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ID:11063501
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时间:2018-07-09
《hardening and tempering of plain carbon steel 中英翻译(普通碳素钢的淬火与回火)机械论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、班级:机电08-1学号:08024040131姓名:麦嘉伟HardeningandTemperingofPlainCarbonSteelPlaincarbonsteelhasbeenvaluedfromearlytimebecauseofcertainproperties.thissoftsilver-graymetalcouldbeconvertedintoasuperhardsubstancethatwouldcutglassandmanyothersubstances,includingi
2、tselfwhensoft.Furthermore,itshardnesscouldbecontrolled.Thisconvertingofcarbonsteelintoasteelofusefulhardnessisdonewithdifferentheattreatments,twoofthemostimportantofwhicharehardeningandtempering(drawing),what’stheplaincarbonsteelandwhichyouwillinvest
3、igateinthislesson.PlainCarbonSteelInsimpleterms,aplaincarbonsteelmaybesaidtobeanalloyofironandcarboncontaininglessthan1.7%carbon.Inpractice,however,thesesteelsrarelycontainmorethanabout1.4%carbonandotherelementsarealsopresent,eitherasdeliberateadditi
4、ons(e.g.manganese)orasimpurities(e.g.sulphurandphosphorus).Plaincarbonsteelsmaybeclassifiedintothreemaingroups:1.Lowcarbonsteel(mildsteel)containinglessthan0.3%carbon.2.Mediumcarbonsteelcontaining0.3%to0.6%carbon.3.Highcarbonsteelcontaining0.6%to1.4%
5、carbon.LowcarbonsteelLowcarbonsteelsmaybesub-dividedinto:1.Deadmildsteelcontaining0.05%to0.10%carbonInthemanufactureofthismaterial,completedeoxidationisnotcarriedoutanditismadeasrimmingsteel.Itisproducedashotandcoldworkedsheet,strip,rod,wireandtube,a
6、ndisavailableinthehot-workedorprocessannealedconditionforthedeepdrawingofsheet,butthestrengthislow.Thistypeofsteelisusedforthemanufactureofmotorcarbodies,refrigerators,washingmachines,officefurniture,pressings,rivetsandnails.2.Carburisingsteelscontai
7、ning0.1%to0.2%carbonThestrengthandhardnessofthesesteelsislow,butahardsurfacecanbeobtainedbycarburizinginordertocombineawear-resistantsurfacewithtoughcoreproperties.TheductilitymakesrapidmachiningdifficultunlesstheMnandScontentisincreasedbyusingashlph
8、urcontentof0.2%to0.3%withabout1%manganese.3.Constructionalmildsteelscontaining0.2%to0.3%carbonAsthecarboncontentisraisedabove0.2%,thestrengthincreasesintotherangerequiredforconstructionalpurposes,buttheductilitydecreases.Thefabricationqualities(worki
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