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Small Punch Test on Jominy Bars for High-Throughput Characterization of Quenched and Tempered Steel

Studying the effect of quench and tempering heat treatments on steel, more specifically screening the effect of the austenitizing, quenching, and tempering conditions on mechanical properties, can be extremely material- and time-consuming when standard tensile testing specimens are employed. Jominy bar end quench testing has been used as a standard method to reduce the resources that are required for this type of screening. Jominy bar testing by itself shows, though, the limitation of yielding only hardness and microstructure as a result. In the last few years, the small punch test (SPT) standard has been developed. This technique can obtain an estimation of tensile mechanical properties with miniaturized specimens, which can be dissected from Jominy bars. The paper proposes a new testing methodology for screening the outcome of heat treatment conditions by combining the Jominy bar testing and SPT. Quench and tempering of API 5L X65Q pipe steel is used as a case study to describe the proposed methodology. The ability of the Jominy with SPT to detect variations in the mechanical properties produced by heat treatments is shown. This methodology can be directly applied as a high-throughput testing approach in the optimization of heat treatments.

Autoreak:

Ibon Miguel, Itziar Berriozabalgoitia, Garikoitz Artola, Luis María Macareno (UPV/EHU), Carlos Angulo (UPV/EHU)

Keyword-ak:

small punch test; quenched and tempered steel; Jominy test; heat treatment; mechanical properties; high-throughput testing

 

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