航天推进技术研究院主办
[1]周亚雄,吴晓明,杨欢庆,等.航天高强不锈钢LMD成形缺陷分析及控制[J].火箭推进,2022,48(01):90-96.
ZHOU Yaxiong,WU Xiaoming,YANG Huanqing,et al.Defect analysis and control in aerospace high strength stainless steel by laser melting deposition[J].Journal of Rocket Propulsion,2022,48(01):90-96.
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ZHOU Yaxiong,WU Xiaoming,YANG Huanqing,et al.Defect analysis and control in aerospace high strength stainless steel by laser melting deposition[J].Journal of Rocket Propulsion,2022,48(01):90-96.
航天高强不锈钢LMD成形缺陷分析及控制
《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]
卷:
48
期数:
2022年01期
页码:
90-96
栏目:
工艺与材料
出版日期:
2022-02-28
- Title:
- Defect analysis and control in aerospace high strength stainless steel by laser melting deposition
- 文章编号:
- 1672-9374(2022)01-0090-07
- 分类号:
- V461
- 文献标志码:
- A
- 摘要:
- 为明晰航天高强不锈钢激光熔化沉积成形过程基础科学问题,推动其在航天液体火箭发动机领域的应用进程,针对航天高强不锈钢LMD成形过程中常见表面焊瘤、气孔、熔合不良等缺陷的形貌特征及产生机理进行深入分析,并提出对应的控制措施:通过优化边框扫描速度促进熔覆道的流动变形,极大减少了成形件侧表面及倾斜面的焊瘤缺陷; 使用PREP方法制备粉末材料替代当前GA法制备的粉末材料,成形试件孔隙率降低至0.1%以下,气孔缺陷基本消除; 采用提升“层间重熔能力”和减小相邻熔覆道间“沟壑”高度的方法,消除了成形件内部熔合不良缺陷。
- Abstract:
- In order to clarify the basic scientific problems of laser melting deposition forming process of aerospace high strength stainless steel,to promote its application in the field of aerospace liquid rocket engine,the defect types and mechanism of aerospace high strength stainless steel by laser melting deposition were analyzed. Besides,the corresponding control measures were put forward. First,the flow deformation of cladding channel was promoted by optimizing the scanning speed of border,the defects of weld nodules on the side surface and inclined surface of the formed part are greatly reduced.Second,the PREP method of powder preparation was used instead of the current GA method,the porosity of the formed specimen was reduced to less than 0.1%,and the stomatal defects were basically eliminated.Finally,the method of increasing the "layer remelting capacity" and decreasing the "gully" height between adjacent cladding channels was adopted,the defects of bad internal fusion were eliminated.
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备注/Memo
收稿日期:2020-03-15; 修回日期:2020-07-23
基金项目:国防科技工业局民用航天技术预先研究项目(D010502)
作者简介:周亚雄(1991—),男,硕士,工程师,研究领域为金属增材制造。
更新日期/Last Update:
1900-01-01