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随着工业技术的发展,人们发现通过一次淬火和时效处理,不能在时效硬化合金中得到最佳的性能,而进行分级或多级时效能得到满意的性能,因此,发展了分级时效。随着合金强韧化工艺的发展及第二相粒子对合金性能影响的深入研究,分级时效不仅应用于有脱溶沉淀机制的有色金属中,在有脱溶沉淀机制的黑色金属中亦得到相当的发展,而且在有Spinodal分解的合金中,亦采用分级时效改善了合金的性能。近几年发展的分级时效与形变热处理相结合,使合金的性能得到进一步的提高。因此,分级时效的使用范围正在日益扩大,
With the development of industrial technology, it has been found that by quenching and aging treatment, the best performance can not be obtained in the age-hardenable alloy, and satisfactory performance in grading or multi-stage aging can be obtained. Therefore, the classification aging has been developed. With the development of toughening technology and the effect of second phase particles on the properties of alloys, the classification aging is not only applied to the nonferrous metals with the mechanism of desolventizing, but also to the ferrous metals with the mechanism of desolventizing Development, but also in Spinodal decomposition of the alloy, also used to improve the performance of the alloy aging. In recent years, the development of graded aging and heat treatment combined with deformation, the performance of the alloy has been further improved. Therefore, the use of grading aging is expanding,