研究了喷砂和机加工后DZ417G合金在热处理过程中的组织演化及其对拉伸、持久性能的影响.结果表明:喷砂和机加工后,DZ417G合金样品热处理后表面发生了再结晶.扫描电镜观察发现固溶处理样品中的再结晶晶粒呈等轴晶晶粒,而在时效处理后再结晶晶粒呈胞状形式生长.表层再结晶使室温拉伸强度有一定程度的降低,对高温拉伸强度影响不大.表面再结晶厚度在持久过程中增加.表层等轴晶再结晶组织使持久性能降低,二次胞状再结晶组织将导致持久性能的进一步降低.
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