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采用透射、X射线及显微硬度分析等方法,研究了TC21合金中淬火马氏体在长时间低温时效过程中的组织演变及马氏体分解机制。研究表明,淬火态TC21合金在400～450℃进行长时间等温处理后,易获得弥散分布的颗粒状α相,显著提高合金性能,而α相颗粒的形核与马氏体中层错的分布密切相关。正交马氏体在低温时效过程中的具体分解方式为α→α+α富→α+β亚稳→α+β。进一步提高时效温度或时效时间α相颗粒将粗化为片层状,降低合金强度。
The microstructure evolution and martensite decomposition mechanism of quenched martensite in TC21 alloy during aging at low temperature were studied by transmission, X-ray and microhardness analysis. The results show that the TC21 alloy quenched at 400-450 ℃ for a long time after isothermal treatment, easy to obtain the dispersed phase of granular α, significantly improve the performance of the alloy, and α-phase grain nucleation and martensitic distribution of intermediate faults close Related. The specific decomposition of orthogonal martensite during aging at low temperature is α → α + α rich → α + β metastable → α + β. To further improve the aging temperature or aging time α-phase particles will be roughened into lamellae, reducing the alloy strength.