The negative effect of Zr addition on the high temperature strength in alumina-forming austenitic stainless steels
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- 作者：Joonoh Moon ; Min-Ho Jang ; Jun-Yun Kang ; Tae-Ho Lee
- 关键词：Alumina-forming austenitic stainless steel (AFA) ; Zirconium (Zr) ; Precipitation ; Orowan strengthening mechanism ; Complex particle
- 刊名：Materials Characterization
- 出版年：January, 2014
- 年：2014
- 卷：87
- 期：Complete
- 页码：12-18
- 全文大小：1321 K
文摘
The effect of a Zr addition on the precipitation behavior and mechanical properties in Nb-containing alumina-forming austenitic (AFA) stainless steels was investigated using tensile tests, scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) analysis. The TEM observation showed that a Zr addition led to the formation of a (Nb,Zr)(C,N) complex particle, which coarsened the Nb-rich carbonitride. Tensile tests were performed at an elevated temperature (700 掳C), and both the tensile and yield strengths decreased with a Zr addition. This unexpected result of a Zr addition was due to the reduction of the precipitation strengthening by particle coarsening.