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1、新型礦山濕磨機襯板鋼在不同介質(zhì)和沖擊功下的沖擊腐蝕磨損性能摘要礦山濕磨機服役環(huán)境惡劣,對襯板材料的綜合性能要求較高,傳統(tǒng)襯板材料各有不足,使用壽命較短。針對這一問題,設計熔煉了一種新型CrNiMo低碳高合金襯板鋼,并對其組織和性能作了系統(tǒng)分析。借助能譜分析,x射線衍射鑒定以及金相觀察,發(fā)現(xiàn)CrNiMo低碳高合金鋼經(jīng)過適當熱處理后組織為單相馬氏體,測定其力學性能,數(shù)據(jù)顯示材料的綜合性能良好,硬度和韌性搭配適宜。通過靜態(tài)腐蝕試驗和電化學試驗測定CrNiMo低碳高合金鋼的耐腐蝕性能,結(jié)果表明:CrNiMo低碳高合金鋼在酸性和中
2、性介質(zhì)均發(fā)牛陽極鈍化現(xiàn)象,材料在酸性介質(zhì)中陰極反應為析氫反應,而中性介質(zhì)中為吸氧反應,析氫反應速度快于吸氧反應。CrNiMo低碳高合金鋼在堿性介質(zhì)中腐蝕反應屬于陰極和陽極混合控制類型,腐蝕速度適中。CrNiMo低碳高合金鋼在中性介質(zhì)中最穩(wěn)定,在酸性介質(zhì)中最易被腐蝕。利用MLD一10型動載磨粒磨損試驗機測試了酸性介質(zhì)中不同沖擊功下CrNiMo低碳高合金鋼的磨損性能。結(jié)果表明:沖擊功大小對CrNiMo低碳高合金鋼的磨損性能有重要影響,相同實驗時間內(nèi)材料的失重隨沖擊功的增大而增大。結(jié)合SEM和亞表層金相觀察分析CrNiMo低碳
3、高合金鋼在不同沖擊下的磨損機理,結(jié)果表明:材料在O.8J沖擊功下的磨損機理豐要是顯微切削,兼有一定的多次塑變機制和輕微的腐蝕磨損;在1.5J沖擊功下材料的磨損機理隨實驗時間的延長而有所變化,磨損前期為顯微切削,磨損后期為低周疲勞斷裂以及腐蝕磨損。關鍵詞:襯板,CrNiMo低碳高合金鋼,介質(zhì),磨損機制EffectofMediatorandImpactEnergyontheImpactCorrosionAbrasionPropertiesofNewWetGrindingLinerAbstractsWetgrindingmil
4、lsworkinamal—condition,wetgrindinglinersneedacombinationproperty.Traditionallinerscan’tuseenduringlybecauseoftheirdefects.Tosolvethisproblem,anewCrNiMolowcarbonhiighalloylinersteelisdesignedandsmelted,anditsstructuresandpropertiesareanalysed.BytheEDS,X-raydiffrac
5、tionandmetallographicanalysis,itwasfoundthatthefinalmicrostractttreoftheCrNiMolowcarbonhilghalloysteelismartensiteafterheattreatment.ThemechanicalpropertymeasurementshowsthattheCrNiMolowcarbonhi曲alloysteelhasanexcellentcombinationproperties,andabettermatchbetween
6、hardnessandductility.Thestaticcorrosiveexperimentandelectrochemicalexperimentwereinvestigated.Theresultsshowthatthereisananodepassivationonthematerialsurfaceinbothacidicandneutralmediators.Intheacidicmediatorthecmhodereactionofthesystemishydrogenevolutionreaction
7、,intheneutralmediatoritabsorbsoxygen.Thespeedofcathodereactioninacidicmediatorisfasterthanthatinneutral.Inalkalimediatorthecorrosivereactioniscontrolledbybothanodereactionandcathodereaction,andthespeedismoderate.TheCrNiMolowcarbonhighalloysteelismoststabileinneut
8、ralmediator,and1eastinacidicmediator.Thewearpropertyinthesameacidicslurrybutdifferentimpactenergiesisinvest—tigatedbymeansofMLD一10tester.Theresultsshowthatimpa