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本文研究了镍基铸造高温合金K17在真空、空气和热腐蚀环境中热暴露前后持久性能和高温拉伸性能的变化.结果表明,真空中热暴露对K17合金的持久寿命没有影响,但降低高温瞬时拉伸强度,提高持久塑性和高温瞬时拉伸塑性;空气和热腐蚀环境中热暴露明显降低持久性能和高温瞬时拉伸性能,其中尤以热腐蚀环境最严重,空气环境暴露造成晶界氧化并贫Cr,热腐蚀环境暴露引起晶界严重硫化,晶界两侧贫Cr富S,因而弱化晶界,降低性能.
In this paper, the long-term and high-temperature tensile properties of K17 superalloy K17 before and after heat exposure in vacuum, air and hot corrosive environments were studied.The results showed that the vacuum heat exposure had no effect on the longevity of K17 alloy, Instantaneous tensile strength to improve ductility and high temperature transient ductility; heat exposure in air and hot corrosive environments significantly reduces long-term performance and high-temperature instantaneous tensile properties, especially in hot corrosive environments that cause grain boundary oxidation And poor Cr, hot corrosive environment caused serious grain boundary sulfide, both sides of the grain boundary lean Cr rich S, thus weakening the grain boundaries, reducing performance.