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Study on the Microstructure Evolution and Tungsten Content Optimization of 9Cr-3W-3Co Steel
Longteng Ma1, Yanfeng Wang2, Guobiao Di3
1Shougang Research Institute of Technology, Beijing 100043, China. malongteng@gmail.com.
Abstract:
Creep rupture tests of 9Cr-3W-3Co steel were conducted in the range of 120 to 200 MPa at 650 °C. The influence of stress on microstructure evolution was investigated in detail. In the high stress regime, a large density of dislocation was generated and induced precipitation of fine and dispersive particles. However, at lower stresses, a transformation from martensite laths to large size subgrains and a coarsening of precipitates took place due to significant recovery and loss of pinning effect during long term exposure. Thermodynamic results revealed decreasing tungsten content effectively retarded the coarsening behavior of M23C₆ and Laves phase, hence further improvement of creep rupture time was achieved experimentally.
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