Experimental and numerical study of AISI 4130 steel surface hardening by pulsed Nd: YAG laser

Giuseppe Casalino; Mahmoud Moradi; Mojtaba Karami Moghadam; Ali Khorram; Patrizia Perulli

doi:10.3390/ma12193136

Experimental and numerical study of AISI 4130 steel surface hardening by pulsed Nd: YAG laser

Giuseppe Casalino, Mahmoud Moradi^*, Mojtaba Karami Moghadam, Ali Khorram, Patrizia Perulli

^*Corresponding author for this work

Research output: Contribution to Journal › Article › peer-review

Abstract

Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.

Original language	English
Article number	3136
Journal	Materials
Volume	12
Issue number	19
Early online date	26 Sept 2019
DOIs	https://doi.org/10.3390/ma12193136
Publication status	Published - 26 Sept 2019
Externally published	Yes

Keywords

laser surface transformation hardening
Nd:YAG pulsed laser
AISI 4130 steel
FEM model

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title = "Experimental and numerical study of AISI 4130 steel surface hardening by pulsed Nd: YAG laser",

abstract = "Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.",

keywords = "laser surface transformation hardening, Nd:YAG pulsed laser, AISI 4130 steel, FEM model",

author = "Giuseppe Casalino and Mahmoud Moradi and Moghadam, {Mojtaba Karami} and Ali Khorram and Patrizia Perulli",

year = "2019",

month = sep,

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doi = "10.3390/ma12193136",

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T2 - YAG laser

AU - Casalino, Giuseppe

AU - Moradi, Mahmoud

AU - Moghadam, Mojtaba Karami

AU - Khorram, Ali

AU - Perulli, Patrizia

PY - 2019/9/26

Y1 - 2019/9/26

N2 - Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.

AB - Laser surface transformation hardening (LSTH) of AISI 4130 was investigated by a Nd:YAG pulsed laser. Laser focal height (LFH), pulse width (LPW), scanning speed (LSS), and power (LP) varied during the experiments. The microstructure of the treated zone was characterized by optical (OM) and field emission scanning electron microscopy (FESEM). Micro-hardness was measured in the width and depth directions. Results showed that the hardness and depth of hardened layer increased by decreasing the LSS and the laser focal position (LFP), and by increasing the LPW. The results were compared with those obtained by furnace heat treatment of the same steel. Eventually, a finite element model was employed for the simulation of the LSTH of AISI 4130 steel and calculation of the heat-treated zone. The results showed that the model can predict with accuracy the temperature profile and the size and the shape of the laser hardened region.

KW - laser surface transformation hardening

KW - Nd:YAG pulsed laser

KW - AISI 4130 steel

KW - FEM model

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U2 - 10.3390/ma12193136

DO - 10.3390/ma12193136

M3 - Article

SN - 1996-1944

VL - 12

JO - Materials

JF - Materials

IS - 19

M1 - 3136

ER -

Experimental and numerical study of AISI 4130 steel surface hardening by pulsed Nd: YAG laser

Abstract

Keywords

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