Diffusion Boronizing of H11 Hot Work Tool Steel

作者：Jurci Peter^*; Hudakova Maria

来源：Journal of Materials Engineering and Performance, 2011, 20(7): 1180-1187.

DOI：10.1007/s11665-010-9750-x

• boronizing
• Charpy impact strength
• fracture behavior
• hot work tool steel
• microstructure

The H11 hot work tool steel was boronized at various processing parameters, austenitized, quenched, and tempered to a core hardness of 47-48 HRC. Microstructure, phase constitution, and microhardness of boronized layers were investigated. Effect of boronized region on the bulk properties was determined by the Charpy impact test. Structure of boronized regions is formed by the compound layers and diffusion inter-layer. The compound layers consisted of only (Fe,Cr)(2)B phase, but in the case of longer processing time, they contained also of the (Fe,Cr)B-phase. The inter-layer contained enhanced portion of carbides, formed due to carbon diffusion from the boride compounds toward the substrate. Microhardness of boronized layers exceeded considerably 2000 HV 0.1. However, boronizing led to a substantial lowering of the Charpy impact toughness of the material.

• 出版日期2011-10