State-of-the-Art PCI Technology for Blast Furnace Ensured by Continuous Technological and Economical Improvement

Posted on 08 March 2013
 

By Peter Jurci, Otakar Prikner, Petra Salabova, and Jana Sobotova

The effect of cryogenic treatment (CT) on the properties of ledeburitic tool steels was investigated. CT is also used in conventional heat treatment to improve mechanical properties and wear resistance and decrease the amount of retained austenite.

The technology of CT was developed in the 1960s and still elicits contrary scientific opinions today. Some studies report that CT improves hardness, wear resistance, bending strength, toughness, fatigue strength, etc., but some scientists do not agree. Also, experts do not agree as to the main factor influencing results when CT is applied – austenitizing temperature, cooling rate, quench temperature, holding time, heating rate or tempering temperature.

    The mechanism of fine carbide precipitation provides the most serious discussion. When exactly do they form, and what is their effect on mechanical properties? The steel grade treated by CT is also important. A significant effect is seen for X153CrVMo12 (AISI D2) steel, and others are more disputable. Our experimental work is focused on PM-produced, wear-resistant ledeburitic tool steels. The goal is to determine the optimal CT (temperature and time) that can help to prolong the life cycle of cold-work tools, keeping in mind the economics of additional treatments. The investigation discovered many interesting results but raised even more questions.



Source: Robin Schott



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