and applications of ferrous and non-ferrous metals and alloys, including light-metals. It covers also the materials involved in the metal processing as ores, refractories and slags. The journal is listed in the citation index Web of Science and has an Impact Factor. It is highly concerned by the technological innovation as a support of the metallurgical industry at a time when it has to tackle severe challenges like energy, raw materials, sustainability, environment... Strengthening and enhancing the dialogue between science and industry is at the heart of the scope of MRT. This is why it welcomes manuscripts focusing on industrial practice, as well as basic metallurgical knowledge or review articles.