English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The evolution characteristics of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in three states – welded, post-weld heat-treated and creep states – during manufacturing and service were evaluated by calculations and observations using optical microscopy, scanning electron microscopy, transmission electron microscopy and X-ray diffraction spectrometry. The results showed that the second phase was  M  3 C in the as-welded state. The types and quantities of the precipitated phases increased greatly after post-weld heat treatment (PWHT), and  M  3 C,  M  2 C,  M  7 C 3 ,  M  23 C 6  and  MX  were the main precipitated phases. During PWHT, the amount of  M  7 C 3  decreased, the amounts of  M  23 C 6  and  MX  increased, and the sizes of the second phases increased. The precipitates coarsened after long-term creep, and  M  7 C 3 ,  M  6 C,  M  23 C 6 ,  M  2 C, and  MX  were the main precipitate phases in this state. The size of the  MX  phase remained relatively stable during long-term creep, which contributed greatly to the creep resistance.

Evolution of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in different heat treatment states

Evolution of the second phases in the weld seams of 2.25Cr-Mo-0.25 V steel in different heat treatment states