gdl审审1共渗工钢渗碳后硫氮碳共渗工艺研究-gdl review 1 co-carburizing process research on sulfur, nitrogen and carbon co-carburizing process of co-carburizing steel.docx

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gdl审审1共渗工钢渗碳后硫氮碳共渗工艺研究-gdl review 1 co-carburizing process research on sulfur, nitrogen and carbon co-carburizing process of co-carburizing steel.docx

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gdl审审1共渗工钢渗碳后硫氮碳共渗工艺研究-gdl review 1 co-carburizing process research on sulfur, nitrogen and carbon co-carburizing process of co-carburizing steel

S2－的浓度对材料性能影响的研究，以探索S元素的渗入对钎杆疲劳寿命的影响规律。关键词：钎杆、GDL-1、失效分析、盐浴、硫氮碳共渗InvestigationoftheSaltBathSulfonitrocarburizingprocessafterCarburizingofthesteelGDL-1AbstractAsaconsumabletoolinmining,tunneland other infrastructures, drill rod’s majorfailuremodeisintheformofabrasion,plasticdeformation,stressfatigueandfracture,andthusthebasicrequirements fordrill rodsteel ishighstrength,hightoughness, wearresistance,corrosionresistanceandhighimpactfatigueperformance,highair-cooledhardening,simplyheattreatmentprocess,lowcostandsoon.Asoneoftheseriesoftoolsteel-GDL,whichisdevelopedbyProfessorLiangYilong’sstudygroupofGuizhouUniversity,GDL-1steelhashighstrengthandtoughnesswithexcellentperformance,andhasbeenwidelyusedintheautomotive gearsanddrillrods.Basedonthein-depthanalysisandresearchofthefracturefailuremodeandmechanismoftheGDL-1steelrod,thecompositedheattreatmentoftheSaltBathSulfonitrocarburizingprocessafterCarburizingisinvestigatedinthispaper,Theorthogonalexperimentmethodwereusedtoanalyzetheeffectoftime,temperatureandconcentrationofCNO-tothehardness,nitridingdepthandcompoundlayerdepthofthesteelGDL-1,thecompositionofthelayer,thedistributionofnitrogenandcarbonandthephasestructureofthelayerhasbeenanalyzedbyEPMAandXRD.Thenthefollowingconclusionshasbeenobtained:ThefracturefailuremodeoftheGDL-1steelisfatiguefractureinthepartofscrewcausedbyabrasion.ThesurfacehardnessdependontheconcentrationofCNO-,withtheCNO-concentrationincreased,thetrendofthesurfacehardnessisfirstroseandthendropped,thesurfacehardnessreachesitsmaximumwhentheCNO-concentrationisabout18%.Thetemperatureandtimehaveagreatinfluenceonthedepthofthenitridinglayer,withtheriseoftemperatureandthelengthenofthetimethedepthofthelayerincreases,butwhenthetemperatureexceed560℃andtimereaches2.5hours,theincreasespeedofthedepthofthelayerisslowdown.Theformationofthecompoundlayerdependonthetemperature,thecompoundlayerwillrapidlythickeningwhenthetemperatureexceed560℃.Thebestparametersis:CNO-18%,560±10℃×2.5h,inthiscase,theworkpiecehasahigherhardnessa