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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μ和Mo6C相,1120℃×1 h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6 min,Mo6C相即可析出。
The precipitation phase and precipitation kinetics of a novel Ni-Cr-Mo high-strength corrosion-resistant alloy were investigated by means of thermodynamic calculation, scanning electron microscope observation and chemical phase analysis. The results show that the precipitation phase of the alloy under the standard heat treatment state mainly consists of the aggregated distribution of the particles of μ and Mo6C phases. After the solution treatment at 1120 ℃ for 1 h, all the precipitates in the alloy are all dissolved back into the matrix. The solid solution test alloy isothermally aged in the temperature range of 600 ~ 1050 ℃, the Mo6C phase will be precipitated in the grain boundary and in the grain. With the increase of aging temperature, the precipitation rate of Mo6C phase is accelerated. In the temperature range from 800 ℃ to 1050 ℃, the aging time is only 6 min, and Mo6C phase can precipitate.