固溶熱處理對一種鎳基耐蝕合金管析出相的影響

Effect by Solid Solution Treatment on Precipitate Phase in Corrosion-resistant Nickel-based Alloy Tube

摘要: 分析了一種鎳基耐蝕合金管在3種不同固溶溫度（1 020℃、1 080℃和1 130℃）條件下析出相的狀態(tài)特點。分析結果表明：該鎳基耐蝕合金經(jīng)過900℃退火處理2 h后晶界形成大量富含Cr、Mo的σ相；經(jīng)1 020℃固溶處理1 h后晶界σ相仍大量存在；在1 080℃固溶處理1 h則消除了大部分的σ相，但晶界還有少量殘余；而在1 130℃固溶處理1 h后則可完全消除析出相，為保證合金管耐蝕性提供了極佳組織條件。

Abstract: Studied here in the article are the status characteristics of the precipitate phases of a certain corrosionresistant nickel-based alloy tube as developed at three different solid solution temperatures，i.e.，1 020℃，1 080℃ and 1 130℃.The analysis result shows that a large number σ phases rich in Cr and Mo got formed in the grain boundary，after the said alloy is annealed at 900℃ for 2 hours.And after being solid solution treatment at 1 020℃ for 1 hour，grain boundary σ phase still remains in large quantity.Due to solid solution treatment at 1 080℃ for 1 hour，most of the σ phase is eliminated，but there still remains a small amount as residual in the grain boundary. Nevertheless，thanks to solid solution treatment at 1 130℃ for 1 hour，the residual precipitate phase is completely eliminated，thus provides excellent microstructure condition for assuring corrosion resistance of the alloy pipe.