P元素对GH4738合金高温性能影响的机理
doaj(2025)
Abstract
以不同P元素含量的GH4738合金为研究对象,利用扫描电镜、透射电镜、EBSD技术以及分子动力学模拟研究高温持久载荷下不同P含量对GH4738合金持久性能的影响机理.持久实验表明,P添加量从 0.004%(质量分数,下同)增加至 0.0091%时,合金的持久寿命增加;继续添加P元素,合金持久性能下降.微观分析及分子动力学模拟结果表明,P倾向偏聚于晶界,可以增加晶界的内聚力及结合能,同时与晶界碳化物共同影响GH4738合金的持久性能.P元素含量从 0.004%增加至 0.0091%时,晶界析出的M23C6 碳化物由少量且离散分布的状态逐渐增加并呈不连续链状分布,持久变形时晶界碳化物对位错的钉扎作用增强,能有效地抑制位错运动,此时合金的持久性能较高.但当P含量进一步增加至0.019%时,晶界M23C6 碳化物有连接成片的趋势,合金持久性能降低.
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Key words
element P,GH4738 alloy,stress rupture property
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