Wang Tai, Ao San San, Manladan S M, Cai Yang Chuan, Luo Zhen
School of Material Science and Engineering, Tianjin University, Tianjin 300072, China.
Materials (Basel). 2019 Sep 6;12(18):2883. doi: 10.3390/ma12182883.
The surface of Q235 low carbon steel was modified by the metal inert-gas welding (MIG) method; a 304 stainless steel surfacing layer was fabricated to improve the properties of Q235 low carbon steel. For practical industry application, keyhole tungsten inter gas (K-TIG) welding was used to weld the surface-modified plates. The microstructure, elemental distribution, micro-hardness, and corrosion resistance of the surface-modified plates and the welded joints were analyzed. The corrosion tests of welded joints and surface-modified plates were carried out with the electrochemical method and hydrochloric acid immersion method, respectively, and surface morphology after corrosion was studied. The results show that the surface-modified plates and their welded joints were defect-free. The microstructure of the surfacing layer consisted of austenite, martensite, and ferrite; and the microstructure of the weld consisted mainly of martensite. The hardness and corrosion resistance of the surfacing layer was superior to that that of low carbon steel. The micro-hardness of the weld is higher than that of the stainless steel surfacing layer and the base material. The corrosion resistance of the surfacing layer is the best, and the corrosion resistance of the welding seam is better than that of the base material.
采用熔化极气体保护焊（MIG）方法对Q235低碳钢表面进行改性；制备了304不锈钢堆焊层以改善Q235低碳钢的性能。为了实际工业应用，采用小孔钨极气体保护焊（K-TIG）对表面改性板材进行焊接。分析了表面改性板材及焊接接头的微观结构、元素分布、显微硬度和耐腐蚀性。分别采用电化学方法和盐酸浸泡法对焊接接头和表面改性板材进行腐蚀试验，并研究了腐蚀后的表面形貌。结果表明，表面改性板材及其焊接接头无缺陷。堆焊层的微观结构由奥氏体、马氏体和铁素体组成；焊缝的微观结构主要由马氏体组成。堆焊层的硬度和耐腐蚀性优于低碳钢。焊缝的显微硬度高于不锈钢堆焊层和母材。堆焊层的耐腐蚀性最好，焊缝的耐腐蚀性优于母材。
Zotero 插件
