Investigation the Effect of Microstructure and Crystallographic Texture on the Hydrogen Induced Cracking Resistance of HSLA Steel

Subject Areas :

shahram abbasi ¹ ( PhD student, Advanced Materials and Renewable Energy Department, Iranian Research Organization for Science and Technology, Tehran, Iran )
mohammad esmailian ² ( Associate professor, Advanced Materials and Renewable Energy Department, Iranian Research Organization for Science and Technology, Tehran, Iran )
Shahrokh Ahangarani ³ ( Associate professor, Advanced Materials and Renewable Energy Department, Iranian Research Organization for Science and Technology, Tehran, Iran )

Received: 2019-11-02 Accepted : 2020-04-18 Published : 2020-09-22

Keywords: Microstructure, HSLA steel, Crystallographic texture, HIC,

Abstract :

In this study effect of microstructure and crystallographic texture on the hydrogen induced cracking resistance of a HSLA was investigated. Samples were hot rolled between 980 to 750 °C up to 50% and quenched in different environments. Microstructure and texture of the samples were studied using a scanning electron microscope (SEM) equipped by electron backscattered diffraction detector (EBSD). Hydrogen induced cracking resistance of the samples were also evaluated using HIC test. Results revealed that, by increasing cooling rate more non-equilibrium phases with finer grain where formed. Grain boundary fraction also increased by increasing cooling rate which led to decrease in HIC resistance. Texture of the samples were also changed due to cooling rate enhancement furthermore texture intensity decreased. {111} // ND fiber intensity decreased due to cooling rate increase which led to decrease in intergranular crack propagation and consequently decrease in HIC resistance.

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