ENGINEERING JOURNAL CHIANG MAI UNIVERSITY

Volume 26, No. 01, Month APRIL, Year 2019, Pages 158 - 168

Influence of stress concentration and temperature on mechanical properties and microstructure of high strength steels

Chalermpol Klayni and Pongsakorn Leetrakul

Abstract Download PDF

This research aimed to study the influence of stress concentration and temperature under tensile testing on mechanical properties and microstructure of JIS G3135 SPFC440 high strength steels. Tensile specimens, ASTM-E8 standard, were prepared into five different stress concentration patterns and the four different tensile tests temperature were 25°C, 200°C, 400°C, and 600°C. The results showed that the effect of stress concentration on the tensile strength of the material was significantly decreased. From testing at room temperature as a ductile fracture is a result of the microstructure investigation of fracture surface caused the dimples fracture comparing to the testing in high-temperature which loss ductility from heat.

Keywords

High strength steel, Stress concentration, Mechanical properties, Microstructure

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