Effect of austempering temperature on microstructure and tribological behaviour of hypoeutectic austempered ductile iron alloyed with copper

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS

Tribology - Materials, Surfaces & Interfaces Pub Date : 2022-08-04 DOI:10.1080/17515831.2022.2105990

U. Batra, Manpreet Singh, Sandan Kumar Sharma

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引用次数: 3

Abstract

ABSTRACT In the present work, Cu alloyed ductile iron was isothermally treated at five different temperatures (280°C, 300°C, 320°C, 350°C, and 380°C) for 1 h to obtain an ausferrite microstructure composing a very fine ferrite phase and carbon enriched austenite. Microstructural characteristics exhibited a high ultimate tensile strength of 950–1600 MPa of ADI comparable to or even stronger than forged steels. The bulk hardness was 460–288 HV10, higher than pearlite, but lower than pure martensitic. The tribological behaviour of ADI was investigated using a 10 mm pin diameter during sliding. Its friction coefficient decreased almost by half as compared with ductile iron due to its ausferritic morphology and carbon enrichment. Under oxidative and adhesive conditions, an austempered microstructure with very fine ferrite and high carbon austenite is most wear-resistant due to its adequate strength, toughness, and lubricative behaviour. Wear resistance of ADIs can be improved through tailoring microstructure through austempering. GRAPHICAL ABSTRACT

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等温回火温度对铜合金亚共晶等温球墨铸铁组织和摩擦学性能的影响

摘要在本工作中，铜合金球墨铸铁在五个不同的温度（280°C、300°C、320°C、350°C和380°C）下等温处理1小时，以获得由非常细的铁素体相和富碳奥氏体组成的奥氏体微观结构。微观结构特征显示出950–1600 MPa的高ADI极限抗拉强度，与锻钢相当，甚至比锻钢更强。整体硬度为460–288 HV10，高于珠光体，但低于纯马氏体。使用直径为10mm的销研究了ADI在滑动过程中的摩擦学行为。由于其奥氏体形态和碳富集，其摩擦系数与球墨铸铁相比几乎降低了一半。在氧化和粘合条件下，具有非常细的铁素体和高碳奥氏体的奥氏体回火微观结构由于其足够的强度、韧性和润滑性能而最耐磨。ADIs的耐磨性可以通过等温淬火调整微观结构来提高。图形摘要

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来源期刊

Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-

CiteScore

2.80

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0.00%

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