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A non-destructive testing method for martensite transformation in austenitic stainless steel

A technology of austenitic stainless steel and martensite transformation, applied in the direction of material magnetic variable, etc., can solve the problems of restricting the use of materials, and achieve the effects of easy portability, saving measurement costs, and convenient and fast reading

Active Publication Date: 2018-07-06
HEFEI GENERAL MACHINERY RES INST +1
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Problems solved by technology

[0003] Generally, most body-centered cubic metal materials increase in strength and decrease in toughness as the temperature decreases. When the temperature drops to the ductile-brittle transition temperature, the toughness suddenly decreases and is in a brittle state, which limits the use of this type of material at low temperatures.

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  • A non-destructive testing method for martensite transformation in austenitic stainless steel

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments.

[0021] Since both deformation and low temperature environment can induce martensitic transformation, both of these factors are taken into consideration in the detection method. The invention can be applied to austenitic stainless steel materials whose temperature can be as low as the liquid helium temperature of -269 DEG C and whose deformation amount is less than 15% in the actual application process for non-destructive rapid detection.

[0022] ①Measure the content of ferromagnetic α′-martensite in austenitic stainless steel with a ferrite meter, and record the value as x;

[0023] ② Then, the martensite transformation amount in austenitic stainless steel is calculated through the following functional relationship:

[0024] f(x)=1.67x+1.48;

[0025] In the above fo...

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Abstract

The invention discloses a non-destructive detection method for martensite transformation in austenitic stainless steel. The phase transformation products of austenitic stainless steel are paramagnetic ε-martensite and ferromagnetic α′-martensite. For austenitic stainless steel materials with a deformation of less than 15%, the specific steps of the detection method are as follows: first, measure the content of ferromagnetic α′-martensite in austenitic stainless steel with a ferrite meter, and record the value as x; Then, through the following functional relationship, the martensite transformation in austenitic stainless steel is obtained: f(x)=1.67x+1.48; in the above formula: f(x) is the martensite transformation, including ε- The total content of martensite and α′-martensite; x is the content of α′-martensite measured by ferrite meter. In practical application, the present invention can accurately and quickly calculate the value of the martensite transformation in austenitic stainless steel, which saves the measurement time and cost of the enterprise, and also lays a foundation for the application of austenitic stainless steel materials in low temperature environments .

Description

technical field [0001] The invention belongs to the technical field of stainless steel, and in particular relates to a nondestructive detection method for martensite transformation in austenitic stainless steel. Background technique [0002] With the rapid development of the national economy, cryogenic technology has penetrated into various scientific and technological fields and has become an important part of cutting-edge science. Extreme cryogenic conditions frequently appear in key fields such as aerospace, petrochemical, energy, and medical care. [0003] Generally, most body-centered cubic metal materials increase in strength and decrease in toughness as the temperature decreases. When the temperature drops to the ductile-brittle transition temperature, the toughness suddenly decreases and is in a brittle state, which limits the use of this type of material at low temperatures. Austenitic stainless steel with a face-centered cubic crystal structure has excellent low-te...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/72
Inventor 孔韦海陈学东范志超吕运容张强胡盼
Owner HEFEI GENERAL MACHINERY RES INST
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