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摘要
Oxide dispersion strengthened (ODS) steel has excellent radiation properties and is considered a candidate for the first wall structure of fusion reactors. Adding Y element to the material can improve thermal stability, and Cr element can improve corrosion resistance, because the high oxide density inside will cause needle-like dislocations, the material has higher strength and lower toughness to brittle transition temperature. The nano-precipitation phase can trap helium and make it in the form of nano-scale helium bubbles, avoiding the production of large helium bubbles to reduce possibility of expansion. Reducing helium embrittlement can make the material have a longer service life in the fusion reactor. In this work, based on mechanical alloying (MA) and spark plasma sintering (SPS), binary alloys with Fe(9~11)Cr content and ODS alloys were prepared successfully. The morphology and phase analysis of MA powders were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), micro Vickers-hardness tester and energy dispersive spectrum (EDS), and the precipitation phase of the alloy sample was observed by transmission electron microscope (TEM). The results showed that the fine grain size enabled the material to have good tensile and creep properties at high temperatures. The MA powder was continuously refined after being crushed and deformed under a rotational speed of 300 r/min and the ball-to-powder mass ratio was 10:1. The MA powder reached the cold welding-crushing balance at 40 h. The powder grain size decreased to about 16.1 nm and tended to be stable with the increase of ball grinding time. After spark plasma sintering and solidification of the MA powder for 40 h, the grain size did not increase significantly, and the trace elements were uniformly distributed in the matrix. The Vickers-hardness of binary alloy samples increased with the addition of Cr content. The grain boundaries of ODS alloy samples proved to be fine and uniform after being eroded by corrosive liquid. ? 2021, China Science Publishing & Media Ltd. All right reserved.
- 出版日期2021
- 单位合肥工业大学
