Improvement of Stress-rupture Life for Modified-HR6W Austenitic Stainless Steel

Abstract

Abstract: Stress-rupture life of HR6W austenitic stainless steel modified with B and Mg additions was measured, and the microstructures were analyzed by optical microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy equipped with energy dispersive spectroscopy. The results indicated that the enhancement of the stress-rupture life was mainly due to the precipitation with B in the elemental form at the grain boundaries, and the improvement of the form of carbides at grain boundaries and the removal of O and S elements by addition of Mg. The micro-alloying elements have a beneficial effect on stress-rupture life of the modified-HR6W austenitic stainless steel at high temperature.

Key words: HR6W, Micro-alloying, Stress-rupture life, Microstructure

Shiyun Cui, Zixing Zhang, Yulai Xu, Jun Li, Xueshan Xiao, Changchun Zhu. Improvement of Stress-rupture Life for Modified-HR6W Austenitic Stainless Steel[J]. J Mater Sci Technol, 2011, 27(11): 1059-1064.

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Improvement of Stress-rupture Life for Modified-HR6W Austenitic Stainless Steel

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