Effects of Deoxidizing Elements Ti and La on the Microstructure and Mechanical Properties of Additively Manufactured Martensitic Stainless Steel
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摘要: 马氏体时效不锈钢具有良好的可塑性和加工性能，是航空航天的重要结构材料。增材制造技术（AM，Additive Manufacturing）已广泛应用于航天复杂结构件的生产，选区激光熔化技术（SLM，Selective Laser Melting）是金属增材制造技术最流行的方法之一。然而，大尺寸氧化夹杂物会显著降低SLM制备零件的力学性能。借鉴传统钢铁冶金工艺中脱氧元素的应用，为进一步探究粉末中加入脱氧元素对增材制造马氏体不锈钢的影响，本文采用不同制粉方式制备了四种不同成分的马氏体不锈钢粉末，并在不同工艺参数下进行了SLM实验。研究了脱氧元素Ti、La及粉末制备工艺对增材制造马氏体不锈钢样品中氧化物形态、分布及其组织和力学性能的影响。结果发现脱氧元素的加入减小了样品中氧化物的平均尺寸及数量密度，提高了样品的抗拉强度。这为调控增材制造马氏体不锈钢中的氧化物，实现氧化物无害化甚至有益化提供了参考。Abstract: Martensitic aging stainless steel, known for its excellent plasticity and workability, is a vital material in aerospace applications. Additive Manufacturing (AM), particularly Selective Laser Melting (SLM), is widely used for producing complex aerospace components. However, large oxide inclusions can significantly degrade the mechanical properties of SLM parts. This study investigates the effects of adding deoxidizing elements Ti and La to powders on the properties of additively manufactured martensitic stainless steel. Four different powders were prepared and tested under various SLM process parameters. The addition of Ti and La reduced oxide size and density, improving tensile strength. These findings offer insights for controlling oxides in additively manufactured martensitic stainless steel, making them harmless or beneficial.
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Keywords:
- Martensitic aging stainless steel /
- Oxides /
- SLM /
- Deoxidizing elements /
- Microstructure /
- Mechanical properties
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