董武梅,乐国敏,何培,罗晋如,刘学,李晋锋,王海波,何东,张政

• 1:北方工业大学机械与材料工程学院
• 2:中国工程物理研究院材料研究所

摘要(Abstract)：

采用增材制造方法分别在600、800和1000 W激光功率下直接熔化沉积制备FeCrWYAl系ODS不锈钢单壁件,研究了激光功率对ODS不锈钢件微观组织和性能的影响,以期获得相对更好的激光功率参数;并在该激光功率下,分别制备了FeCrWY和FeCrWAl合金单壁对比件,讨论微合金元素Al和Y对激光熔化沉积单壁件显微组织的影响。采用扫描电镜(SEM)和能谱(EDS)等对开裂单壁件的断口组织进行表征和分析,讨论了其断裂机制,并采用维氏硬度计测量了合金的显微硬度。结果表明:随着激光功率的提高,合金试样的组织更粗大、开裂更严重;合金元素Y和Al的添加使得合金开裂更严重,合金试样的开裂与凝固末期产生的结晶裂纹有关,为热致裂纹。断口组织分析表明,合金试样平行沉积方向为沿晶开裂,晶界处的氧元素偏析及细小的钨的碳化物相所导致的柱状晶晶界弱化可能是合金试样沿沉积方向贯穿开裂的重要原因之一。随着激光功率的下降,合金试样的硬度下降,但组织较为均匀;不同功率制备的FeCrWYAl和FeCrWAl样品组织均为单相铁素体组织,而600 W制备获得的FeCrWY样品组织为铁素体/马氏体双相组织。

关键词(KeyWords)： ODS不锈钢;激光熔化沉积;激光功率;微观组织;热致开裂

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2017YFB0702400);; 国家自然科学基金面上项目(51871203);国家自然科学基金青年项目(51801190)

作者(Author): 董武梅,乐国敏,何培,罗晋如,刘学,李晋锋,王海波,何东,张政

DOI: 10.13289/j.issn.1009-6264.2019-0201

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