Norhafzan, Bariman and Syarifah Nur Aqida, Syed Ahmad and Izwan, Ismail and Khairil, Che Mat (2024) Thermal stability of laser modified die insert surface in hot press forming of 22MnB5. Jurnal Tribologi, 43. pp. 86-103. ISSN 2289-7232. (Published)
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Abstract
Laser surface modification enhanced steel hardness properties from refined grain structure. Despite its superior properties, the thermal stability of fine grain structure is questionable as its metastable phase. This study investigates laser-modified die insert surface in hot press forming (HPF) of 22MnB5 steel blanks. The modified die insert was characterised for surface integrity, metallographic study, and thermal stability. From the findings, the laser-modified die inserts surface exhibits a thickness range between 0.10 and 0.33 mm with a refined grain structure of 1.02 µm, and respective surface roughness and subsurface hardness of 1.89-3.89 µm and 684.4-793.7 HV0.1. The blanks that formed using laser-modified die inserts exhibit a higher martensite structure of 74.8-80.6% with an average hardness of 508.1 HV0.1, while the high-strength steel blanks formed using the as-received surface inserts consist of 58.7 % martensite structure with 386.6 HV0.1 hardness. Correlating the thermal stability of laser modified surface, the refined grain structure in laser modified die inserts surface was retained during the HPF process though the die insert surface was exposed to heated blank at temperatures above 600 °C. These findings are significant to design HPF die inserts surface for a prolonged lifecycle.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Laser modified surface; Die insert; Hot press forming; Temperature history; Martensite |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Faculty/Division: | Faculty of Manufacturing and Mechatronic Engineering Technology Faculty of Mechanical and Automotive Engineering Technology |
| Depositing User: | Dr Syarifah Nur Aqida Syed Ahmad |
| Date Deposited: | 13 Jan 2025 01:41 |
| Last Modified: | 13 Jan 2025 01:41 |
| URI: | http://umpir.ump.edu.my/id/eprint/43521 |
| Download Statistic: | View Download Statistics |
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