ABSTRACT

In this study, the microwave hybrid heating process has been exploited to produce optimized joints of SS304/SS316. Three input parameters: materials of the specimens to be joined (X), grain-size of filler powder (Y), and processing time (Z) have been investigated to see their effects on two major joint properties: micro-hardness (P) and micro-tensile strength (Q). Welded joints of specimens have gone through mechanical characterization via Vicker’s micro-hardness tests and also the micro-tensile strength examinations. Outcomes have been used further for finding optimal settings of input parameters to achieve the best mechanical properties of joints. Grain-size of filler material is the most significant parameter; followed by specimen material. On the other hand, process time has little influence on output parameters within the small incremental time range of only 60 s considered during this work. SS304-SS304 (X₁) specimen materials with 70 nm (Y₁) filler powder at 360 s (Z₁) processing time input settings help in achieving optimal micro-hardness (P_optimal) and micro-tensile strength (Q_optimal). Microstructure test results of the developed joints reveal the formation of dense metallic microstructures across the joining region which justifies the reason for higher micro-hardness and micro-tensile strength of the joint region.

摘要

在这项研究中，已利用微波混合加热工艺来生产SS304 / SS316的优化接头。研究了三个输入参数：待连接试样的材料（X），填充粉末的粒度（Y）和加工时间（Z），以查看它们对两个主要接头性能的影响：显微硬度（P）和微拉伸强度（Q）。样品的焊接接头已通过维氏（Vicker）的显微硬度测试以及显微拉伸强度检查进行了机械表征。结果已进一步用于寻找输入参数的最佳设置，以实现接头的最佳机械性能。填充材料的粒度是最重要的参数。其次是标本材料。另一方面，在此工作中考虑的仅60 s的小增量时间范围内，处理时间对输出参数的影响很小。SS304-SS304（X₁）在70 s（Z ₁）处理时间输入设置下具有70 nm（Y ₁）填充粉的样本材料有助于实现最佳的显微硬度（P _best）和显微拉伸强度（Q _best）。发达的接头的显微组织测试结果表明，在整个接合区域形成了致密的金属显微组织，这证明了接合区域具有更高的显微硬度和显微拉伸强度的原因。