摘要:

AbstractThe factors influencing absorption by Type 444 ferritic stainless steel of interstitial elements from gaseous environments deliberately contaminated with nitrogen and oxygen have been studied for induction melted weld simulations and actual tungsten inert gas welds. For weld simulations, nitrogen pick-up is limited by factors such as the formation of stable TiN surface films; induction melting is therefore considered unsatisfactory as a weld simulation for the purpose of studying gas absorption. It is found that titanium is consumed by both gaseous species, whereas niobium is not; dual stabilization is therefore recommended. Welds show greater nitrogen pick-up than simulations, the effect increasing with increasing heat input, while at the highest heat inputs the quantity absorbed exceeds predictions based on solubility equilibria. These effects are explained in terms of the enhanced gas transfer conditions that obtain and the dissociation of the gas that occurs in the welding arc.MST/416

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.5.386

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

摘要:

AbstractEnergy dispersive X-ray spectroscopy, X-ray diffraction, precipitate extraction, microhardness, and metallographic techniques have been used to determine the degree of solubility of beryllium in CuAl2, which was found to be in the range 0·8–2·07 wt-%. Beryllium in the alloy was found to concentrate in the precipitate phases.MST/542

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.5.394

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor

ISSN:0267-0836    

DOI:10.1179/mst.1987.3.5.396

出版商:Taylor&Francis    

年代:1987

数据来源: Taylor