Effect of Creep on Prediction Accuracy and Calculating Efficiency of Residual Stress in Post Weld Heat Treatment

doi:10.11900/0412.1961.2019.00208

Acta Metall Sin

2019, Vol. 55

Issue (12): 1581-1592 DOI: 10.11900/0412.1961.2019.00208

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Effect of Creep on Prediction Accuracy and Calculating Efficiency of Residual Stress in Post Weld Heat Treatment

LU Shijie,WANG Hu,DAI Peiyuan,DENG Dean(

)

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China

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LU Shijie, WANG Hu, DAI Peiyuan, DENG Dean. Effect of Creep on Prediction Accuracy and Calculating Efficiency of Residual Stress in Post Weld Heat Treatment. Acta Metall Sin, 2019, 55(12): 1581-1592.

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Abstract

Low alloy high strength steel, owing to its good mechanical properties and low cost, is widely used in bridge, building, pressure vessel and other engineering structures. Steel structures will inevitably produce residual stress and deformation after welding with the characteristics of concentrated heat source and local heating. Heat treatment is recognized as an effective method to eliminate the residual stress after welding. However, there is no quantitative and systematic study on the mechanism of heat treatment to eliminate residual stress when numerical simulation method is used to study post weld heat treatment (PWHT). Meanwhile, creep is an important factor in the process of PWHT on low alloy high strength steel. It is necessary to study the influence of creep on residual stress prediction so as to develop a simplified creep model used in practice more efficiently. Based on MSC. Marc software platform, a thermal-elastic-plastic finite element method (T-E-P FEM) considering creep effect is developed. The stress field during welding and PWHT of Q345 remelting joint was simulated by the integrated calculation method. The effect of creep on welding residual stress during PWHT was emphatically studied. Based on the results of numerical simulation, the mechanism of eliminating residual stress by PWHT was explored. At the same time, the residual stresses of welded and heat treated joints were measured by blind-hole method, and the results were compared with those of numerical simulation. In addition, the effect of two different creep models on the calculation accuracy of residual stress in PWHT is also discussed. A simple and efficient creep model suitable for engineering application is proposed for Q345 low alloy high strength steel. The results show that the residual stresses obtained by numerical simulation agree well with the experimental values, which verifies the validity of the integrated calculation method developed. It is necessary to consider creep effect in the process of PWHT, otherwise the residual stress after heat treatment will be seriously overestimated. By using the simple creep model proposed, the calculation efficiency could be increased by about 10 times with less loss of calculation accuracy.

Key words: residual stress post weld heat treatment (PWHT) creep numerical simulation

Received: 27 June 2019

ZTFLH:

TG404

Fund: National Natural Science Foundation of China(No.51875063)

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	LU Shijie
	WANG Hu
	DAI Peiyuan
	DENG Dean

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https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00208 OR https://www.ams.org.cn/EN/Y2019/V55/I12/1581

Fig.1 Shape and dimension of mock-up (a) and picture of mock-up (b)

Fig.2 Thermal cycle curve of post weld heat treatment (PWHT) process

Fig.3 The locations of residual stress measurements on top surfaces(a) as weld (b) PWHT

Fig.4 Temperature-dependent thermal-physical^[20] (a) and mechanical^[21] (b) properties of Q345 steel

Fig.5 3D FEM model (FEM—finite element method)

Table 1 Simulation cases

Fig.6 Contours of longitudinal residual stress distribution (top) and stress distribution near weld of central section (bottom) from four different computing cases(a) Case A (as-weld) (b) Case B (as-weld and heat treatment)(c) Case C (as-weld and heat treatment with holding creep) (d) Case D (as-weld and heat treatment with all creep)

Fig.7 Contours of transverse residual stress distribution (top) and stress distribution near weld of central section (bottom) from four different computing cases(a) Case A (b) Case B (c) Case C (d) Case D

Fig.8 Longitudinal (a) and transverse (b) residual stress along L1 line in Fig.1a after welded (Case A)

Fig.9 Longitudinal (a) and transverse (b) residual stress along L1 line in Fig.1a (Case B, Case C and Case D)

Fig.10 Longitudinal residual stress of point A (in Fig.1a) during heat treatment

Fig.11 Varieties of elastic strain (a), plastic strain (b) and creep strain (c) with time at point A (in Fig.1a) during heat treatment

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