Behavior of constitutive models from slow strain rate test of maraging 300 and 350 steels performed in several environmental conditions

With the example of stress corrosion test of natural gas pipeline steel, the application of Visual Basic (VB) language program in the test will be discussed in the paper. The result shows that different waveforms of VB language design can simulate various forms of applied load of pipeline steel well, and make fluctuant slow strain rate test more accurate and convenient.

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Determination of Stress Corrosion Cracking Resistance of Al-Cu-Mg Alloys by Slow Strain Rate and Alternate Immersion Testing

CORROSION ◽

10.5006/1.3593853 ◽

1981 ◽

Vol 37 (2) ◽

pp. 98-103 ◽

Cited By ~ 10

Author(s):

Shantanu Maitra

Keyword(s):

Strain Rate ◽

Stress Corrosion ◽

Stress Corrosion Cracking ◽

Corrosion Cracking ◽

Slow Strain Rate ◽

Test Method ◽

Slow Strain Rate Test ◽

Test Results ◽

Alloy Plate ◽

Rate Test

Abstract Increased artificial aging from the T351 temper to T851 temper is known to increase resistance to stress corrosion cracking (SCO for Al-Cu-Mg alloy 2124. A series of incrementally aged 2124 alloy plate was tested for resistance to SCC by the slow strain rate technique and by the conventional alternate immersion test method. It is shown that slow strain rate test results are in agreement with the conventional test results. Using fracture energy and other loss in ductility parameters to denote resistance to SCC, it has been shown that this technique can be used as a more accurate SCC test. SEM examinations of fracture surfaces confirm the SCC indices obtained by the slow strain rate test.

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Stress Corrosion Behavior of AISI 304 Stainless Steel in a Boiling 42% MgCl2 Solution under Cyclic Slow Strain Rate Technique

CORROSION ◽

10.5006/1.3582989 ◽

1985 ◽

Vol 41 (10) ◽

pp. 592-597 ◽

Cited By ~ 2

Author(s):

T. Nakayama ◽

M. Takano

Keyword(s):

Stainless Steel ◽

Strain Rate ◽

Stress Corrosion ◽

Slow Strain Rate ◽

304 Stainless Steel ◽

Slow Strain Rate Test ◽

Aisi 304 Stainless Steel ◽

Aisi 304 ◽

Rate Test ◽

Slow Strain Rate Technique

Abstract Stress corrosion cracking (SCC) behavior of AISI 304 stainless steel (SS) rod and plate specimens in boiling 42% MgCl2 was investigated using a monotonic and a cyclic slow strain rate technique (SSRT) in the crosshead speed (CHS) range from 6×10−5 to 1.5 mm/min. A maximum stress (σmax) of 50 to 330 MPa was selected in a cyclic slow strain rate test. A thermal cyclic stress test was also conducted in the solution. Fracture surface observations revealed that crack mode changed from transgranular to intergranular with increasing stress level in the SCC process, and the crack mode was independent of the CHS change. Time to failure in the cyclic slow strain rate test was constant at a given σmax in all CHS used (except slow CHS of 6×10−5 at σmax of 50 MPa). Crack propagation rate (da/dt) increased with the stress intensity factor, and it was independent of CHS. The corrosion potential varied with the stress cycle after cracking started; this indicated that SCC proceeded by a dissolution-repassivation mechanism. The cyclic slow strain rate test is recommended as an SCC test that can reproduce the actual service conditions of stress.

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