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通过热处理及表面机械强化处理在表层获得残余压应力,可提高疲劳及多冲性能。本文给出了下列结果: 1.选择低淬透性的中碳钢整体加热后剧烈冷却,可在表层获得很高的残余压应力,此种薄壳淬火的另件能显著提高疲劳强度,表面最大压应力的含碳量约在0.5到0.6%C左右。 2.渗碳的另件在表层马氏体点以上等温淬火,使心部先变成马氏体,在随后冷却过程中,表层发生马氏体转变,可保存很大的残余压应力,淬火的缺口多冲弯曲破断次数比普通淬火者要高2—4倍。 3.碳氮共渗后,若在表层的一定深度内出现黑色组织,则此层为残余张应力,使多冲性能大幅度下降。 4.滚压及喷丸强化是提高表层残余压应力的有效手段,可以提高多冲接触疲劳及弯曲疲劳寿命。
Through the heat treatment and surface mechanical strengthening treatment in the surface to obtain residual compressive stress, can improve fatigue and multi-red performance. This paper gives the following results: 1. Select the low-hardenability of carbon steel after heating the whole intense cooling, the surface layer can be obtained in the high residual compressive stress, this kind of shell quenched other components can significantly improve the fatigue strength, the surface The maximum compressive stress carbon content of about 0.5 to 0.6% C or so. 2. Carburizing another piece of martensite in the surface above the point of austempering, so that the Ministry of the heart into martensite, followed by cooling, the surface martensite transformation can save a lot of residual compressive stress, quenching The number of gaps punching more than the average quenching 2-4 times higher. 3. After carbonitriding, if the surface of a certain depth of the black tissue, then this layer is the residual tensile stress, so that the performance of a substantial decrease in red. 4. Rolling and shot peening is to improve the surface residual compressive stress is an effective means to improve multi-impact contact fatigue and bending fatigue life.