| 低合金钢焊缝金属中奥氏体晶粒尺寸计算模型的研究 |
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| 引用本文： | 王永生,黄安国,李志远.低合金钢焊缝金属中奥氏体晶粒尺寸计算模型的研究[J].电焊机,2003,33(3):1-6. |
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| 作者姓名： | 王永生 黄安国 李志远 |
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| 作者单位： | 华中科技大学材料科学与工程学院,湖北,武汉,430074 |
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| 摘 要： | 针对低合金钢焊缝金属奥氏体晶粒尺寸计算模型缺乏这一问题，通过对奥氏体晶粒长大情况的分析，从扩散的角度出发，提出并建立了基于碳原子扩散速率的低合金钢焊缝金属奥氏体晶料在连续冷却条件下长大的物理模型，进而得到了最终的奥氏体晶粒尺寸的计算模型。该模型在结合焊接热循环实际情况的基础上，充分考虑了焊缝金属中的合金元素对奥氏体晶粒长大的影响，从而可以更加准确地体现焊接条件下低合金钢焊缝金属奥氏体晶粒长大的真实情况。该模型的计算结果与试验测量结果能够符合得很好，表明了所建立的模型的有效性。
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| 关 键 词： | 低合金钢 奥氏体 计算模型 扩散 |
| 文章编号： | 1001-2303(2003)03-0001-06 |
| 修稿时间： | 2002年11月25日 |
Study on accounting model of austenite grain size in low-alloy steel weld metal |
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| WANG Yong-sheng,HUANG An-guo,LI Zhi -yuan.Study on accounting model of austenite grain size in low-alloy steel weld metal[J].Electric Welding Machine,2003,33(3):1-6. |
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| Authors: | WANG Yong-sheng HUANG An-guo LI Zhi -yuan |
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| Abstract: | Aiming at the problem that lack of mathematical models to calculate the austenite grain size of welding seam in low-alloy steel,and according to the analysis of the austenite grain growth mechanism.It established that a mathematical model of(welding seam)based upon the diffusivity of carbon(austenite grain in low-alloy steel)grows during continuous cooling condition.Based on the actual thermal cycling of welding,the effects of many alloy elements on austenite grain growth have been taken into account in this model,so it could be much more accurate to encounter with the real condition of austenite grain growth.The calculation results are in concord with reported experimental observations,which shows the effectiveness of the present model. |
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| Keywords: | low-alloy steel austenite accounting model diffusion |
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