Display method of F/M heat resistant steel welded joint heat affected zone original austenite grain boundary

A technology of austenite grain boundaries and welded joints is applied in the field of metallographic preparation, which can solve the problems of difficulty in displaying the prior austenite grain boundaries of F/M heat-resistant steel, and achieve high repeatability, good stability and convenient operation. Effect

Active Publication Date: 2016-02-03
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for displaying the original austenite grain boundary in the heat-affected zone of the F/M heat-resistant steel welded joint, to

Method used

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  • Display method of F/M heat resistant steel welded joint heat affected zone original austenite grain boundary
  • Display method of F/M heat resistant steel welded joint heat affected zone original austenite grain boundary
  • Display method of F/M heat resistant steel welded joint heat affected zone original austenite grain boundary

Examples

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Effect test

Embodiment 1

[0028] This example shows the grain boundaries of prior austenite in the uncoarser region of 9Cr2WVTa steel.

[0029] The chemical composition of 9Cr2WVTa steel is (wt.%): C0.14%, Cr9.04%, W1.99%, V0.25%, Ta0.17%, Mn0.45%, and the balance is Fe. On the Gleeble1500 thermal simulation test machine, the welding thermal cycle with the peak temperature of 1315 ° C and 1315 ° C was used to obtain the unrefined coarse-grained zone structure.

[0030] 1. First cut the sample of the heat-affected zone of the welded joint that has not become coarse grained, and place one of the planes of the sample on 240#, 400#, 600#, 800#, 1000#, 2000# metallographic sandpaper from coarse to Grind finely. Before changing the sandpaper each time, ensure that there is no scratch on the surface of the sample perpendicular to the polishing direction. After changing the sandpaper, rotate the sample 90° for the next polishing until the scratch left by the previous one is removed. After grinding, use navy w...

Embodiment 2

[0034] This example shows the grain boundaries of the original austenite in the supercritical coarse-grained region of 9Cr2WVTa steel.

[0035] The chemical composition of 9Cr2WVTa steel is (wt.%): C0.14%, Cr9.04%, W1.99%, V0.25%, Ta0.17%, Mn0.45%, and the balance is Fe. The supercritical coarse-grained zone microstructure was obtained through welding heat cycles with peak temperatures of 1315°C and 1100°C on a Gleeble1500 thermal simulator.

[0036] 1. First, cut the sample of the heat-affected zone of the welded joint over the critical coarse-grained zone, and place one of the planes of the sample on 240#, 400#, 600#, 800#, 1000#, 2000# metallographic sandpaper from coarse to Grind finely. Before changing the sandpaper each time, ensure that there is no scratch on the surface of the sample perpendicular to the polishing direction. After changing the sandpaper, rotate the sample 90° for the next polishing until the scratch left by the previous one is removed. After grinding,...

Embodiment 3

[0040] This example shows the grain boundaries of prior austenite in the critical coarse grain region of 9Cr2WVTa steel.

[0041] The chemical composition of 9Cr2WVTa steel is (wt.%): C0.14%, Cr9.04%, W1.99%, V0.25%, Ta0.17%, Mn0.45%, and the rest is Fe. The critical coarse-grained zone microstructure was obtained through welding heat cycles with peak temperatures of 1315°C and 970°C on a Gleeble 1500 thermal simulator.

[0042] 1. First cut the sample of the critical coarse-grained zone in the heat-affected zone of the welded joint, and place one of the planes of the sample on 240#, 400#, 600#, 800#, 1000#, 2000# metallographic sandpaper from coarse to fine For polishing, ensure that there are no scratches on the surface of the sample perpendicular to the polishing direction before changing the sandpaper each time. After changing the sandpaper, rotate the sample 90° for the next polishing until the scratches left by the previous one are removed. After grinding, use navy wool...

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Abstract

The invention discloses a display method of an F/M heat resistant steel welded joint heat affected zone original austenite grain boundary, and belongs to the technical field of preparation of metallographic samples. The F/M heat resistant steel is 9-12% Cr ferrite martensite heat resistant steel. The original austenite grain boundary can be observed through a microscope after a polished sample is subjected to chemical thermal etching by virtue of a chemical hot corrosion liquid (supersaturated picric acid-Seagull brand shampoo-hydrochloric acid). According to the display method, the operation is convenient, the repeatability is high, the stability is good, the original austenite grain boundary can be clearly and completely displayed, and reference is provided for analyzing the grain evolution in a heat affected zone after weld thermal cycle.

Description

technical field [0001] The invention relates to the technical field of metallographic preparation, in particular to a method for displaying the original austenite grain boundary in the heat-affected zone of an F / M heat-resistant steel welded joint. Background technique [0002] 9-12%Cr ferritic martensitic heat-resistant steel, as a candidate material for fourth-generation nuclear power, is attracting the interest of researchers. Since the structural materials need to undergo welding process in the actual production process, the traditional arc welding method will inevitably produce coarse-grained structures in the heat-affected zone. Coarse austenite grains tend to degrade the overall performance of welded joints and are prone to premature failure in coarse grained areas. For this reason, it is particularly important to analyze the grain coarsening in each area of ​​the heat-affected zone of the welded joint after the welding heat cycle, which is of great significance for ...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N1/34G01N33/20
Inventor 陆善平王健戎利建李殿中李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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