International Journal of Iron & Steel Society of Iran

International Journal of Iron & Steel Society of Iran

Investigation the Microstructure and Mechanical Properties of 17-7 PH Stainless Steel Welded by Pulsed Nd-YAG Laser Beam

Document Type : Research Paper

Authors
H. Rafiei 1
R. Shoja Razavi 2
1 Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
2 Department of Mechanical, Materials and Manufacturing Engineering (MMME), Faculty of Science and Engineering, University of Nottingham Ningbo China (UNNC), Ningbo, China
10.22034/ijissi.2026.2062223.1322
Abstract
In this research, the metallurgical investigation of the welding of 17-7 PH steel using the Nd: YAG pulsed laser welding process was conducted. The effect of parameters such as welding speed, laser pulse width and power on welding geometry was evaluated. The microstructure and fracture surface of weld samples were studied using the optical microscope and scanning electron microscope (SEM). Also, in order the tensile, microhardness and impact tests were used to study the mechanical behavior of the joint. It was found that the microstructure of the weld metal of the samples contained skeletal and lathy ferrite as well as austenite. The maximum tensile strength was observed in the sample with power 300, welding speed 2 and pulse width 3.5, and the minimum tensile strength was observed in the sample with power 300, welding speed 2 and pulse width 3. The SEM images of the tensile cross section showed that the failure occurred in all the soft samples. As a result, in this study, the best mechanical and microstructural results were obtained in the welded sample with optimal parameters including power 300, welding speed 2 and pulse width 3.5.
Keywords
Laser Welding
17-7 PH Stainless Steel
Welding Speed
Pulse Width
Power
[1] Michael F, Stainless steels for design engineers, Materials Park (OH): ASM International. 2008.
[2] McGuire M.F, Stainless steels for design engineers, Materials Park (OH): ASM International. 2008.
[3] Burnett H.C, Duff R.H, Vacher H.C, Identification of metallurgical reactions and their effect on the mechanical properties of 17-7 PH stainless steel, J Res Natl Bur Stand C Eng Instrum. 1962; 66C: 113-9.
[4] Peng Y, Tian Z.L, Chen W.Z, et al. Laser welding of ultra-fine-grained steel SS400, Iron Steel Res Int. 2003; 10: 32-36.
[5] Malek Ghaini F, Hamedi M.J, Torkamany M.J, Sabbaghzadeh J, Weld metal microstructural characteristics in pulsed Nd: YAG laser welding, Scr Mater. 2007; 56: 955-958.
[6] Dawes C, Laser welding: a practical guide, Abington: Abington Publishing. 1992.
[7] Han W.J, Byeon J.G, Park K.S, Welding characteristics of Inconel plate using a pulsed Nd: YAG laser beam, J Mater Process Technol. 2001; 113: 234-237.
[8] Bagger C, Olsen F.O, Review of laser hybrid welding, J Laser Appl. 2005; 17.
[9] Torabi A, Kolahan F, Optimizing pulsed Nd: YAG laser beam welding process parameters to attain maximum ultimate tensile strength for thin AISI 316L sheet using response surface methodology and simulated annealing algorithm, Opt Laser Technol. 2018; 103: 300- 310.
[10] Katayama S, Kawahito Y, Mizutani M, Elucidation of laser welding phenomena and factors affecting weld penetration and welding defects, Phys Procedia. 2010; 5:9-17.
 [11] Fernandes F.A.O, Oliveira D.F, Pereira A.B, Optimal parameters for laser welding of advanced high-strength steels used in the automotive industry. Procedia Manuf. 2017; 13: 219-226.
[12] Akbari Mousavi S.A.A, Sufizadeh A.R, Metallurgical investigations of pulsed Nd: YAG laser welding of AISI 321 and AISI 630 stainless steels, Mater Des. 2009; 30: 3150-3157.
[13] Baghjari S.H, Akbari Mousavi S.A.A, Effects of pulsed Nd: YAG laser welding parameters and subsequent post-weld heat treatment on microstructure and hardness of AISI 420 stainless steel, Mater Des. 2013; 43: 1-9.
