摘要
为明确珠光体含量对球墨铸铁氮化性能的影响,进一步提升液压缸体材料性能可靠性,本文通过氮化热处理试验研究不同珠光体含量球墨铸铁对其氮化层深度、白亮层厚度以及表面硬度的影响。试验结果表明:珠光体含量85%试块氮化层深度最浅为0.23 mm,珠光体含量65%试块氮化层深度为0.25 mm,与珠光体含量85%试块相差不多,珠光体含量20%试块氮化层深度最深为0.32 mm;白亮层厚度与氮化层深度大小变化趋势一致,氮化物级别均为1级;珠光体含量85%的试块表面硬度最高为维氏硬度657,珠光体含量65%和珠光体含量20%试块表面维氏硬度分别为635和621.本研究结果对于指导液压缸体用球墨铸铁材料的基体组织设计和氮化工艺优化,从而提升使用耐磨性与可靠性具有重要意义。
To clarify the influence of pearlite content on the nitriding behavior of ductile cast iron and thereby enhance the performance reliability of hydraulic cylinder body materials,this study investigated the effects of varying pearlite content on the ni⁃trided case depth,white layer thickness,and surface hardness of ductile cast iron through nitriding heat treatment experiments.The experimental results revealed that:the specimen with 85%pearlite content exhibited the shallowest nitrided case depth of 0.23 mm;the specimen with 65%pearlite content had a case depth of 0.25 mm,showing a negligible difference of only 0.02 mm compared to the 85%pearlite specimen;the specimen with 20%pearlite content demonstrated the deepest case depth of 0.32 mm.The white layer thickness followed a consistent trend with the case depth variations.The nitride compound level was uniformly Grade 1 for all specimens.Surface hardness was highest for the 85%pearlite specimen at 657 HV1,followed by the 65%and 20%pearlite specimens at 635 HV1 and 621 HV1,respectively.These findings provide significant guidance for optimizing the matrix microstructure design and nitriding process parameters of ductile cast iron used in hydraulic cylinder bodies and similar compo⁃nents,ultimately improving their wear resistance and operational reliability.
作者
李娜娜
彭广涛
王忻怡
姜爱龙
周有慧
李孝艳
LI Na-na;PENG Guang-tao;WANG Xin-yi;JIANG Ai-long;ZHOU You-hui;LI Xiao-yan(Weichai Power Co.,Ltd.,Weifang Shandong 261061,China)
出处
《铸造设备与工艺》
2025年第4期64-68,共5页
Foundry Equipment & Technology
关键词
氮化热处理
珠光体
球墨铸铁
氮化层深度
白亮层厚度
nitriding heat treatment
pearlite
nodular cast iron
depth of nitriding layer
white layer thickness
