Premature fracture of steam pipelines fromud14MoV6 3 steel designed for 1000,000 h serviceudlife at 540°C has been studied. Test specimens areudmanufactured from steel in the initial state and afterud117 h of operation. Application of the local approachudto fracture and the metallographic analysis,udin addition to classical methods (tensile, crack resistance,udand fatigue strength tests), provided audmore precise evaluation of steel properties degradationuddue to elevated temperatures and stresses.udUrgency of further development of the local approachudto predicting material fracture afterudlong-term operation at high temperatures has beenudsubstantiated.
展开▼
