王长浩,叶宏,沈大臣,汪砚青

• 1:重庆理工大学材料科学与工程学院
• 2:重庆市特种焊接材料与技术高校工程研究中心(重庆理工大学)

摘要(Abstract)：

采用选区激光熔化技术在20钢基体表面制备了Ni-Al合金层。研究了激光工艺参数对合金层宏观形貌的影响,确定了较优工艺参数。利用扫描电镜(SEM)、X射线衍射(XRD)、能谱仪(EDS)和HVS-1000硬度测试仪等研究了合金层的物相组成、组织形貌、成分分布和硬度。结果表明:在优化工艺参数下利用选区激光熔化技术可在20钢表面制备出组织致密、无明显缺陷且与基体具有良好冶金结合的Ni-Al合金层,合金层主要由Ni3Al和ɑ-Ni两相组成,表层为细小致密的等轴晶,合金层中部为柱状晶,底部为胞状树枝晶,合金层表层显微硬度达到548 HV0. 2,随着与表面距离的增加,显微硬度逐渐降低。脉宽、电流的增加和扫描速率的降低,均可增加合金层宽度;脉宽、扫描速率和电流的增加,合金层的层厚都呈现出先增大后降低的趋势,其中电流180 A,扫描速率150 mm/min,脉宽4. 0 ms,频率12 Hz为最佳工艺。

关键词(KeyWords)： 选区激光熔化;Ni-Al合金;激光工艺参数;显微组织;显微硬度

Abstract:

Keywords:

基金项目(Foundation): 重庆理工大学研究生创新基金(YCX2018224);; 重庆市大学生创新创业项目(201711660008)

作者(Author): 王长浩,叶宏,沈大臣,汪砚青

DOI: 10.13289/j.issn.1009-6264.2019-0204

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