Habib SAHLAOUI
@ensit.tn
Mechanical Engineering - National Higher Engineering School of Tunis (ENSIT)
University of Tunis (UT) - Ministry of Higher Education - Tunisia
RESEARCH INTERESTS
Microstructure evolution; Aging Material; Relationship microstructure-mechanical properties; Corrosion; Modeling; Nanocomposite; Additive manufacturing.
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Thabet A. M. Sghaier, Habib Sahlaoui, Tarek Mabrouki, Haifa Sallem, and Joël Rech
Springer Science and Business Media LLC
AbstractThis study provides a comprehensive benchmark comparison of microstructure, mechanical properties, and their evolution during subsequent heat treatment of 17-4PH Martensitic stainless steel (MSS) processed by laser powder bed fusion (LPBF) and its commercially rolled counterparts. The results reveal that LPBF samples exhibit a finer martensitic microstructure with presence of structural defects, pores, and some non-metallic inclusions randomly distributed at the grain boundaries and within the grains and an almost absence of austenite, compared to rolled samples. Additionally, after identical heat treatment, LPBF samples maintain a relatively unchanged microstructure while aging of rolled samples leads to a reduction in martensite in favor of austenite and Cu- and Si-rich precipitates. The LPBF samples demonstrate slightly elevated hardness (HV0.5 + 20%), mechanical strength (UTS + 15%) compared to rolled ones. Nevertheless, LPBF samples display a distinct behavior, characterized by abrupt fracture and reduced elongation at failure (El% max. 4% vs. 17.5%). Specifically, failure in LPBF samples is attributed to cleavage and cavities’ coalescence contrasting with the progressive failure mechanism observed in rolling ones driven by plasticity and damage evolution. Furthermore, the impact resistance of LPBF samples is notably weak (K max. 12.5 J/cm2 vs. 155 J/cm2), which is likely caused by macro- and microstructural defects generated by the LPBF process and the nucleation of harmful precipitates. The study proposes that the ductility of LPBF samples could be improved by implementing appropriate heat treatment and reducing defects through parameter optimization and by specific thermal cycle control during the LPBF process.
Atef Chokri, Amir Ben Rhouma, and Habib Sahlaoui
Springer Nature Switzerland
Thabet A. M. Sghaier, Habib Sahlaoui, Tarek Mabrouki, Haifa Sallem, and Joël Rech
Springer Nature Switzerland
Thabet A. M. Sghaier, Habib Sahlaoui, Haifa Sallem, Tarek Mabrouki, and Joël Rech
Springer Nature Switzerland
Thabet A. M. Sghaier, Habib Sahlaoui, Tarek Mabrouki, Haifa Sallem, and Joël Rech
Springer Science and Business Media LLC
Habib Sahlaoui, Mohamed Guedri, and Habib Sidhom
Springer Science and Business Media LLC
Habib Sahlaoui and Habib Sidhom
Springer Science and Business Media LLC
Habib Sahlaoui, Kamel Makhlouf, and Habib Sidhom
Hindawi Limited
The effect of the glazed layer and firing conditions (temperature and duration) on the thermal shocks behavior of tableware porcelains has been studied. Two types of glazed layers and three firing conditions, used industrially in the commercial porcelains manufacture, are used in this investigation. Repeated thermal shock tests showed that the glazed layer with higher alumina/silica ratio is more resistant to thermal shocks and that the slow firing cycle, even at a relatively low temperature, is very beneficial for the thermal shock resistance of the porcelain matrix. Three-point bending tests showed that the crazing phenomenon, which affects the glazed layers as well as the porcelain matrix, does not affect significantly the mechanical resistance of these materials.
H. Sidhom, T. Amadou, H. Sahlaoui, and C. Braham
Springer Science and Business Media LLC
H Sahlaoui, K Makhlouf, H Sidhom, and J Philibert
Elsevier BV
H Sahlaoui, H Sidhom, and J Philibert
Elsevier BV