Characterization of the fracture behaviour of X42 microalloyed pipeline steel

摘要: Purpose – The purpose of this paper is to investigate the fracture grade X42 microalloyed steel used as pipe material after tensile test at room temperature and impact tests 0, −20 −40°C, respectively. Design/methodology/approach In first stage study, steels in form sheet materials were selected etched samples characterized using light microscope. second stage, mechanical properties obtained by microhardness measurements, static all broken surfaces examined scanning electron microscope determine type a function both microstructure loading. Findings examinations revealed that: first, had typical ferritic-pearlitic matrix, second, transverse section exhibited matrix consisting polygonal ferrite-aligned pearlite colonies longitudinal one elongated ferrite phase direction r...