材料成型及控制工程专业英语-_1.MATERIALS_AND_THEIR_PROPERTIES.ppt

- * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES These eminently practical materials find applications form ball bearings to metal sheets formed into automobile bodies. 这些不同寻常的材料实际运用涉及球轴承以及金属板材制成的汽车车身。 ball bearings 球轴承 Eminently adv. 闻名的, 卓越的, 显赫的 - * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES The designation of ferrous alloys is specified by digits（阿拉伯数字） such as 10xx，11XX，12XX，15KX etc．(AISI standards，in which the first two numbers gives a code designating the type of alloying additions and the last two or three numbers give the carbon content in hundredths of a weight percent). 铁合金的(设计)牌号主要用阿拉伯数字表示为10XX, 11XX, 12XX, 15XX等。（AISI标准中，前两个数字用来表明添加合金的规定牌号，后两个数字表示碳的重量百分比。） AISI ——American Iron and Steel Institute 美国钢铁学会 - * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES As an example , the plain carbon steel with 0.40 wt％carbon is a 1040 steel，whereas a steel with 1.45 wt％Cr and l.50 wt％carbon is a 52150 steel . 例如，含0.40％C的普通碳钢，其牌号为1040钢，而含1.45％Cr和1.50C则表示为52150钢。 Cr 〈化〉铬 (chromium) - * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES One should keep in mind that chemical compositions quoted in alloy designations are approximate(近似的) and will vary slightly from product to product within acceptable limits of industrial quality control. 我们应该记住，合金牌号中的化学成分是近似值，在工业质量控制可接受的范围内，产品之间的(成分)范围有细微差别。 Quote vt. 引用, 引证, 提供, 提出, 报(价) “quoted……”acted as attribute. - * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES An interesting class of alloys known as high strength low alloy(HSLA) steels has emerged in response to requirements for weight reduction of vehicles. The composition of many commercial HSLA steels are proprietary and specified by mechanical properties rather than composition. 为了满足汽车减重要求而出现了高级高强度低合金钢。许多商用HSLA钢是根据其性能尤其是机械性能而不是成分来确定的。 - * - CHAPTER 1 MATERIALS AND THEIR PROPERTIES But typical example might contain 0.2 wt% carbon and about 1.0wt% or less of such elements as Mn, Si, Cr, W, Ni or Mo. 但是典型的HSLA钢包含0.2wt％C，Mn、Si、Cr、W、Ｎi．Ｍｎ等含量不超过1.0wt％。 Mn 锰(manganese) Cr