Microstructure and Tribological Performance of
45CrNiMoVA Steel Welded Surfacing Layer

MENG Fanjun  ZHU Sheng  BA Dema

(National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072)

Abstract: The wear resistant welded surfacing layer is prepared on 45CrNiMoVA steel with UTP A DUR600 wear resistant weld wire by means of pulse metal inert-gas arc welding technology. The microstructure of welded surfacing layer is observed and analysed by scanning electronic microscopy(SEM); And the microhardness and wearing resistance are tested. The results show that the microstructure of welded surfacing layer is mainly composed of austenite and secondary cementite; The welded surface layer has higher microhardness and more excellent wearing resistance than 45CrNiMoVA steel substrate; The existence of hard secondary cementite, the work hardening of austenite and fragmentation, dynamic oxidation and hot pressed sintering of abrasive dust are mainly reasons which make welded surface layer possess more excellent wearing resistance.

Key words: 45CrNiMoVA steel  Metal inert-gas arc welding  Frictional wear

CLC No: TG434

国家自然科学基金(50075086, 50235030)、部委基金(413270403)和新世纪优秀人才支持计划资助项目. Received 20070430, received in revised form 20070929

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