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[1]杨旭东,潘攀,焦自贤,等.激光定向能量沉积钴基合金热疲劳行为[J].火箭推进,2023,49(04):106-114.
　YANG Xudong,PAN Pan,JIAO Zixian,et al.Thermal fatigue behaviors of cobalt-based alloys manufactured by laser directed energy deposition[J].Journal of Rocket Propulsion,2023,49(04):106-114.
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激光定向能量沉积钴基合金热疲劳行为

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V] 卷: 49 期数: 2023年04期 页码: 106-114 栏目: 目次 出版日期: 2023-08-25
Title:
Thermal fatigue behaviors of cobalt-based alloys manufactured by laser directed energy deposition
文章编号:
1672-9374(2023)04-0106-09
作者:
杨旭东1; 潘攀1; 焦自贤1; 张新宇2; 罗暘1; 丁稷萍1
(1.上海空间推进研究所,上海 201112; 2. 上海交通大学,上海 200240)
Author(s):
YANG Xudong1;  PAN Pan1;  JIAO Zixian1;  ZHANG Xinyu2;  LUO Yang1;  DING Jiping1
(1. Shanghai Institute of Space Propulsion, Shanghai 201112, China; 2.Shanghai Jiao Tong University, Shanghai 200240, China)
关键词:
激光定向能量沉积;  钴基合金;  热疲劳;  层错能
Keywords:
laser directed energy deposition;  cobalt-based alloy;  thermal fatigue;  stacking fault energy
分类号:
TG146.1
文献标志码:
A
摘要:
针对再生冷却推力室等零件在服役过程中经受循环热冲击,容易发生热疲劳失效等问题,采用机械球磨混粉和激光定向能量沉积相结合的方法,在Stellite 6合金中添加铝和镍元素,制备了新型钴基合金。在室温至600 ℃进行自约束热疲劳测试,并采用扫描电子显微镜、X射线衍射和激光共聚焦显微镜等多种方式系统表征了测试前后钴基合金的显微组织演变和裂纹萌生及扩展过程。结果表明:与商用Stellite 6钴基合金相比,铝和镍元素的添加抑制了沉积态钴基合金中ε-Co的出现,并且在热疲劳过程中也限制了γ-Co向ε-Co的转变。3Al合金和3Al5Ni合金热疲劳裂纹出现的临界循环次数分别提高了250次和550次,裂纹扩展速率降低了7.5%和12.25%。新型钴基合金拥有更高的层错能,组成相更稳定,热疲劳过程中γ/*相界面更少,减少了热疲劳裂纹萌生和扩展,从而大幅提升抗热疲劳性能。
Abstract:
The regeneration cooling thrust chamber is prone to thermal fatigue failure owing to cyclic thermal shock during the service process. To solve the problem, novel cobalt-based alloys were prepared by adding Al and Ni into Stellite 6 alloy through mechanical ball milling and laser directed energy deposition. The test was carried out on the self-confined thermal fatigue equipment from room temperature to 600 ℃. The evolutions of microstructures and cracks during the thermal fatigue test were systematically characterized through SEM, XRD and LSM. The results indicated that the additions of Al and Ni inhibit the formation of ε-Co in the deposited cobalt-based alloy compared with Stellite 6 alloy, meanwhile, the transformation of γ-Co to ε-Co is also restricted during the thermal fatigue test. The critical cycles of thermal fatigue crack of 3Al alloy and 3Al5Ni alloy increased by 250 and 550 cycles respectively. Moreover, the crack propagation rates of the alloys were reduced by 7.5% and 12.25%. Novelcobalt-based alloys exhibit higher stacking fault energy which could stabilize phases. It also decreases the amounts of γ/ε phase boundaries that easily occur thermal fatigue cracks, which is beneficial for improving thermal fatigue resistance.

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备注/Memo

收稿日期:2022-12-30; 修回日期:2023-02-06
基金项目:国家自然科学基金项目(52101139); 上海市“科技创新行动计划”启明星培育(扬帆专项)项目(23YF1428100)
作者简介:杨旭东(1992—),男,博士,工程师,研究领域为高温合金增材制造。

更新日期/Last Update: 1900-01-01