锻压技术

SLM 3D打印St6钴基合金燃油器喷头可行性分析

英文标题：Practicability analysis on St6 cobalt-based alloy fuel injector nozzle for SLM 3D print

作者：孙常奋陈勇许久海

单位：1. 沪东重机有限公司综合技术所 2. 中国科学院重庆绿色智能技术研究院 3. 中船海洋动力部件有限公司

分类号：TG316.2

出版年,卷(期):页码：2021,46(3):158-161

摘要：

设计、对比了不同选区激光熔化工艺(Selective Laser Melting, SLM)3D打印St6钴基合金燃油器喷头的试验方案，热等静压（HIP）后，通过表面质量及微观金相检查，对St6钴基合金燃油器喷头3D打印工艺的可行性进行分析。针对打印中出现的表面球化、层间开裂、内部组织不致密、内部裂纹、析出物聚集等缺陷，论证了C含量过高、熔化成形中化学成分改变及流动性变差是原3D打印St6钴基合金燃油器喷头工艺不适应性的主要原因。优化制造方案，调整了St6钴基合金成分，改进了SLM工艺参数，功率取400 W，行距HS取125 μm，经粉末优化、SLM 3D打印燃油器喷头试样及HIP后，得到产品的金相组织、常温力学性能、高温力学性能、高温疲劳测试合格，产品制造质量满足了设计要求。

The test schemes of different Selective Laser Melting (SLM) processes for 3D print of St6 cobalt-based alloy fuel injector nozzle were designed and compared, and the process feasibility of 3D print for St6 cobalt-based alloy fuel injector nozzle was analyzed by checking the surface quality and microstructure after HIP. According to the printing defects such as surface spheroidization、interlayer cracking、loose internal structure、internal cracks、precipitation accumulation, etc., it was demonstrated that the main reasons for process incompatibility of original 3D print for St6 cobalt-based alloy fuel injector nozzle were excessive C content、changeing chemical component and poor fluidity during melt forming. Then, the manufacturing scheme was optimized by adjusting the chemical composition of St6 cobalt-based alloy and SLM process parameters with the power of 400 W and the HS of 125 μm. After powder optimizing, SLM 3D printing fuel injector nozzle samples and HIP, the test results show that the microstructure analysis, room temperature mechanical properties, high temperature mechanical properties and high temperature fatigue tests are found satisfactory, and the manufacturing quality meets the design requirements.

基金项目：

工信部船用低速双燃料机原理样机研制（CDGC01-KT0310）

孙常奋（1965-），男，硕士，高级工程师 E-mail：13601838731@126.com

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