新型Ni-Cr-Mo高强耐蚀合金中的析出相及其析出动力学  

Precipitates and precipitation kinetics in a newly developed Ni-Cr-Mo alloy

作　　者：曾燕屏[1] 寇立忠[1] 谢锡善[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2013年第11期119-124,共6页Transactions of Materials and Heat Treatment

基　　金：美国海因斯国际公司(Haynes International Inc.;USA)为本研究提供试验材料和经费支持

摘　　要：采用热力学计算、扫描电镜观察和化学相分析等手段，对一种新型Ni-Cr-Mo高强耐蚀合金中的析出相及其析出动力学行为进行了研究。结果表明：标准热处理态下试验合金中的析出相主要为聚集分布的颗粒状斗和Mo6C相，1120℃×1h固溶处理后，合金中的所有析出相全部回溶进入基体。将固溶态的试验合金在600—1050℃的温度范围内等温时效，其晶界和晶内将析出Mo6C相。随着时效温度的升高，Mo6C相的析出速度加快，在800—1050℃的温度区间，时效仅6min，Mo6C相即可析出。The precipitates and precipitation kinetics in a new corrosion-resistant Ni-Cr-Mo alloy with high strength were investigated by means of thermodynamic calculation, SEM observation and chemical phase analysis. The results show that the main precipitates in this alloy under standard heat treatment condition are p, and M%C phases and they are dissolved into the matrix after solution treatment at 1120 ℃ for 1 h. The M%C phase precipitates again not only at grain boundaries but also in grains during aging at 600 -1050 ℃ and its time-temperature-transformation diagram is presented based on the microstructure analysis.

关 键 词：Ni-Cr-Mo合金 析出相 析出动力学 

分 类 号：TG133.4[一般工业技术—材料科学与工程]