Microstructure of Stainless Steel Composite Pipe Pruduced by SHS-Centrifugal Process
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摘要: 用掃描電鏡和透射電鏡研究了自蔓延離心法制備的不銹鋼內襯(Cr,Ni分別為13%~14%和14~16%)復合鋼管不銹鋼層的結晶特點和組織結構.研究表明,不銹鋼熔體主要以柱狀晶形式結晶,柱狀晶由奧氏體組成,柱狀晶間有一薄層鐵素體,鐵素體區有AlNi金屬間化合物析出相,在奧氏體和鐵素體相界的鐵素體區一側有σ相析出.Abstract: The microstructure and solidification behaviour of stainless steel layer in composite pipe were investigated by means of TEM and SEM. The results show that the crystal of stainless steel layer grows in columnar grains. The columnar grains consists of austenite. A thin layer of ferrite exists between the columnar grains. The intermetallic compound AINi precipitates in ferrite zone. The σ phase precipitates at the phase boundaries between austenite and ferrite.
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Key words:
- stainless steels /
- steel pipe /
- microstructure /
- combustion synthesis
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