TY  - JOUR
T2  - Journal of Mining and Metallurgy, Section B: Metallurgy
TI  - A comparative study of mechanical behaviour of heat-treated 3D printed In-718 and ASTM F75 alloys across multiple length scales
VL  - 62
IS  - 1
SP  - 53
EP  - 67
PY  - 2026
DA  - 14 May 2026
DO  - 10.2298/JMMB251111005Z
UR  - https://doi.org/10.2298/JMMB251111005Z
AU  - Zubair, Muhammad
AU  - Nur, Khushnuda
AU  - Haq, Ehsan ul
AU  - Ahmed, Furqan
AU  - Javed, Muhammad Adil
AU  - Khan, Muhammad Junaid
AU  - Naveed, Muhammad Mubeen
AU  - Hassan, Mirza Mueed ul
AU  - Abdullah, Ahmed
AD  - a Department of Metallurgical and Materials Engineering, Faculty of Chemical, Metallurgical & Polymer Engineering, University of Engineering & Technology (UET), Lahore, Pakistan; b IMMESNA, Dubai, UAE;
AB  - The hardness and strength of many alloys often differ when measured at the nano, micro, and macroscopic scales. Therefore, it is essential to study the mechanical behavior of important alloys across a wide range of length scales. In this work, we present a scenario in which two industrially significant alloys, In-718 and ASTM F75, exhibit different behaviors at the micro and macroscopic levels. Both alloys are promising candidates for similar applications in the aerospace and petroleum industries. The alloys were first 3D printed using selective laser melting (SLM) and then heat-treated in a vacuum. The average yield strength and percentage elongation (along the build direction) of the In-718 alloy were 29% and 19% higher, respectively, than those observed for the ASTM F75 alloy. The difference between the ultimate tensile strength (UTS) and Vickers hardness (at a load of 98 N) was almost negligible, i.e., less than 5%. In contrast to the Vickers hardness values of 3.9 GPa and 3.8 GPa, the average nanohardness of the In-718 and ASTM F75 alloys was 5.7 GPa and 7.6 GPa, respectively, which was substantially higher than their Vickers hardness. Furthermore, the ASTM F75 alloy demonstrated much better wear resistance in ScanningWear tests performed using a nanoindenter. The explanation for these differences and the similarities between macro- and nanomechanical behavior are presented in this work.
KW  - Mechanical properties
KW  - Nanoindentation
KW  - Mechanical behavior
KW  - Alloys
N1  - Correspondence Address: Muhammad Zubair; Furqan Ahmed; Department of Metallurgical and Materials Engineering, Faculty of Chemical, Metallurgical & Polymer Engineering, University of Engineering & Technology (UET), Lahore, Pakistan; email: zubair@uet.edu.pk; furqan.ahmed@uet.edu.pk
N1  - J. Min. Metall. Sect. B-Metall., 62 (1) (2026) 53-67. doi:10.2298/JMMB251111005Z
PB  - Technical Faculty in Bor
SN  - 1450-5339 (ISSN)
LA  - English
J2  - J. Min. Metall. Sect. B Metall.
M3  - Article
ER  -