科技英语4.3.ppt

普通热处理 normal heat treatment 1.淬火 hardening / quenching 2.回火 tempering 3.退火 annealing 表面热处理 surface heat treatment 1.氰化 cyaniding 2.渗氮 nitriding 3.渗碳 carburization 科技英语的特点  基本概念 钢的热处理（heat treatment of steel） 普通热处理 normal heat treatment 1.淬火 hardening/quenching 2.回火 tempering 3.退火 annealing 表面热处理 surface heat treatment 1.氰化 cyaniding 2.渗氮 nitriding 3.渗碳 carburization * * Heat Treatment of Steel 钢的热处理 科技英语 英语谚语一则 The early bird catches the worm. 早起的鸟儿有虫吃。 英语知识小点滴 建军节 Army Day August .1 教师节 Teachers’ Day Sept.1 国庆节 National Day October.1 课前小知识 Heat Treatment of Steel 钢 的 热 处 理 Heat treatment is a method by which the heat-treater can change the physical properties of a metal. There are three main operations in the heat treatment of steel: hardening, tempering, and annealing. Heat Treatment of Steel—钢的热处理 译文：热处理是热处理工人用来改变金属物理性能的方法。对钢进行热处理可采用三种主要的操作：淬火、回火和退火。 heat-treater ：n.热处理工人 1.热处理的含 义 和 分 类 harden vi. 淬火 temper vi. 回火 anneal vi. 退火 The hardening operation consists of heating the steel above its critical range and then quenching it, that is rapidly cooling in a suitable medium such as water, brine , oil, or some other liquid. Heat Treatment of Steel—钢的热处理 译文：淬火处理是指将钢材加热到其临界区之上，然后降温—即在适当的介质如水、盐水、油或其它液体中使之迅速冷却。 critical range：临界区 quenching 2. 淬 火 hardening quench：v. 淬火、熄灭 brine：n.盐水 Heat Treatment of Steel—钢的热处理 consists of 组成，构成，包括，由…组成 1.The United Kingdom consists of Great Britain and Northern Ireland. 联合王国包括大不列颠与北爱尔兰。 2.His job consists of helping old people who live alone. 他的工作包括帮助无人照顾的独居老人。 3.Substances consist of small particles called molecules. 物质是由叫做分子的微粒组成的。 Heat Treatment of Steel—钢的热处理 Having been hardened , the metal must be given a tempering treatment which consists of reheati