杜沛南,刘烨,肖文卓,杨思敏,陈旭,贺双,章林

• 1:中国核动力研究设计院
• 2:核反应堆技术全国重点实验室
• 3:国家能源先进核燃料元件研发(实验)中心
• 4:湘潭大学材料科学与工程学院

摘要(Abstract)：

氧化物弥散强化(ODS)铁素体合金因其优异的高温强度和抗蠕变性能，被广泛应用于核能及高温结构应用中。在高温热变形过程中，ODS铁素体合金中的纳米氧化物颗粒具有优异的高温稳定性，使得其在高温下仍能保持较高的强度。然而，较低的塑性使得ODS合金容易在热变形过程中形成裂纹等缺陷。因此，研究其热变形行为对开发高性能铁素体基合金具有重要的科学意义。通过热模拟实验，研究了机械合金化制备的ODS铁素体合金在不同变形温度(500、600、650和700℃)和应变速率(0.001、0.01和0.1 s~(-1))下的热变形特性。基于不同变形条件下获得的峰值应力，计算了合金的热变形激活能，构建了其本构方程，并使用动态材料模型(DMM)绘制了其在不同应变(0.2、0.3、0.4、0.5)及峰值应力下的热加工图。结果表明：合金适宜的热变形区间主要集中在高于580℃的低应变速率区域，在此区域选择合适的变形温度和应变速率能使基体发生动态再结晶并避免晶粒过分长大，可有效避免热加工过程中缺陷的产生，从而获得性能更优的热变形产品。

关键词(KeyWords)： 铁素体基合金;共沉淀强化;氧化物弥散强化;热变形行为

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52103363,52074032,52474387,52374366,52101152);; 中核集团青年英才项目(NPIC-Z3022024003);; 江西省“双千项目”(203075000041)

作者(Author): 杜沛南,刘烨,肖文卓,杨思敏,陈旭,贺双,章林

DOI: 10.13289/j.issn.1009-6264.2024-0598

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