英语翻译1.Introduction 1.1 General overview of laser cladding The purpose of a cladding operation is to deposit one or several layers of a certain materialonto a substrate,in such a way that a sound interfacial bond is formed,without significant

英语翻译1.Introduction 1.1 General overview of laser cladding The purpose of a cladding operation is to deposit one or several layers of a certain materialonto a substrate,in such a way that a sound interfacial bond is formed,without significant
英语翻译
1.Introduction
1.1 General overview of laser cladding
The purpose of a cladding operation is to deposit one or several layers of a certain material
onto a substrate,in such a way that a sound interfacial bond is formed,without significant dilution
of one into the other.The goal of this process is to obtain an improvement in surface properties,
usually chemical (e.g.corrosion or high temperature oxidation resistance) and/or mechanical (e.g.
wear resistance).Other applications include Direct Metal Deposition,In-situ Repair and Rapid
Prototyping/Manufacturing.
In laser cladding the beam acts as the heat source.At the laser irradiated zone,the clad
material must be brought together with the substrate and these are to undergo melting,so that a
metallurgical bond forms between the two materials.For this purpose,one possibility is to
preplace the powder on top of the substrate.However,the most common procedure is the blown
powder method,in which the cladding material is delivered to the substrate in the form of a powder
that is injected into the laser melting pool with the help of a carrier gas.
Insight of the complex phenomena taking place during laser cladding is of great importance
in order to effectively control the process and eventually optimize it.Heat and momentum carrying
solid particles are transported by an inert gas through a properly designed nozzle and blown into a
melting pool.This melt is mainly composed of previously deposited film material,but inevitably
some substrate material is also present:in the beginning stages a melt pool has to be formed in the
substrate,so that the powder catchment efficiency of the surface is high enough to allow for the
formation of a continuous strip of clad material.

英语翻译1.Introduction 1.1 General overview of laser cladding The purpose of a cladding operation is to deposit one or several layers of a certain materialonto a substrate,in such a way that a sound interfacial bond is formed,without significant
介绍
激光喷镀的概述
该喷镀法的目的是将一层或几层的某种金属覆盖（电镀）到基底上,该方法的优点是材料间不用过分稀释（咬蚀）,就可获得高质量的界面间的结合力,可大大提高表面性能（防腐蚀,抗氧化,耐磨损）,其他特点有,直接金属喷镀,局部修补（补镀层脱落部分）,还可提高成品生产效率,激光束作为热源,在激光覆盖区域,经过熔化,两种材料（涂料与镀件）成为一体,为了达到这个目的,可能要提前给镀件涂上镀粉,然而,最主要的程序是喷粉的方法,在这个过程中喷涂材料是以粉状借助空气喷到激光熔化池内,为了有效控制喷涂过程,获得满意效果,喷涂过程中要保持密切观察,加热后的固体粒子是由一种惰性气体经过专用喷嘴输送的一个熔化池内,这种熔化材料主要是提前覆盖在镀件上的金属膜,但不可避免的在熔化池开始形成阶段含有一些镀件材料的成分, 使得镀件有足够的吸附力,形成连续的涂膜,