Fracture Characterization of Steels by Means of the Small Punch Test

摘要: A hot rolled API X-70 steel plate and its heat-affected zone (the region with the maximum hardness lowest toughness of welded joint made using this steel) were employed to obtain material’s room temperature elasto-plastic fracture toughness, JIc, by means small punch tests (SPTs) both conventional un-notched samples longitudinally-notched SPT specimens. In latter case, notches manufactured micromachining different notch depth-to-thickness ratios (a/t = 0.3 0.4). The representative parameter used was strain measured directly in failed region, while case notched samples, consumed energy until initiation a crack from tip considered most useful choice. onset determined load-displacement plot each test aid scanning electron microscope observations performed on over which interrupted had been conducted. These at percentages registered load. simple correlation between growth sample critical J value obtained standard (J-R curves) determined, defining an easy promising way derive miniature tests.