Enhancement in properties of high-speed steel by laser surface treatment

C. T. Kwok; K. I. Leong; F. T. Cheng; Hau Chung Man

Enhancement in properties of high-speed steel by laser surface treatment

C. T. Kwok, K. I. Leong, F. T. Cheng, Hau Chung Man

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

Abstract

The surface of high-speed steel M2 was treated by a 2.5-kW CW Nd:YAG laser with different power densities for achieving laser transformation hardening and laser surface melting. It was found that M2 cannot be hardened so effectively by laser transformation hardening, with the hardness increased to 415 Hv 0.2 whereas for laser-melted M2. the hardness was increased to 612 Hv0.2, which is at the same level as the conventionally hardened M2. Potentiodynamic polarization test shows that the laser-melted M2 possesses the highest corrosion resistance in 3.5% NaCl solution at 23 °C. The enhancement in the surface hardness and the corrosion resistance of the laser-melted M2 is due to the combined effects of refinement and dissociation of large carbides and the dissolution of the alloying elements (Cr, Mo V and W) in the ultrafine martensitic and austenitic solid solution.

Original language	English
Title of host publication	LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century
Pages	257-262
Number of pages	6
Publication status	Published - 1 Dec 2005
Event	3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005 - Nagoya, Japan Duration: 19 Oct 2005 → 22 Oct 2005

Conference

Conference	3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005
Country/Territory	Japan
City	Nagoya
Period	19/10/05 → 22/10/05

Keywords

Corrosion
Hardness
High-speed steel
Laser surface melting
Laser transformation hardening

ASJC Scopus subject areas

Industrial and Manufacturing Engineering

Cite this

@inproceedings{9f07b36ba1b54488b560e7602d9f89cc,

title = "Enhancement in properties of high-speed steel by laser surface treatment",

abstract = "The surface of high-speed steel M2 was treated by a 2.5-kW CW Nd:YAG laser with different power densities for achieving laser transformation hardening and laser surface melting. It was found that M2 cannot be hardened so effectively by laser transformation hardening, with the hardness increased to 415 Hv 0.2 whereas for laser-melted M2. the hardness was increased to 612 Hv0.2, which is at the same level as the conventionally hardened M2. Potentiodynamic polarization test shows that the laser-melted M2 possesses the highest corrosion resistance in 3.5% NaCl solution at 23 °C. The enhancement in the surface hardness and the corrosion resistance of the laser-melted M2 is due to the combined effects of refinement and dissociation of large carbides and the dissolution of the alloying elements (Cr, Mo V and W) in the ultrafine martensitic and austenitic solid solution.",

keywords = "Corrosion, Hardness, High-speed steel, Laser surface melting, Laser transformation hardening",

author = "Kwok, {C. T.} and Leong, {K. I.} and Cheng, {F. T.} and Man, {Hau Chung}",

year = "2005",

month = dec,

day = "1",

language = "English",

pages = "257--262",

booktitle = "LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century",

note = "3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005 ; Conference date: 19-10-2005 Through 22-10-2005",

}

Enhancement in properties of high-speed steel by laser surface treatment. / Kwok, C. T.; Leong, K. I.; Cheng, F. T. et al.
LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century. 2005. p. 257-262.

Research output: Chapter in book / Conference proceeding › Conference article published in proceeding or book › Academic research › peer-review

TY - GEN

T1 - Enhancement in properties of high-speed steel by laser surface treatment

AU - Kwok, C. T.

AU - Leong, K. I.

AU - Cheng, F. T.

AU - Man, Hau Chung

PY - 2005/12/1

Y1 - 2005/12/1

N2 - The surface of high-speed steel M2 was treated by a 2.5-kW CW Nd:YAG laser with different power densities for achieving laser transformation hardening and laser surface melting. It was found that M2 cannot be hardened so effectively by laser transformation hardening, with the hardness increased to 415 Hv 0.2 whereas for laser-melted M2. the hardness was increased to 612 Hv0.2, which is at the same level as the conventionally hardened M2. Potentiodynamic polarization test shows that the laser-melted M2 possesses the highest corrosion resistance in 3.5% NaCl solution at 23 °C. The enhancement in the surface hardness and the corrosion resistance of the laser-melted M2 is due to the combined effects of refinement and dissociation of large carbides and the dissolution of the alloying elements (Cr, Mo V and W) in the ultrafine martensitic and austenitic solid solution.

AB - The surface of high-speed steel M2 was treated by a 2.5-kW CW Nd:YAG laser with different power densities for achieving laser transformation hardening and laser surface melting. It was found that M2 cannot be hardened so effectively by laser transformation hardening, with the hardness increased to 415 Hv 0.2 whereas for laser-melted M2. the hardness was increased to 612 Hv0.2, which is at the same level as the conventionally hardened M2. Potentiodynamic polarization test shows that the laser-melted M2 possesses the highest corrosion resistance in 3.5% NaCl solution at 23 °C. The enhancement in the surface hardness and the corrosion resistance of the laser-melted M2 is due to the combined effects of refinement and dissociation of large carbides and the dissolution of the alloying elements (Cr, Mo V and W) in the ultrafine martensitic and austenitic solid solution.

KW - Corrosion

KW - Hardness

KW - High-speed steel

KW - Laser surface melting

KW - Laser transformation hardening

UR - http://www.scopus.com/inward/record.url?scp=84883679270&partnerID=8YFLogxK

M3 - Conference article published in proceeding or book

SP - 257

EP - 262

BT - LEM 2005 - 3rd International Conference on Leading Edge Manufacturing in 21st Century

T2 - 3rd International Conference on Leading Edge Manufacturing in 21st Century, LEM 2005

Y2 - 19 October 2005 through 22 October 2005

ER -

Enhancement in properties of high-speed steel by laser surface treatment

Abstract

Conference

Keywords

ASJC Scopus subject areas

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Cite this