Test specimen for high-temperature strength and notch sensitivity of welding seam

A high-temperature strength and sensitivity technology, applied in the field of material science, can solve the problems of fracture in the heat-affected zone, inability to know the lateral properties of the weld metal, and difficult to measure the real properties of the weld metal, achieving great social benefits and Economical, simple processing effect

Inactive Publication Date: 2012-08-15
NORTHEAST POWER SCI RES INSTITUTION +2
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] For the weld, the test section should include the weld, the heat-affected zone and the base metal. Since the metal strength of the weld is much higher than that of the base metal and the heat-affected zone, especially for P91 steel welds, conventional tensile specimens are generally broken at In the weld heat affected zone, the measured strength of the welded joint is actually the strength of the weld heat affected zone, but the real properties of the weld metal are difficult to measure
The weld performance of high-temperature and high-pressure steam pipelines in power

Method used

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  • Test specimen for high-temperature strength and notch sensitivity of welding seam
  • Test specimen for high-temperature strength and notch sensitivity of welding seam
  • Test specimen for high-temperature strength and notch sensitivity of welding seam

Examples

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Example Embodiment

[0022] Example 1:

[0023] The present invention is a test sample for the high temperature strength of the weld and its notch sensitivity, such as figure 2 As shown, the sample 9 of the present invention is the same as the conventional long-lasting sample, with thick ends at both ends and a thin structure in the middle; the two ends are the clamping ends 2, the middle is the test section 1, and the two ends are clamping ends 2. The direction toward the middle test section 1 is a smooth transition section that is recessed inward, and a gap 3 is provided in the middle of the test section 1.

[0024] The test sample for the weld performance of the notched sample of the present invention has the same test operation steps as the conventional high-temperature long-term tensile test method. The difference lies in the sample preparation, such as figure 2 As shown, the sample of the present invention is a long plate type, the two ends are the same as the conventional permanent sample, the ...

Example Embodiment

[0027] Example 2:

[0028] A rectangular cross-section P91 welding seam sample is used. The size of the test section sample is 7×3mm, and the notch is on the welding seam. The opening depth is 2mm and the opening width is 2mm. The test temperature is 540℃, the test stresses at the notches of the four specimens are 364MPa, 350MPa, 290MPa, and 250MPa, respectively, and the break times of the specimens are 0, 20, 1582, and 9600 hours, respectively. Figure 4 to Figure 6 Shown.

[0029] A rectangular cross-section P91 base material sample is used. The cross-sectional size of the test section sample is 7×3mm, the notch is in the middle of the test section, the opening depth is 2mm, and the opening width is 2mm. The test temperature is 540°C, the test stresses at the notches of the two specimens are 350MPa and 250MPa, respectively, and the break times of the specimens are 10 and 4220 hours, respectively.

[0030] It can be seen from comparison that the fracture time of P91 weld specimens...

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Abstract

The invention relates to a test specimen for high-temperature strength and notch sensitivity of a welding seam and belongs to the technical field of material science. The test specimen comprises an elongated specimen which is thick at both ends and thinner in the middle, wherein the two ends are clamping ends and the middle is a test section; an inwardly recessed smooth transition section is arranged in the direction from the clamping ends on the two ends of the specimen to the middle test section, and a notch is arranged on the test section. According to the invention, since a variable cross-section notch is added to the specimen, the specimen can be broken in the weld metal, the welding seam metal strength and the sensitivity of the notch to the welding seam can be tested, and the problems that the welding seam strength and the welding seam notch sensitivity and the like cannot be tested by the traditional specimen can be solved. The specimen is simple to process, and the test process is basically the same with the conventional tension test method. The test specimen fills in the gap in the technical field and has great social and economic benefits.

Description

technical field [0001] The invention relates to a test sample of weld seam high-temperature strength and its notch sensitivity, belonging to the technical field of material science. Background technique [0002] With the development of my country's electric power industry, many high-parameter and large-capacity thermal power units have been put into operation one after another. High-temperature and high-pressure steam pipes in power stations are widely used in high-alloy steel, such as P91, P92, etc. The strength and safety of the weld seams of these high-alloy steel steam pipes , reliability and service life have always been a matter of great concern to domestic and foreign design, manufacture, operation, maintenance, supervision and inspection personnel. With the long-term operation at high temperature, the safety problem of weld metal has become increasingly prominent. It is mainly manifested in the decrease of its high-temperature strength and the sensitivity of the weld...

Claims

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Application Information

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IPC IPC(8): G01N3/02
Inventor 张艳红
Owner NORTHEAST POWER SCI RES INSTITUTION
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