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Numerical simulation of mechanical controlling
parameters for Type IV cracking on the welding joints of martensitic
heat-resistant steel |
| Jian-Qiang ZHANG1,Bing-Yin YAO2,Tai-Jiang LI2,Fu-Guang LIU2,Ying-Lin ZHANG3, |
| 1.State Key Lab of Advanced
Welding Production Technology, Harbin Institute of Technology, Harbin
150001, China；School of Power and
Mechanical Engineering, Wuhan University, Wuhan 430072, China; 2.Xi’an Thermal
Power Research Institute Co., Ltd, Xi’an 710032, China; 3.School of Power and
Mechanical Engineering, Wuhan University, Wuhan 430072, China; |
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Abstract The maximum principal stress, von Mises equivalent stress and equivalent creep strain in the welding joint of martensitic heat-resistant steel (9Cr1MoVNb) are simulated by finite-element method (FEM) under the condition of 600°C and applied stress of 80 MPa. The results show that the maximum principal stress and von Mises equivalent stress are high on the curved points of two sides of the groove face near the fine-grain heat-affected zone (HAZ). The creep strain mainly concentrates in the fine-grain HAZ; the maximum creep strain locates in the bottom of fine-grain HAZ of specimen. The stress triaxiality in the fine-grain HAZ is maximum, and creep cracking occurs because of the intensive constrain of base metal and weld. The simulation result is good in agreement with those of crack initiation site and propagation path by using the stress triaxiality as the mechanical controlling parameter of weld joint of martensite heat-resistant steel. Therefore, it is reasonable that the stress triaxiality is used for analysis initiation and propagation of Type IV cracking in the fine-grain HAZ.
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| Keywords
martensitic heat-resistant steel
Type IV cracking
von Mises equivalent stress
equivalent creep strain
numerical simulation
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Issue Date: 05 June 2010
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