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

《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