Experimental study on the effects of FSP and nanoparticle dispersion on the mechanical properties and microstructure of 316L stainless steel produced by SLM

IF 2.4 4区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING
Morteza Omidi, Amir Mostafapour, Ali Ebrahimpour
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Abstract

The study investigates the effects of friction stir processing (FSP) and silicon carbide (SiC) nanoparticle dispersion on the mechanical properties and microstructure of 316L stainless steel produced by selective laser melting (SLM). To achieve defect-free samples, FSP was conducted at 710 rpm and 31.5 mm/min, providing sufficient heat input to prevent void formation. Significant grain refinement was observed, with SiC nanoparticle–reinforced samples achieving an average grain size of 205 nm, compared to 715 nm for FSP-only samples and 12 µm for the base metal. X-ray diffraction confirmed the material remained single-phase austenitic. Mechanical testing showed that hardness increased by 95% with SiC nanoparticles and 55% without, while tensile strength and yield stress improved by 30–40% for SiC-reinforced sample and 15–20% for only FSPed sample, without significant reduction in elongation and ductility. The study concludes that FSP, especially with SiC nanoparticles, effectively enhances the mechanical properties and refines the microstructure of 316L stainless steel, making it a promising post-processing technique for SLM-produced parts.

Abstract Image

FSP和纳米颗粒分散对SLM 316L不锈钢力学性能和显微组织影响的实验研究
研究了搅拌摩擦加工(FSP)和碳化硅(SiC)纳米颗粒分散对选择性激光熔化(SLM) 316L不锈钢力学性能和显微组织的影响。为了获得无缺陷样品,FSP以710 rpm和31.5 mm/min的速度进行,提供足够的热量输入以防止孔隙形成。观察到显著的晶粒细化,SiC纳米颗粒增强样品的平均晶粒尺寸为205 nm,而fsp样品的平均晶粒尺寸为715 nm,母材为12 μ m。x射线衍射证实该材料仍为单相奥氏体。力学测试表明,添加SiC纳米颗粒后,硬度提高了95%,未添加SiC纳米颗粒后,硬度提高了55%;添加SiC纳米颗粒后,拉伸强度和屈服应力分别提高了30-40%和15-20%,伸长率和延性没有明显降低。研究表明,FSP,特别是SiC纳米颗粒,可以有效地提高316L不锈钢的力学性能并细化其组织,使其成为slm生产零件的一种有前途的后处理技术。
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来源期刊
Welding in the World
Welding in the World METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
4.20
自引率
14.30%
发文量
181
审稿时长
6-12 weeks
期刊介绍: The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.
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