This work employed Fe-Cr-C alloy as the cladding material to fabricate wear-resistant coatings on dissimilar steel welded joints composed of NM450 wear-resistant steel and ZG30 SiMn cast steel with ER70-G welding wire...This work employed Fe-Cr-C alloy as the cladding material to fabricate wear-resistant coatings on dissimilar steel welded joints composed of NM450 wear-resistant steel and ZG30 SiMn cast steel with ER70-G welding wire.The investigation focused on elucidating the effect of dilution ratio levels on microstructural distribution and wear behavior within this heterogeneous multi-material system.Owing to its inherently higher chromium(Cr)content,the NM450 region demonstrated more pronounced carbide formation compared to the ER70-G and ZG30 SiMn regions.Microstructural analysis revealed that Cr_(7)C_(3) carbides predominantly formed along grain boundaries,whereas Cr_(23)C_(6) carbides mainly precipitated within grains.After cladding,the wear resistance of the NM450/ER70-G/ZG30 SiMn welded joint was markedly improved,with the high-dilution coating exhibiting superior performance.This enhancement was attributed to favorable thermal conditions in the highdilution scenario,promoting a more homogeneous precipitation of Cr_(23)C_(6).Although significant elemental mixing occurred at the interfacial zones,the top region of the cladding layer remained minimally affected by dilution-induced drawbacks.Accordingly,the high-dilution sample demonstrated better wear resistance than its low-dilution counterpart due to optimized carbide precipitation characteristics.These findings provide basic insights for designing effective cladding strategies for complex multi-material components in demanding industrial applications.展开更多
文摘This work employed Fe-Cr-C alloy as the cladding material to fabricate wear-resistant coatings on dissimilar steel welded joints composed of NM450 wear-resistant steel and ZG30 SiMn cast steel with ER70-G welding wire.The investigation focused on elucidating the effect of dilution ratio levels on microstructural distribution and wear behavior within this heterogeneous multi-material system.Owing to its inherently higher chromium(Cr)content,the NM450 region demonstrated more pronounced carbide formation compared to the ER70-G and ZG30 SiMn regions.Microstructural analysis revealed that Cr_(7)C_(3) carbides predominantly formed along grain boundaries,whereas Cr_(23)C_(6) carbides mainly precipitated within grains.After cladding,the wear resistance of the NM450/ER70-G/ZG30 SiMn welded joint was markedly improved,with the high-dilution coating exhibiting superior performance.This enhancement was attributed to favorable thermal conditions in the highdilution scenario,promoting a more homogeneous precipitation of Cr_(23)C_(6).Although significant elemental mixing occurred at the interfacial zones,the top region of the cladding layer remained minimally affected by dilution-induced drawbacks.Accordingly,the high-dilution sample demonstrated better wear resistance than its low-dilution counterpart due to optimized carbide precipitation characteristics.These findings provide basic insights for designing effective cladding strategies for complex multi-material components in demanding industrial applications.
