Numerical modeling of scanning laser-induced melting, vaporization and resolidification in metals subjected to time-dependent heat flux inputs

被引：10

作者：

Chung, H ^{[1
]}

Das, S ^{[1
]}

机构：

[1] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2004年 / 47卷 / 19-20期

基金：

美国国家科学基金会;

关键词：

laser processing; melting; vaporization; resolidification; Stefan problem;

D O I：

10.1016/j.ijheatmasstransfer.2004.05.009

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

We present a 1-D heat transfer, melting, vaporization and resolidification model describing the interaction of a scanning continuous-wave laser with a metal surface wherein the beam power is rapidly time-varying. The effects of processing parameters on process variables for linear ramp and quadratic heat flux inputs are investigated numerically by varying beam diameters, scan speeds and substrate temperatures. Relations are derived for the times to initiate melting, to initiate vaporization, to reach maximum melting depth, for melting-resolidification, and for maximum melting and vaporization depths. Surface temperatures for both heat flux inputs are compared with approximate closed form solutions. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：4165 / 4175

页数：11