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Non-destructive detection method for martensite change amount in austenite stainless steel

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

Active Publication Date: 2015-08-05
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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  • Non-destructive detection method for martensite change amount in austenite stainless steel

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Embodiment Construction

[0020] In order to make the objectives, technical solutions 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 will induce martensitic transformation, both of these inducements are considered in the detection method. The invention can be applied to austenitic stainless steel materials whose temperature can be as low as -269°C of liquid helium temperature and whose deformation amount is less than 15% in 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 the value is recorded as x;

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

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

[0025] In the above formula:

[0026] f(x) i...

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Abstract

The present invention discloses a non-destructive detection method for the martensite change amount in an austenite stainless steel, wherein the phase change products of the austenite stainless steel are paramagnetic epsilon-martensite and ferromagnetic alpha'-martensite, and based on the austenite stainless steel material with the deformation amount of less than 15%, the detection method specifically comprises that the ferromagnetic alpha'-martensite content in the austenite stainless steel is measured through a ferrite meter and the value is recorded as x, and the martensite change amount in the austenite stainless steel is obtained through the following function relation formula f(x)=1.67x+1.48, wherein the f(x) is the martensite change amount and includes the total content of the epsilon-martensite and the alpha'-martensite, and x is the alpha'-martensite content measured through the ferrite meter. With the method of the present invention, the value of the martensite change amount in the austenite stainless steel can be accurately and rapidly calculated in the practical application, such that the measurement time and the measurement cost of the enterprise are saved, and the foundation is established for the application of the austenite stainless steel material in the low temperature environment.

Description

Technical field [0001] The invention belongs to the technical field of stainless steel, and in particular relates to a non-destructive detection method for the transformation amount of martensite in austenitic stainless steel. Background technique [0002] With the rapid development of the national economy, cryogenic technology has penetrated into various fields of science and technology and has become an important part of cutting-edge science. Extreme cryogenic conditions frequently appear in key areas such as aerospace, petrochemical, energy, and medical. [0003] Generally, most body-centered cubic metal materials increase in strength and decrease 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-temper...

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Application Information

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Patent Type & Authority Applications(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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