焊接残余应力对接头尘化腐蚀影响的有限元模拟

胡桂明; 周昌玉; 张国栋; 陈成; 雷娜

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焊接残余应力对接头尘化腐蚀影响的有限元模拟

胡桂明, 周昌玉, 张国栋, 陈成, 雷娜

文章导航 > 焊接学报 > 2009 > (1): 42-46

胡桂明, 周昌玉, 张国栋, 陈成, 雷娜. 焊接残余应力对接头尘化腐蚀影响的有限元模拟[J]. 焊接学报, 2009, (1): 42-46.

引用本文:

胡桂明, 周昌玉, 张国栋, 陈成, 雷娜. 焊接残余应力对接头尘化腐蚀影响的有限元模拟[J]. 焊接学报, 2009, (1): 42-46.

HU Guiming, ZHOU Changyu, ZHANG Guodong, CHEN Cheng, LEI Na. Finite element simulation on the effect of welding residual stress on the metal dusting corrosion of welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (1): 42-46.

Citation:

HU Guiming, ZHOU Changyu, ZHANG Guodong, CHEN Cheng, LEI Na. Finite element simulation on the effect of welding residual stress on the metal dusting corrosion of welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (1): 42-46.

焊接残余应力对接头尘化腐蚀影响的有限元模拟

南京工业大学, 机械与动力工程学院, 南京 210009

基金项目: 国家自然科学基金项目资助(50675096)

Finite element simulation on the effect of welding residual stress on the metal dusting corrosion of welded joint

School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China

摘要: 金属尘化腐蚀是发生在含碳气氛中的一种高温腐蚀现象,碳在金属基体中的扩散是其过程的第一步.文中开发了碳扩散的耦合计算程序,进行了加热炉炉管焊态和工况温度状态下焊接残余应力对碳扩散影响的数值模拟,并与无应力状态下的碳扩散情况进行了比较.结果表明,在热影响区附近焊接残余应力梯度最大,对碳扩散的影响也最大,并且形成一个碳浓度峰值,在峰值两侧则会形成相应的碳浓度低谷,这是碳向高应力梯度区扩散所致.经过升温至工况温度后,残余应力得到松弛,对碳扩散的影响有所降低,可以延缓炉管的损坏时间.但由于残余应力的影响仍然存在,因此在炉管检修期间要注意焊接接头附近的尘化腐蚀情况。
- 金属尘化 /
- 高温腐蚀 /
- 耦合 /
- 焊接残余应力 /
- 有限元模拟
Abstract: Metal dusting is a phenomenon of high temperature corrosion, which occurs in carburizing environment. The first step of this corrosion is the diffusion of carbon towards metal matrix. A coupling calculating method on carbon diffusion has been developed based on the finite element program. By this method, the effect of welding residual stress on the carbon diffusion was numerically simulated for the as-welded condition and operation condition of the tube in heating furnace. The diffusion without the effect of stress was also taken into account and compared with those under residual stress. The results show that the highest welding residual stress gradient is near the heat-affected zone(HAZ), and the peak value of carbon concentration exists near this zone. Also the low carbon concentration valley exists at the both sides of the peak value, which is caused by the diffusion of carbon to the high stress zone. In operation conditions, stress relaxation will happen and the effect of residual stress is decreased, which can delay the metal dusting corrosion of the tube. But the influence of the residual stress still exists, the zone near the weld of the tube should be inspected carefully during the inspection period.
- metal dusting /
- high temperature corrosion /
- coupling /
- welding residual stress /
- finite element simulation

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焊接残余应力对接头尘化腐蚀影响的有限元模拟

南京工业大学, 机械与动力工程学院, 南京 210009

基金项目: 国家自然科学基金项目资助(50675096)

收稿日期: 2008-01-31

关键词:

耦合 /

摘要: 金属尘化腐蚀是发生在含碳气氛中的一种高温腐蚀现象,碳在金属基体中的扩散是其过程的第一步.文中开发了碳扩散的耦合计算程序,进行了加热炉炉管焊态和工况温度状态下焊接残余应力对碳扩散影响的数值模拟,并与无应力状态下的碳扩散情况进行了比较.结果表明,在热影响区附近焊接残余应力梯度最大,对碳扩散的影响也最大,并且形成一个碳浓度峰值,在峰值两侧则会形成相应的碳浓度低谷,这是碳向高应力梯度区扩散所致.经过升温至工况温度后,残余应力得到松弛,对碳扩散的影响有所降低,可以延缓炉管的损坏时间.但由于残余应力的影响仍然存在,因此在炉管检修期间要注意焊接接头附近的尘化腐蚀情况。

English Abstract

Finite element simulation on the effect of welding residual stress on the metal dusting corrosion of welded joint

School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China

Received Date: 2008-01-31

Keywords:

Abstract: Metal dusting is a phenomenon of high temperature corrosion, which occurs in carburizing environment. The first step of this corrosion is the diffusion of carbon towards metal matrix. A coupling calculating method on carbon diffusion has been developed based on the finite element program. By this method, the effect of welding residual stress on the carbon diffusion was numerically simulated for the as-welded condition and operation condition of the tube in heating furnace. The diffusion without the effect of stress was also taken into account and compared with those under residual stress. The results show that the highest welding residual stress gradient is near the heat-affected zone(HAZ), and the peak value of carbon concentration exists near this zone. Also the low carbon concentration valley exists at the both sides of the peak value, which is caused by the diffusion of carbon to the high stress zone. In operation conditions, stress relaxation will happen and the effect of residual stress is decreased, which can delay the metal dusting corrosion of the tube. But the influence of the residual stress still exists, the zone near the weld of the tube should be inspected carefully during the inspection period.

胡桂明, 周昌玉, 张国栋, 陈成, 雷娜. 焊接残余应力对接头尘化腐蚀影响的有限元模拟[J]. 焊接学报, 2009, (1): 42-46.

引用本文:

胡桂明, 周昌玉, 张国栋, 陈成, 雷娜. 焊接残余应力对接头尘化腐蚀影响的有限元模拟[J]. 焊接学报, 2009, (1): 42-46.

Citation:

HU Guiming, ZHOU Changyu, ZHANG Guodong, CHEN Cheng, LEI Na. Finite element simulation on the effect of welding residual stress on the metal dusting corrosion of welded joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (1): 42-46.