High temperature tensile properties and fracture mechanism of P110H steel

doi:10.13251/j.issn.0254-6051.2020.04.043

Abstract

Abstract: Referring to the service temperature of thermal recovery wells, the tensile test of P110H thermal recovery casing steel at high temperature was carried out. Then the fracture morphology at different temperatures was observed, and the fracture mechanism changes caused by temperature were analyzed. The results show that the yield strength of P110H steel decreases significantly with temperature increasing, while the tensile strength decreases slightly, and the yield strength ratio decreases with temperature increasing. Under the influence of high temperature, the fracture process changes from the combined fracture process of shear extension fracture induced by microporous polymerization to the ductile fracture process dominated by microporous polymerization. The main reason is that the activation energy of materials increases the plastic deformation ability of materials due to high temperature.

Key words: thermal recovery casing, P110H steel, tensile properties, fracture analysis, fracture mechanism

CLC Number:

TG142.1

Zhao Lin, Yang Junhu, Wei Wenlan, Ma Hai, Xue Yang, Ma Lijuan. High temperature tensile properties and fracture mechanism of P110H steel[J]. Heat Treatment of Metals, 2020, 45(4): 204-208.

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