Investigation on a creep-tested CB2 steel cross-weld sample welded with a matching flux-cored wire

Baumgartner, Susanne; Pahr, Hannes; Zauchner, T.

doi:10.1007/s40194-018-0574-x

Cited by 3 publications

(1 citation statement)

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“…In recent years, ultra-supercritical thermal power units with improved thermal efficiency have been attracting increasing interest in many countries, in order to reduce the emission of CO 2 and hazardous gases [1][2][3]. Ultra-supercritical thermal power units require castings to work in conditions of 30 MPa/600 • C or even higher pressures and temperatures for long durations.…”

Section: Introductionmentioning

confidence: 99%

Thermal Simulation Study on the Solidification Structure and Segregation of a Heavy Heat-Resistant Steel Casting

Wang

Zhong

et al. 2019

Metals

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The prediction and controlling of the solidification structure and macro-segregation in heavy steel casting, which is usually produced in limited quantities, was a conundrum in the foundry field. In this work, the cooling and solidification processes of a 16 t CB2 ferritic heat-resistant steel (FHRS) valve casting were reproduced by studying the solidification behavior of three typical units through a thermal simulation method. The results indicate that the types of casting without chilling have the most uneven distribution of solutes and hardness, while those types of casting in which parts are solidified by chilling are much more uniform. The macro-segregation degrees of B, C, Nb, P, Cr, Mo, Si, V and Mn decrease gradually during heavy casting of CB2 ferritic heat-resistant steel. Of them, B, C, Nb, and P are solutes prone to segregation, and the maximum macro-segregation index of B can even reach 15. The macro-segregation tendencies of Cr, Mo, Si, V, and Mn are relatively small. Further studies on the last solidification portion of samples taken by electron microprobe reveal that large-sized precipitates such as MnS and NbxC are easily formed due to solute enrichment, and the sizes of these precipitates were distributed from dozens to hundreds of micrometers.

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Section: Introductionmentioning

confidence: 99%