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Martensite aging stainless steel dendritic crystal corrodent and corrosion method

A technology of stainless steel and martensite, which is applied in the field of maraging stainless steel dendrite corrosion agent and corrosion, can solve the problems of complex configuration method, unsatisfactory erosion effect, and inability to clearly display dendrite morphology, etc., to achieve simple formula, The effect of simple operation steps

Inactive Publication Date: 2020-02-04
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent document CN 109295456A discloses a dendrite corrosion solution for precipitation strengthening martensitic stainless steel and its application method. The method requires many kinds of medicines, the configuration method is relatively complicated, and the erosion effect is not ideal, so it is not suitable for martensitic stainless steel. The dendrite erosion of the aging stainless steel slab cannot clearly display the dendrite morphology, which is not conducive to the measurement of dendrite spacing and the evaluation of element segregation between dendrite stems and interdendritic elements by energy spectroscopy

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  • Martensite aging stainless steel dendritic crystal corrodent and corrosion method
  • Martensite aging stainless steel dendritic crystal corrodent and corrosion method
  • Martensite aging stainless steel dendritic crystal corrodent and corrosion method

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Embodiment 1

[0031] This embodiment selects a PH13-8Mo as-cast sample, and the main components of the steel are shown in Table 1.

[0032] Table 1 Chemical composition of PH13-8Mo steel

[0033] C Si mn P S Cr Mo Ni Al 0.045 0.019 0.024 0.0057 0.0025 12.58 2.23 8.16 1.1

[0034] (1) Prepare the sample: cut the above-mentioned cast sample, mechanically grind one plane of the sample on 180#, 500#, and 1000# sandpaper, and then polish it with 2.5μ diamond polishing paste until it is scratch-free Rinse and dry after scratching;

[0035] (2) Preparation of corrosion solution: take 50ml of analytically pure nitric acid with a mass fraction of 65-68%, add 50ml of deionized water, stir gently with a glass rod, and configure it as a 50% aqueous solution of nitric acid by volume;

[0036] (3) Sample corrosion: at normal temperature, the polished sample is carried out electrolytic etching, with the stainless steel sheet as the cathode, the sample as the anode, t...

Embodiment 2

[0040] In this embodiment, a PH13-8Mo as-cast sample is selected, and the main components of the steel are shown in Table 2.

[0041] Table 2 Chemical composition of PH13-8Mo steel

[0042] C Si mn P S Cr Mo Ni Al 0.04 0.057 0.108 0.009 0.0032 12.8 2.3 8.05 1.1

[0043] (1) Prepare the sample: cut the above-mentioned cast sample, mechanically grind one plane of the sample on 180#, 500#, and 1000# sandpaper, and then polish it with 2.5μ diamond polishing paste until it is scratch-free Rinse and dry after scratching;

[0044] (2) Preparation of corrosion solution: take 40ml of analytically pure nitric acid with a mass fraction of 65-68%, add it to 60ml of deionized water, stir gently with a glass rod, and configure it as an aqueous solution of nitric acid with a volume fraction of 40%;

[0045] (3) Sample corrosion: at normal temperature, the polished sample is carried out electrolytic etching, with the stainless steel sheet as the cathode,...

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Abstract

The invention relates to a martensite aging stainless steel dendritic crystal corrodent and corrosion method, and belongs to the technical field of metallographic analysis of iron and steel. The corrodent provided by the invention is an analytical pure nitric acid aqueous solution, which is prepared from an analytical pure nitric acid and water. The dendritic crystal corrosion method comprises thesteps of: a. cutting an as-cast sample for grinding and polishing; b. preparing the dendritic crystal corrodent; and c. using a stainless steel sheet as a cathode, using the sample as an anode, and placing the as-cast sample in the corrodent to perform electrolytic etching at room temperature. The corrodent provided by the invention has a simple formula, simple operation steps, and clear and accurate detection results of dendritic crystal corrosion, data such as interdendritic spacing can be accurately calculated through clear morphology of the dendritic crystal, and segregation degrees between dendritic crystals and dendritic crystal stems can be measured by using an energy spectrum for evaluating quality of the as-cast structures and assisting in evaluating the elimination of dendriticsegregation by the homogenization heat treatment.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallographic analysis, and in particular relates to a maraging stainless steel dendrite corrosion agent and a corrosion method. Background technique [0002] PH13-8Mo maraging stainless steel is a new type of high-strength stainless steel with high strength, high hardness and excellent corrosion resistance. It can be used in aerospace, nuclear reactor and petrochemical industries. In actual production, molten steel tends to produce dendrite segregation during the solidification process. The higher the degree of alloying, the easier the grain segregation characteristics will be left in the rolled material, which will affect the mechanical and corrosion properties of the finished product. Therefore, the corresponding dendrite Detection technology is critical. By observing the solidified dendrite structure of the slab, measuring the primary and secondary dendrite spacing, etc. to judge the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/204G01N23/2251G01N23/2202G01N23/20091G01N23/2005G01N1/32
CPCG01N1/32G01N23/2005G01N23/20091G01N23/2202G01N23/2251G01N33/204
Inventor 白青青张志宏
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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