Abstract
-The influence of exploitation period and temperature on the fatigue crack growth parameters indifferent regions of a welded joint is analysed for new and exploited low-alloyed Cr-Mo steel A-387 Gr. B. Theparent metal is a part of a reactor mantle which was exploited for over 40 years, and recently replaced with newmaterial. Fatigue crack growth parameters, threshold value Kth, coefficient C and exponent m, have beendetermined, both at room and exploitation temperature. Based on testing results, fatigue crack growth resistancein different regions of welded joint is analysed in order to justify the selected welding procedure specification
Highlights
The reactor analysed here has a form of a vertical pressure vessel with a cylindrical mantle and two welded lids, made of Cr-Mo steel A-387 Gr
Fatigue crack growth resistance in different regions of welded joint is analysed in order to justify the selected welding procedure specification
The high-frequency resonant pulsator was used, in force control mode, with loading ratio R = 0.1 to obtain diagrams da/dN- K for specimens with fatigue crack tip located in parent metal (PM), weld metal (WM) and
Summary
The reactor analysed here has a form of a vertical pressure vessel with a cylindrical mantle and two welded lids, made of Cr-Mo steel A-387 Gr. B, [1]. Long-time, high temperature exploitation of the reactor, caused siginficant damage in reactor mantle, requiring a thorough inspection and repair of damaged parts, including replacement of a part of reactor mantle. For designed exploitation parameters (p=35 bar, t=537 °C), the material is prone to decarbonization, reducing its strength as a consequence, [2]. Testing of high-cycle fatigue behaviour of new and exploited parent metal (PM), weld metal (WM) and heat affected zone (HAZ), at room and service temperature (540 °C) is necessary to get detailed insight in all parameters influencing fatigue crack growth resistance of Cr-Mo steel A-387 Gr. B. welded joints.
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