《材料科学英语》PPT课件.ppt

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1、HubeiUniversityofAutomotiveTechnologySpecialtyEnglish1、语法较为简单，多用被动语态，从句等。2、专有名词多，有规律可循（构词法）（读音较为复杂，无规律）3、写作要求清晰明了如何学习？（1）记忆常见科技词汇（构词法）（2）多阅读科技文章，学习如何用英语表达。避免自创的新奇语句。（3）课后练习翻译，写作（Practicemakesperfect.）★CharacteristicsofSpecialtyEnglishChapter1MaterialsandHeatTreatment◆Re

2、adingandanswerquestionsThenewwordsyoumaybemeet:metallic金属的corrosion腐蚀ductile延展ballbearing滚珠轴承multiphase多相wrought加工的，精细的malleable可锻的有延展性的FerrousAlloysArbitrary专横的，独断的，任意的Smelt熔炼，精炼Intricate复杂的，精巧的Combination结合，合并，化合物FerrousAlloysMorethan90%byweightofthemetallicmaterialsu

3、sedbyhumanbeingsareferrousalloys.Thisrepresentsanimmensefamilyofengineeringmaterialswithawiderangeofmicrostructureandrelatedproperties.FerrousAlloysThemajorityofengineeringdesignsthatrequirestructuralloadsupportorpowertransmissioninvolveferrousalloys.asapracticalmatter,

4、thesealloysfallintotwobroadcategoriesbasedonthecarboninthealloycomposition.FerrousAlloysSteelgenerallycontainsbetween0.05wand2.0wcarbon.Thecastironsgenerallycontainbetween2.0wand4.5wcarbon.Withinthesteelcategory,weshalldistinguishwhetherornotasignificantamountofalloying

5、elementsotherthancarbonisused.对于钢的区分，我们要弄清楚的是是否含有有效量的合金元素而不是碳的含量。FerrousAlloysFerrousAlloysAcompositionof5wtotalnoncarbonadditionswillserveasanarbitraryboundarybetweenlowalloyandhighalloysteels.FerrousAlloysThesealloyadditionsarechosencarefullybecausetheyinvariablybring

6、withthemsharplyincreasedmaterialcosts.TheyarejustifiedonlybyessentialimprovementsinpropertiessuchashigherstrengthorimprovedcorrosionresistancequestionsHowdoyoudistinguishsteelfromcastiron?Howdoyoudistinguishlowalloysteelfromhighalloysteel?1.1.1IronandSteelTheearthcontai

7、nsalargenumberofmetalswhichareusefultoman.Oneofthemostimportantoftheseisiron.Modernindustryneedsconsiderablequantitiesofthismetal,eitherintheformofironorintheformofsteel.1.1.1IronandSteelAcertainnumberofnon-ferrousmetals,includingaluminumandzinc,arealsoimportant,buteven

8、todaythemajorityofourengineeringproductsareofironorsteel.Moreover,ironpossessesmagneticproperties,whichhavemad