1.Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China；Graduate School of Chinese
Academy of Sciences, Beijing 100049, China; 2.Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China; 3.Metals Research Group,
School of Planning, Architecture & Civil Engineering, Queen’s
University of Belfast, Belfast BT9 5AG, UK; 4.Sente Software Ltd.,
Surrey Technology Centre, Guildford GY2 7YG, UK;
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History+
Published Online
2009-12-05
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(539KB)
Abstract
The Laves phase is one of the most significant precipitates in ferritic/martensitic heat-resistant steels. Laves phase precipitates in the creep rupture specimens with different rupture life were studied on a 10 wt.% Cr heat-resistant steel. JMatPro thermodynamic and kinetic calculations were carried out to simulate and predict the precipitation behavior of the Laves phase in the steel at the equilibrium state. The morphologies of the Laves phase developed with creep time were characterized under both scanning electron microscope (SEM) and transmission electron microscope (TEM). Effects of Co on the growth behavior of Laves phase and the corresponding fracture mode were analyzed. It was found that the Laves phase in the steel grew to 200 nm in size after only 1598 h at 600°C, indicating that the addition of Co in the steel could accelerate the growth of Laves phase, and the coalescence of large Laves phase would lead to the brittle intergranular fracture.
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