Standard Test Method for Measurement of Hydrogen Embrittlement Threshold in Steel by the Incremental Step Loading Technique

Importancia y uso:

5.1 This test method is used for research, design, service evaluation, manufacturing control, and development. This test method quantitatively measures stress parameters that are used in a design or failure analysis that takes into account the effects of environmental exposure including that which occurs during processing, such as plating (8) (ASTM STP 962).

5.2 For plating processes, the value of σ_th-IHE is used to specify quantitatively the maximum operating stress for a given structure or product.

5.3 For quality control purposes, an accelerated test is devised that uses a specified loading rate, which is equal to or lower than the loading rate necessary to determine the threshold stress (see 8.1).

5.4 For fasteners, the value of σ_th-IHE is used to specify quantitatively the maximum stress during installation and in service to avoid premature failure caused by residual hydrogen in the steel as a result of processing.

5.5 For fasteners, the value of σ_th-EHE is used to specify quantitatively the maximum stress during installation and in service to avoid failure from hydrogen absorbed during exposure to a specific environment.

5.6 To measure the relative susceptibility of steels to hydrogen pickup from various fabrication processes, a single, selected, discriminating rate is used to rank the resistance of various materials to hydrogen embrittlement.

5.7 Annex A1 describes the application of this standard test method to hydrogen embrittlement testing of fasteners.

Subcomité:

F07.04

Referida por:

F2078-22, F2833-11R17, F2660-20, F3019_F3019M-19, F3043-23, F1136_F1136M-11R19, F3393-24, F0519-23, F3111-23, F1941_F1941M-16, E0488_E0488M-22, F1940-07AR24, F0606_F0606M-24

Volúmen:

15.03

Número ICS:

77.040.10 (Mechanical testing of metals)

Palabras clave:

decreasing loading rate; delayed brittle failure; displacement control; fasteners; hydrogen embrittlement threshold; hydrogen induced stress cracking; rising step load; slow strain rate;