Microstructural Evolution of Laser Metal Deposited 17-4 PH SS-Tungsten Composite with Varying Volume Percent Tungsten

Q4 Engineering Annals of Dunarea de Jos University of Galati, Fascicle XII, Welding Equipment and Technology Pub Date : 2018-12-28 DOI:10.35219/awet.2018.06

A. Adeyemi, E. Akinlabi, Rasheedat Modupe Mahamood

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引用次数: 2

Abstract

This study investigates the influence of the quantity of tungsten powder on the microstructural evolution of 17-4 PH stainless steel-tungsten composite produced using laser metal deposition process. The 17-4 PH stainless steel and tungsten powders were deposited on 316 stainless steel substrate at laser power of 2600 W. The tungsten powder flow rate was varied between 0.5 rpm and 2.0 rpm while 17-4 PH stainless steel powder flow rate, the scanning speed, the gas flow rate and the laser spot size were fixed at 2.0 rpm, 0.5 m/s, 2.5 l/min and 2.0 mm respectively. Five (5) multiple tracks of 17-4 PH stainless steel and tungsten powder were deposited on316 stainless steel of 10 mm thickness from different hopper at 50% overlapping percentage to produce 17-4 PH SS-W composite. During the microstructural study, it was observed that tungsten carbide has been precipitated in-situ and evenly dispersed in the 17-4 PH SS-W composite produced. SEM and EDS analyses also revealed the presence of BCC alpha (α) ferrite and FCC gamma (δ) ferrite with the presence of sigma (σ) phase precipitates.

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激光金属沉积17-4 PH ss -钨复合材料的微观组织演变

研究了钨粉用量对激光金属沉积法制备的17-4PH不锈钢-钨复合材料微观结构演变的影响。在2600W的激光功率下，将17-4PH不锈钢和钨粉末沉积在316不锈钢基底上。钨粉末流速在0.5rpm和2.0rpm之间变化，而17-4PH的不锈钢粉末流速、扫描速度、气体流速和激光光斑尺寸分别固定在2.0rpm、0.5m/s、2.5l/min和2.0mm。将17-4PH不锈钢和钨粉的五（5）个多轨道以50%的重叠百分比沉积在来自不同料斗的10mm厚度的316不锈钢上，以制备17-4PH SS-W复合材料。在微观结构研究过程中，观察到碳化钨已原位沉淀并均匀分散在生产的17-4PH SS-W复合材料中。SEM和EDS分析还揭示了BCCα铁氧体和FCCγ铁氧体的存在以及σ相沉淀的存在。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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