Microstructure and stress rupture property of titanium-containing 11Cr ferritic/martensitic steels
- Microstructure and stress rupture property of titanium-containing 11Cr ferritic/martensitic steels
- Feng-Shi Yin; 정우상
- Creep; Heat resistant steel; MX; Precipitation strengthening; Titanium carbide
- Issue Date
- Journal of materials processing technology
- VOL 209, NO 1, 181-185
- The microstructure and stress rupture behavior of 11Cr ferritic/martensitic steels with
0.02 wt.%Ti (low Ti) and 0.14 wt.%Ti (high Ti) have been studied. The steels are prepared
by vacuum induction melting followed by hot forging and rolling into plates. The results
show that titanium is easy to combine with oxygen and other elements to form complex
inclusions. Large MX particles with 1–3 ㎛ are found in the high titanium steel. Most of the
large MX particles have a TiO2 cored structure. After normalizing at 1100 ℃ for 1h, cooled
in air and tempering at 750 ℃ for 1h, nano-sized MX precipitates distribute densely near
martenstic lath boundaries in the high titanium steel. The large MX particles cannot be dissolved
even at austenitizing temperature up to 1300 ℃. Creep cracks nucleate at the interface
between matrixes and the large MX particles or titanium-containing oxide inclusions.
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