Study on Tensile and Creep Property of Thermal Recovery Wellhead Material 30CrMo

doi:10.3901/JME.2020.22.112

Abstract

Abstract: In view of the evaluation of the service life of the thermal recovery wellhead in the oil field, the tensile and creep property of 30CrMo are studied. The tensile properties at room temperature and 390℃ are obtained by tensile test; The creep tests of the material at 390℃ and five different stresses are carried out. The Norton Bailey equation is used to fit the test data, and the creep constitutive equations of low stress zone and high stress zone are obtained; Scanning electron microscope and transmission electron microscope are used to observe the original samples and five samples after creep. It is found that when the material is kept at 390℃ for a long time, the diffusion of carbon element in the crystal result in the increase of carbide quantity and particle size on the matrix, resulting in the decrease of the strength of the material. The mechanism of creep microstructure change of 30CrMo in low stress zone and high stress zone is different. The creep mechanism in low stress zone is dominated by dislocation thermal climbing, and the mechanism in high stress zone is dominated by Orowan winding.

Key words: thermal recovery wellhead material 30CrMo, tensile property, creep property, Norton-Bailey equation, creep test

CLC Number:

TE38

CAO Xuxiang, YAN Tingjun, LI Pengpeng, WANG Tingyi, LI Feng. Study on Tensile and Creep Property of Thermal Recovery Wellhead Material 30CrMo[J]. Journal of Mechanical Engineering, 2020, 56(22): 112-119.

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