Experimental investigation on WAAM-based functional hard-facing bimetallic part

Abstract

In the traditional production of functional bimetallic parts with hard surfaces, the materials for the hard surfaces are usually applied to a base metal, a process that is often complex, costly, and time-consuming. In this paper, the Wire Arc Additive Manufacturing (WAAM) process is proposed as an alternative approach for the production of functional bimetallic parts with hardfacing wire to increase wear resistance. In this study, the hard-facing bimetallic part was fabricated by depositing Hardcor 600 G hardfacing wire onto the deposited 316L Si austenitic stainless steel. After the initial visual inspection and digital X-ray tests, the hardness distribution and macro- and microstructural examinations were carried out. In the subsequent analyses, tensile and Charpy V-notch tests were carried out on the samples taken from the manufactured bimetallic part. The mechanical properties of the functional hard-facing bimetallic parts showed different properties of the bimetallic part, with the Hardcor 600 G side exhibiting higher strength compared to the SS 316L Si side. In addition, the Charpy-V notch test showed a notable difference in impact resistance, with the SS 316L Si side having the highest strength, the Hardcor 600 G side having the lowest strength, and the interface being in between. The results show that the WAAM process is a viable alternative to produce functional bimetallic components with hard surfaces, especially for applications requiring increased wear resistance.

Keywords

• waam-based manufacturing
• hard-facing welding wire
• bimetallic wear-resistant component
• bimetallic interface