کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1577320 | 1514801 | 2012 | 7 صفحه PDF | دانلود رایگان |
Equal channel angular pressing was used to refine the microstructure of a Fe–14Cr–16Ni (wt.%) alloy. The as-processed alloy had predominantly equiaxed austenite fine grains with an average grain size of 0.4 μm and a low fraction of deformation induced martensite. Ex situ isothermal annealing experiments showed the fine microstructure was thermally stable up to 673 K, and abnormal grain growth occurred at ∼873 K. In situ annealing studies in a transmission electron microscope revealed the coarsening of grains. Analysis of grain growth kinetics from 873 to 1073 K yielded average activation energy of grain growth to be ∼207 kJ/mol. The grain growth mechanisms and annealing induced evolution of mechanical properties were discussed.
► Ultrafine grained Fe–Cr–Ni alloy was processed by equal channel angular pressing.
► The ultrafine microstructure and microhardness were thermally stable up to 673 K.
► Abnormal grain growth occurred at ∼873 K.
► Activation energy of grain growth from 873 K to 1073 K was ∼207 kJ/mol.
Journal: Materials Science and Engineering: A - Volume 542, 30 April 2012, Pages 64–70