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首页> 外文期刊>Surface & Coatings Technology >Characterization of laser clad yttria partially-stabilized ZrO2 ceramic layers on steel 16MnCr5
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Characterization of laser clad yttria partially-stabilized ZrO2 ceramic layers on steel 16MnCr5

机译：16MnCr5钢上激光熔覆氧化钇部分稳定的ZrO2陶瓷层的表征

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摘要

One-step laser cladding technique was used to melt 7 wt.% yttria partially stabilized zirconia (YPSZ) powder particles to produce single tracks of ZrO2 ceramic layers on steel 16MnCr5. The ceramic layers were analyzed using optical microscope, scanning electron microscope (SEM), X-ray diffractometer (XRD) and microhardness testing techniques for the study of microstructure, topography, cracking formation and hardness. This laser cladding process involved a continuous feeding of ZrO2 powder into the melt pool as the metal substrate was moved under laser beam at various traverse speeds. The optimum parameters for laser cladding were: 1.6-2.0 kW laser power, 300-500 mm/min traverse speed, 3 mm beam diameter and 5-7 g/min feed rate. Under these conditions, the clad ceramic layers consisted mainly of non-transformable t' phase and the retained c phase. Cross-sections of the clad layers showed three distinct microstructural regions which consisted of planar crystals at the bottom, columnar grains in the intermediate, and equiaxed grains at the upper. Two kinds of different combination modes were observed to be straight interface combination and diffusion fusion connection. In the latter combination, Fe and Cr elements diffused preferably along the grain boundaries into the ceramic layer. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 16]
机译：使用一步激光熔覆技术熔化7 wt。％的氧化钇部分稳定的氧化锆（YPSZ）粉末颗粒，以在钢16MnCr5上产生单迹ZrO2陶瓷层。使用光学显微镜，扫描电子显微镜（SEM），X射线衍射仪（XRD）和显微硬度测试技术对陶瓷层进行了分析，以研究显微组织，形貌，裂纹形成和硬度。该激光熔覆过程涉及将ZrO2粉末连续喂入熔池中，因为金属基材在激光束下以各种移动速度移动。激光熔覆的最佳参数为：1.6-2.0 kW激光功率，300-500 mm / min的横向速度，3 mm的光束直径和5-7 g / min的进给速度。在这些条件下，包覆陶瓷层主要由不可变形的t'相和保留的c相组成。包覆层的横截面显示出三个不同的微结构区域，其由底部的平面晶体，中间的柱状晶粒和上部的等轴晶粒组成。观察到两种不同的组合方式：直界面组合和扩散融合连接。在后一种组合中，Fe和Cr元素优选沿晶界扩散到陶瓷层中。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：16]

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