A Case Study for a Worn Tool Steel in the Hot Stamping Process
Journal article, 2023

A good understanding of failure mechanisms can help us improve the lifetime of the dies. This paper presents a case study investigating the wear behavior of a QRO90 die insert utilized for stamping uncoated boron-alloyed high-strength steel sheets. Topography and microstructure were characterized by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), hardness measurement and X-ray photoelectron spectroscopy (XPS). Severe galling due to accumulated layers transferred from the boron-alloyed steel workpieces occurred on the die surface. Material softening was detected in the sublayer of the tool steel (up to ∼200 μm). In addition, white layers with a in a thickness of 1-2 μm were frequently observed on the surface of the round corner of the tool. The main wear mechanisms are discussed. Galling caused by surface softening and the spallation of white layers are considered to be the primary wear mechanisms for the tool.

hot stamping diefailure mechanismsurface softeningtransfer materials

Author

Miwen Yuan

Chalmers, Industrial and Materials Science, Materials and manufacture

Seshendra Karamchedu

Uddeholms

Yicheng Fan

ASSAB Tooling Technology Ltd.

Libin Liu

Central South University

Lars Nyborg

Chalmers, Industrial and Materials Science, Materials and manufacture

Yu Cao

Chalmers, Industrial and Materials Science, Materials and manufacture

Journal of Materials Research and Technology

22387854 (ISSN)

Vol. 22 1065-1075

Subject Categories

Tribology

Manufacturing, Surface and Joining Technology

Metallurgy and Metallic Materials

DOI

10.1016/j.jmrt.2022.12.006

More information

Latest update

2/16/2023