High chromium white cast iron (HCWCI) is exceptionally hard. Its hardness typically exceeds 746 HV. In comparison, martensite has a hardness of around 410 HV. This high hardness is due to the formation of chromium carbides in a ferrous matrix having fine martensite plates. HCWCI is ideal for abrasion-resistant applications like mining and earth-moving equipment. The high alloy content makes it expensive.

However, HCWCI is extremely brittle, rendering it “unweldable,” meaning worn-out parts cannot be effectively repaired – bad for sustainability goals.

Picture (A) illustrates the current challenges encountered when attempting to weld or clad HCWCI, highlighting the brittleness issue.

At the Welding and Additive Manufacturing Centre, Cranfield University, we developed a specialized welding alloy using additive manufacturing technology. We created welding procedures, established a process window and strategy, and applied the new alloy to successfully weld HCWCI. Picture (B) shows the outcome of our work.

For the first time, we can assert, HCWCI has been successfully cladded with minimal or no cracking. This novel result opens up numerous possibilities for industrial applications. A plus for sustainability goals.

For further details, contact: materialsandwelding@gmail.com