Effect of Ti Addition on the Microstructure and Properties of a High Speed Steel Roll

Cen Qihong; Jiang Zhiqiang; Fu Hanguang

doi:10.3139/120.110512

Article

Effect of Ti Addition on the Microstructure and Properties of a High Speed Steel Roll

Cen Qihong , Jiang Zhiqiang and Fu Hanguang

Published/Copyright: December 11, 2013

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From the journal Materials Testing Volume 55 Issue 11-12

Abstract

In the present work, the effect of Ti addition on microstructure and properties of high speed steel (HSS) used for rolls was investigated utilizing optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy spectrum analysis. The results indicated that as-cast microstructure of the HSS roll is mainly composed of MC, M₂C and M₇C₃ eutectic carbides and metallic matrix consishing of a mixture of martensite, austenite, and pearlite. The carbides are connected or placed next to each other to form a network along grain boundaries. The addition of 0.5 wt.-% Ti leads to a great change in the morphology, size and distribution of carbides. The carbide network tends to break, and all carbides are refined and distributed homogeneously in the matrix. After normalizing treatment at 1050 °C, the carbides in the Ti containing HSS roll transform into granular or nodular distribution. The mechanical properties, thermal fatigue, and wear resistance of Ti containing HSS roll are more excellent than that of the HSS roll without titanium.

Kurzfassung

In den diesem Beitrag zugrunde liegenden Arbeiten wurde die Auswirkung einer Ti-Zugabe auf die Mikrostruktur und die Eigenschaften eines Schnellarbeitsstahls, (high speed steel-HSS) für Walzen mittels Lichtmikroskopie, Rasterelektronenmikroskopie, Röntgendiffraktometrie und Spektralanalyse untersucht. Die Ergebnisse weisen darauf hin, dass das Gefüge der HSS-Walze vorwiegend aus den eutektischen Carbiden MC, M₂C und M₇C₃ und metallischer Matrix besteht, die eine Mischung aus Martensit, Austenit und Perlit aufweist. Die Carbide sind verbunden oder nebeneinander platziert, sodass sie ein Netzwerk um die Korngrenzen bilden. Die Zugabe von 0,5 wt.- % Ti verursacht große Veränderungen der Morphologie, Größe und Verteilung der Carbide. Das Carbidnetzwerk neigt aufzubrechen und alle Carbide werden fein verteilt und homogen im Gefüge verteilt. Nach einer Normalisierung bei 1050 °C, gehen die Carbide in der Ti-haltigen Walze in eine körnige oder knotenartige Verteilung über. Die mechanischen Eigenschaften sowie der Widerstand gegen thermische Ermüdung und Verschleiß der Ti-haltigen Walze sind deutlich besser als die der Walze ohne Titan.

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Published Online: 2013-12-11

Published in Print: 2013-11-15

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https://doi.org/10.3139/120.110512