Stabilisation of retained austenite in laser surface melted tool steels

Abstract In this work, the influence of a cryogenic treatment on the microstructure, mechanical properties and wear resistance of the high-alloyed tool steels X38CrMoV5-3, X153CrMoV12 and ~X190CrVMo20-4 were investigated. Based on tempering curves of the steels, the heat treatment parameters were determined for the mechanical and wear specimens so that the conventionally heat-treated steels and the cryogenically treated steels featured similar hardness. The investigations showed that an almost complete transformation of retained austenite and a more homogeneous distribution of secondary carbides in the microstructure could be achieved by incorporating a cryogenic treatment. However, the cryogenic treatment does not show significantly positive effects on the investigated mechanical properties and wear resistance of the tool steels. The wear resistance of the samples was dominated by primary carbides. The cryogenic treatment would have a positive effect on large tool components with large wall thicknesses in terms of uniform and complete transformation of retained austenite throughout the entire components.

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On the influence of retained austenite in the abrasive wear behaviour of a laser surface melted tool steel

Wear ◽

10.1016/j.wear.2004.09.029 ◽

2005 ◽

Vol 258 (1-4) ◽

pp. 225-231 ◽

Cited By ~ 66

Author(s):

R. Colaço ◽

R. Vilar

Keyword(s):

Abrasive Wear ◽

Tool Steel ◽

Retained Austenite ◽

Laser Surface ◽

Wear Behaviour ◽

Abrasive Wear Behaviour

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THE POSSIBILITIES OF THE RETAINED AUSTENITE REDUCTION ON TOOL STEELS

European Journal of Materials Science and Engineering ◽

10.36868/ejmse.2021.06.02.099 ◽

2021 ◽

Vol 6 (2) ◽

pp. 99-105

Author(s):

László TÓTH

Keyword(s):

Retained Austenite ◽

Tool Steels

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Metallurgical Aspects of Laser Surface Processing of PM Cr-V Ledeburitic Steel

Advances in Materials Science and Engineering ◽

10.1155/2011/563410 ◽

2011 ◽

Vol 2011 ◽

pp. 1-8 ◽

Cited By ~ 8

Author(s):

Peter Jurči ◽

Jiři Cejp ◽

Jan Brajer

Keyword(s):

Solid Solution ◽

Light Microscopy ◽

Retained Austenite ◽

Surface Melting ◽

Laser Surface ◽

Laser Surface Melting ◽

Surface Processing ◽

Microstructural Changes ◽

Type Steel ◽

Eds Microanalysis

The Vanadis 6 ledeburitic-type steel was laser surface remelted. Microstructural changes and hardness in laser affected material were investigated using light microscopy, SEM, and EDS-microanalysis. It was found that the laser surface melting and subsequent rapid solidifying led to softening of the material, due to presence of retained austenite. The melting of the material begins with the transformation of M7C3-carbide into a liquid and finishes via the dissolution of primary solid solution grains. The solidification proceeded in a reverse manner while the eutectics became often so-called degenerous form.

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Tool Steels

10.31399/asm.tb.spsp2.t54410621 ◽

2015 ◽

pp. 621-645

Keyword(s):

Wear Resistance ◽

Phase Transformations ◽

Retained Austenite ◽

High Speed ◽

Cold Work ◽

Heat Treating ◽

Alloy Design ◽

Tool Steels ◽

Evolution Of Microstructure ◽

Alloying Principles

Tools steels are defined by their wear resistance, hardness, and durability which, in large part, is achieve by the presence of carbide-forming alloys such as chromium, molybdenum, tungsten, and vanadium. This chapter describes the alloying principles employed in various tool steels, including high-speed, water-hardening, shock-resistant, and hot and cold work tool steels. It discusses the influence of alloy design on the evolution of microstructure and properties during solidification, heat treating, and hardening operations. It also describes critical phase transformations and the effects of partitioning, precipitation, segregation, and retained austenite.

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