Effect of TIG welding on corrosion behavior of 316L stainless steel
Effect of TIG welding on corrosion behavior of 316L stainless steel
复制标题
DOI：
10.1016/j.matlet.2006.09.008
复制
发表时间：
2007-05-01
影响因子：
3
通讯作者：
Saatchi, A.
中科院分区：
文献类型：
--
作者：
Dadfar, M.;Fathi, M. H.;Saatchi, A.
316L 不锈钢 (SS) 是骨科植入物中消耗最多的材料之一。某些类型的骨科植入物（例如整体髋关节柄）通常由焊接在一起的两个元件制成。本研究研究了TIG焊对316L不锈钢在生理溶液中腐蚀行为的影响。在该方法中，由于样品厚度较小，未使用填充金属，而是将其焊接成搭接形式。用动电位极化曲线研究了 37℃ 生理溶液中的腐蚀行为。用扫描电子显微镜（SEM）研究了母材（BM）和焊缝金属（WM）的显微组织。将焊缝金属、母材和偶合体（BM 和 WN 一起）的腐蚀行为放在一起进行比较。为了检测 BM 和 WM 中的微观结构和相，进行了 X 射线衍射分析。最后，对焊后样品进行焊后热处理（PWHT）。结果表明，WM 的腐蚀行为优于 BM。这种现象归因于 BM 中存在的二次相。当母材因焊接过程而熔化时，焊缝金属中的二次相会溶解。根据电化学分析结果，确定一对部件的腐蚀速率高于其他部件。热影响区 (HAZ) 是造成这种现象的原因。焊缝金属的相邻区域通常耐腐蚀性较差，因此当钢材暴露在腐蚀环境中时会优先受到侵蚀。 PWHT 降低了电偶的腐蚀速率。 (c) 2006 Elsevier B.V. 保留所有权利。
316L stainless steel (SS) is one of the most consumable materials in orthopedic implants. Certain types of orthopedic implants such as mono-bloc hip stems are often made of two elements welded together. In this study, effect of TIG welding on corrosion behavior of 316L stainless steel in physiological solution was investigated. In this method, filler metal wasn't used due to the small thickness of samples and it was welded to lap form. Corrosion behavior in physiological solution at 37 degrees C was investigated with potentiodynamic polarization curves. Microstructure of base metal (BM) and weld metal (WM) was studied with scanning electronic microscopy (SEM). The corrosion behavior of weld metal, base metal and couple (BM and WN together) was compared together. For detecting microstructure and phases in BM and WM, X-ray diffraction analysis was done. Finally, post-weld heat treatment (PWHT) was performed on as-welded samples. Results indicated that corrosion behavior of WM was better than the BM. This phenomenon was attributed to secondary phases that were present in the BM. Secondary phases in the weld metal are dissolved when the base metal is melting due to the welding process. Based on the results of electrochemical analysis, it was determined that the corrosion rate of a couple was more than of other parts. Heat affected zone (HAZ) is responsible for this phenomenon. The adjacent zones of the weld metal are classically less corrosion resistant, thereby being attacked preferentially when the steel is exposed to corrosive environments. PWHT decreased the corrosion rate of the couple. (c) 2006 Elsevier B.V. All rights reserved.