Influencing Microstructure of Vanadium Carbide Reinforced FeCrVC Hardfacing during Gas Metal Arc Welding

Metals

JeanPierre Bergmann¹  Karsten Günther² 

[1] Department of Production Technology, Ilmenau University of Technology, 98693 Ilmenau, Germany;Production Technology, University of Applied Sciences Osnabrueck–Campus Lingen, 49808 Lingen, Germany;

关键词: gas metal arc welding;    hardfacing;    heterogeneous nucleation;   

DOI  :  10.3390/met10101345

来源: DOAJ

【 摘 要 】

Vanadium carbide (VC) reinforced FeCrVC hardfacings have become important to improve the lifetime of tools suffering abrasive and impact loads. This is because the microstructural properties of such hardfacings enable the primary VCs to act as obstacles against the penetrating abrasive. Because dilution is supposed to be the key issue influencing the precipitation behaviour of primary carbides during surfacing, the development of deposit welding processes exhibiting a reduced thermal impact, and hence lower dilution to the base material, is the primary focus of the current research. By inserting an additional hot wire in the melt, an approach was developed to separate the material and energy input during gas metal arc welding (GMAW), and hence realised low dilution claddings. The carbide content could be increased, and a grain refinement was observed compared with conventional GMAW. These effects could be attributed to both the reduced dilution and heterogeneous nucleation.

【 授权许可】

Unknown