Low-alloy-steel macroscopic fracture blue brittleness processing technology

Abstract

A disclosed low-alloy-steel macroscopic fracture blue brittleness processing technology comprises performing heat treatment on an entrusted sample, performing machine tooling and press breaking, and then performing blue brittleness processing. The heat treatment technology for low-alloy-steel fracture blue brittleness is exploited. The heating temperature, the warm-keeping time, the putting method, the heating equipment and structure morphological analysis are determined, and the blue brittleness effect reaches an optimum state, thereby improving the accuracy for grading macroscopic inclusions.

Description

technical field [0001] The invention relates to a low-magnification fracture brittle process method of low-alloy steel, which belongs to the technical field of steel fracture inspection. Background technique [0002] Steel-iron-testing standard (SEP 1584): Blue brittleness test is to detect the presence of non-metallic impurities on the cross-section of deformed steel products. These impurities can be seen without magnifying tools (length > 1.5mm, width > 0.05mm) , heating it to the blue-temper color at about 330° C. in the temperature range of the blue-temper color. [0003] The national standard only provides the theoretical blue embrittlement temperature, but the heat treatment process and blue embrittlement effect are not described in detail. For a long time, experimenters can only achieve the blue crisp effect through years of experience and increasing the amount of experiments. Even so, it is unclear what the best blue crisp effect should be. In order to meet t...

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Problems solved by technology

For a long time, experimenters can only achieve the blue crisp effect through years of experience and increasing the amount of experiments. Even so, it is unclear what the best blue crisp effect should be

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