Effect of vanadium addition on the creep resistance of 18Cr9Ni3CuNbN austenitic stainless heat resistant steel
- Effect of vanadium addition on the creep resistance of 18Cr9Ni3CuNbN austenitic stainless heat resistant steel
- 박대범; 허무영; 정우상; 서진유; 심재혁; 이승철
- austenitic stainless steel; Z-phase; creep strength
- Issue Date
- Journal of alloys and compounds
- VOL 574, 532-538
- The effect of vanadium addition on the creep property of niobium-containing 18Cr–9Ni austenitic
heat-resistant steel was studied. After solution treatment, the MX precipitates of vanadium-free steel
contained Nb only. On the contrary, high Nb and low V contents were detected from the MX precipitates
in the steel with 0.3 wt% of vanadium. Vanadium-rich MX carbo-nitride was not observed in the matrix
and at the grain boundaries after solution treatment. The vanadium precipitated as a form of Z-phase during
early-stage creep deformation was attributed to the improvement in creep strength at 700 ℃ with
applied stress higher than 150 MPa. And metallic Cu precipitates were confirmed in the nanometer scale
using TEM and EDS technique. The Cu precipitates are believed to contribute to the strengthening of
austenitic heat resistant steel independently. The precipitation behavior is discussed using transmission
electron microscopy and thermo-kinetics simulation technique.
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