界面换热系数对淬火过程变形模拟影响的敏感性分析

程柏松; 肖纳敏; 李殿中; 李依依

doi:10.3724/SP.J.1037.2012.00152

金属学报 >

2012 , Vol. 48 >Issue 6: 696 - 702

DOI: https://doi.org/10.3724/SP.J.1037.2012.00152

论文

界面换热系数对淬火过程变形模拟影响的敏感性分析

程柏松 ,
肖纳敏 ,
李殿中 ,
李依依

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中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳 110016

程柏松, 男, 1981年生, 博士生

收稿日期: 2012-03-26

修回日期: 2012-04-30

网络出版日期: 2012-06-11

基金资助

国家科技重大专项资助项目2011ZX04014-052

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SENSITIVITY ANALYSIS OF THE EFFECT OF INTERFACIAL HEAT TRANSFER COEFFICIENT ON DISTORTION SIMULATION DURING QUENCHING

CHENG Bai-Song ,
XIAO Na-Min ,
LI Dian-Zhong ,
LI Yi-Yi

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Shenyang National Laboratory for Materials Sciences, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2012-03-26

Revised date: 2012-04-30

Online published: 2012-06-11

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摘要

对316不锈钢C型环和纵切圆柱2种试样在水冷淬火过程中发生的热处理变形进行了计算机模拟和实验研究. 结果表明: 温度场的精确测量对综合界面换热系数的逆运算结果具有重要影响, 并进一步影响热处理变形的模拟预测. 采用低采集频率数据逆运算得到的界面换热系数, 在温度变化剧烈的高温阶段偏低, 致使变形模拟结果严重失真. 采用高采集频率逆运算得到的界面换热系数, C型环和纵切圆柱试样变形的模拟结果均与实验结果吻合较好.高温阶段界面换热系数对材料的屈服行为的计算结果影响很大, 是影响变形结果的主要原因. 较大的界面换热系数将使材料在较高温度时即进入屈服状态, 并且处于屈服状态的温度范围也较大, 更容易发生塑性变形以及引发刚性运动. 淬火变形的模拟结果对高温段界面换热系数的变化较为敏感, 而对低温段的变化不敏感.

关键词： 界面换热系数; 模拟; 热处理; 变形

本文引用格式

程柏松 , 肖纳敏 , 李殿中 , 李依依 . 界面换热系数对淬火过程变形模拟影响的敏感性分析[J]. 金属学报, 2012 , 48(6) : 696 -702 . DOI: 10.3724/SP.J.1037.2012.00152

Abstract

The distortions of C-ring and cut cylinder of austenitic stainless steel after water quenching were investigated using simulation and experiment methods. The results indicated that the accurate measurement of temperature had a major influence on interfacial heat transfer coefficient (IHTC) which is calculated using the inverse analysis method. The sparse data of the high temperature stage due to low sampling frequency resulted in the lower value of IHTC. The simulated distortion during water quenching was mostly decided by the change of IHTC. The simulation results showed that the trend and magnitude of distortion predicted by the IHTC_H (calculated from the data of high sampling frequency) agreed better with the experiments than that by the IHTC_L (calculated from the data of low sampling frequency). The further analysis showed that the IHTC at high temperature had the great influence on the calculated yield behavior of materials. The high values of IHTC caused that the work piece kept in the yield status at higher temperature and wider temperature range. So the simulation using the IHTC_H predicted more serious plastic deformation and larger rigid movement. Further analysis showed that the simulation result of distortions was sensitive to the variation of IHTC at the high temperature stage, while insensitive to the variation at the low temperature stage.

Key words： interfacial heat transfer coefficient; simulation; heat treatment; distortion

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