 [14] Zhang P, Jia X, Yu Z, Shi H, Li S, Wu D, Yan H, Ye X, Chen J, Wang F, Tian Y, A review on the effect of laser pulse shaping on the microstructure and hot cracking behavior in the welding of alloys, Opt Laser Technol. 2021; 140: 107094.
[15] Jia X, Luo J, Li K, Wang C, Li Z, Wang M, Jiang Z, Veiko V.P, Duan J, Ultrafast laser welding of transparent materials: from principles to applications, Int J Extrem Manuf. 2025; 7: 1-46.
[16] Elsheikh A, Omer M.A.E, Basem A, Faqeha H, Alsaati A.A, Thangaraj M, Essa F.A, Shanmugan S, Ramesh B, Sathyamurthy R, Ma N, Recent advances and future prospects of laser welding technology for polymeric materials: a review, J Mater Res Technol. 2024; 35: 7417-7440.
[17] Wang Z, Gao M, Numerical simulations of oscillating laser welding: a review, J Manuf Process. 2024; 119: 744-757.
[18] Bahrami M, Balajaddeh A, Naffakh-Moosavy H, Pulsed Nd: YAG laser welding of 17-4 PH stainless steel: microstructure, mechanical properties, and weldability investigation. Opt Laser Technol. 2019; 119:105651.
 [19] Ventrella V.A, Berretta J.R, Rossi W.D, Pulsed Nd: YAG laser seam welding of AISI 316L stainless steel thin foils, J Mater Process Technol. 2010; 210: 1838-1843.
[20] Baghjari S.H, Gholambargani M, Akbari Mousavi S.A.A, Application of pulsed Nd: YAG laser welding to investigate the effect of laser beam position on weld characteristics of AISI 420 stainless steel to Kovar alloy, Lasers Manuf Mater Process. 2019; 6(4).
[21] Deepak J.R, Anirudh R.P, Saran Sundar S, Applications of lasers in industries and laser welding: a review, 2023.
[22] Kurc-Lisiecka A, Lisiecki A, Laser welding of stainless steel, Achiev Mater Manuf Eng. 2020; 98: 32- 40.
[23] Landowski M, Influence of parameters of laser beam welding on the structure of 2205 duplex stainless steel, Biul Inst Spawalnictwa. 2019; 63(5): 21-31.
[24] Lisiecki A, Kurc-Lisiecka A, Automated laser welding of AISI 304 stainless steel by disk laser, Arch Metall Mater. 2018; 63: 1663-1672.
[25] Quintino L, Costa A, Miranda R, Yapp D, Kumar V, Kong C.J, Welding with high-power fiber lasers: a preliminary study, Mater Des. 2007; 28: 1231-1237.
 [26] Kou S, Welding metallurgy, 2nd ed. Hoboken (NJ): John Wiley & Sons. 2003.
[27] Duley W.W, Laser processing and analysis of materials, New York (NY): Plenum Press. 1983.
[28] ASTM International. ASTM E8/E8M-00. Standard test methods for tension testing of metallic materials. West Conshohocken (PA): ASTM International; 2000.
 [29] ASTM International. ASTM E92. Standard test methods for Vickers hardness and Knoop hardness of metallic materials. West Conshohocken (PA): ASTM International.
[30] ASTM International. ASTM E23. Standard test methods for notched bar impact testing of metallic materials. West Conshohocken (PA): ASTM International.
 [31] Liu W, Ma J, Atabaki M.M, Pillai R, Kumar B, Vasudevan U, Sreshta H, Kovacevic R, Hybrid laser-arc welding of 17-4 PH martensitic stainless steel, Lasers Manuf Mater Process. 2015; 2: 74-90.
 [32] Sadeghi B, Sharifi H, Rafiei M, Abbasian A.R, Saebnoor E, Microstructural, mechanical and corrosion properties of dissimilar joint between AISI 321 stainless steel and ASTM A537 CL1 structural steel produced by GTAW process, Metall Res Technol. 2019; 116: 110.
 [33] Kawahito Y, Mizutani M, Katayama S, Elucidation of high-power fibre laser welding phenomena of stainless steel and effect of factors on weld geometry, J Phys D Appl Phys. 2007; 40.
[34] Molian P.A, Solidification behaviour of laser welded stainless steel, J Mater Sci Lett. 1985; 4: 281-283.
[35] Quan Y.J, Chen Z.H, Gong X.S, Yu Z.H, Effects of heat input on microstructure and tensile properties of laser welded magnesium alloy AZ31, Mater Charact. 2008; 59: 1491-1497.
[36] Mirakhorli F, Malek Ghaini F, Torkamany M.J, Development of weld metal microstructures in pulsed laser welding of duplex stainless steel, J Mater Eng Perform. 2012; 21: 2166-2173.