Analysis of Creep Behavior of Welded Joints of P91 Steel at 600°C

ISBN-13: 9786200008947 / Angielski

Osama Eldesoky

Opis

The P91 steel (9Cr-1Mo-V-Nb) has been developed for ultra-supercritical pressure application in steam power plants. The creep strength of the welded joint of this steel is limited by the fine-grained region of its heat affected zone. The factors which result in the reduction of the creep strength were discussed. It was found that the most effective factor reducing the creep rupture strength of the fine-grained region of the HAZ of the welded joint of P91 steel, in comparison with other regions of the welded joint, is the finer prior austenite grain size. These fine prior austenite grains of the fine-grained region of the HAZ accelerate the rate of growth of martensite lath subgrains which results in a softer martensite matrix. The minimum creep rate dependence on applied stress for base metal, welded joints and the samples simulating the fine-grained region of the welded joints was described by means of the conventional power-law equation. The experimental results, both in the form of strain versus time creep curves and of minimum creep rate versus time creep curves, were used to study the creep behavior of the welded joints of P91 steel at 600°C.

O autorze

Eldesoky, Osama
The author`s academic background is metallurgical engineering. He has a master degree in metallurgical engineering from Cairo university and postgraduate higher diploma in quality management from the American university in Cairo. His experience scope on quality management and material integrity systems.