Data of Slow Strain Rate Tensile Test(Chengxinag Yu )

Published: 19 October 2018| Version 1 | DOI: 10.17632/cds8b2mm4y.1
Contributor:
xingfa wang

Description

These data are for the stress corrosion cracking data of X70 pipeline steel in the South China Sea mud containing sulfate-reducing bacteria. Among these data, the stress corrosion cracking behavior of X70 pipeline steel under the synergistic effect of different sulfate reducing bacteria growth days and different strain rates. These data are presented in an Origin form.

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The optical density method was used to determine the growth and metabolism of SRB in the sea mud simulation solution. First, the mud system was configured without SRB as the reference solution. The SRB that had been cultured for 4 d were injected into the simulated solution and cultured for 1–14 d in the incubator at a constant temperature of (30±1) °C. The simulated solution was then measured in turn from the first day. The 3 mL simulated solution was extracted at a time to perform absorbance measurement at the maximum characteristic absorption wavelength of 415 nm at the range of UV visible light. The average value of three parallel test experiments was used as the number of SRB. Then, the growth curve of the SRB is drawn. In order to ensure that the temperature of the SRB growth environment is not changed, the normal metabolism of the SRB during the experiment is maintained, a “stress-electrochemical corrosion test device”is specially manufactured [26]. The schematic diagram of the device is shown in Figure 3. The device is based on the existing WDML-3 SSRT test platform. A cryogenic temperature bath is used to maintain a constant ambient temperature. A removable sealed box is installed to provide an anaerobic environment. The detachable sealed box is composed of two layers: the inner layer is filled with the test corrosion medium, and the outer layer is equipped with a constant-temperature water bath. The stress corrosion test system is used to stress the metal sample and the relevant parameters such as load, displacement and time were recorded. Prior to the experiment, a 400 N preload was applied to the specimen to eliminate the gap between the clamp and reduction gear. In this study, the experimental temperature was controlled to be 30 °C. Nitrogen was flown throughout the experiment to ensure that the test was conducted in an anaerobic environment. At the end of the experiment, SEM and EDS were performed using JSM-6360LA to analyze the fracture morphology and chemical composition of the specimen.