孙瑜
,
赵志刚
,
周银
,
杨子润
,
王树奇
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2014.06.007
采用高温磨损试验机对TC11合金和H13钢进行了各种温度和载荷下的磨损试验,对比研究了它们的磨损行为.研究发现,随温度和载荷的变化,TC11合金和H13钢表现出完全不同的磨损行为.随着温度升高,TC11合金的磨损率在200℃时增加,然后大幅度降低,在400～600℃达到最低值.而H13钢的磨损率先降低,在200℃达到最低值,随后显著增加,在400～600℃出现从轻微至严重磨损的转变.其行为差异是由于氧化物的保护作用和两种材料热软化抗力的不同而引起的.
关键词:
钛合金
,
钢
,
磨损行为
,
摩擦氧化物
,
热软化
L. W Zhang
,
R.S. Wang
,
J. Th.M.De Hosson
,
Y.L. Xia and F. G. Wang 1) The State Key Lab. for Materials Modification by Laser
,
Ion and Electron Beams
,
Dalian University of Technology
,
Dalian 116023
,
China 2) Department of Applied Physics
,
University of Groningen
,
The Netherlands
金属学报(英文版)
A three-dimensional transient heat transfer model for laser transformation hardening process has been developed in this paper. The finite size of the laser treated sample, the surface heat loss of the sample, the latent heat of phase transformation and the temperature dependence of thermal properties of materials were considered. The heat source was considered as a moving Gaussian heat flux with a constant velocity. Three-dimension unequally spatial grid explicit finite difference equations, alternating direction implicit finite difference equations and implicit finite difference equations were deduced respectively. Three programs to calculate the temperature field were developed using Fortran language. The transient temperature fields of C22, 42CrMo, C60 steel samples during laser transformation hardening process were calculated using these programs, and the widths and depths of laser transformation hardening zones were also predicted. C22, 42CrMo, C60 steel samples were treated by CO_2 laser,the widths and depths of laser transformation hardening zones of these samples were also measured experimentally. The calculated widths and depths of laser transformation hardening zones are in good agreement with the experimental results.
关键词:
temperature field
,
null
,
null
