Method for determining mechanical constitutive parameters of nickel-series low-temperature steel containing film-shaped metastable austenite

A technology for parameter determination and austenite, which is applied in the field of determination of mechanical constitutive parameters of nickel-based low-temperature steels, can solve problems such as small size, difficult two-phase constitutive parameters, and continuous evolution of metastable austenite volume fraction.

Active Publication Date: 2021-06-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the thin-film metastable austenite and tempered martensite in nickel-based low-temperature steels are small in size, the volume fraction of metastable austenite is constantly evolving due to the TRIP e

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  • Method for determining mechanical constitutive parameters of nickel-series low-temperature steel containing film-shaped metastable austenite
  • Method for determining mechanical constitutive parameters of nickel-series low-temperature steel containing film-shaped metastable austenite
  • Method for determining mechanical constitutive parameters of nickel-series low-temperature steel containing film-shaped metastable austenite

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[0111] Below in conjunction with accompanying drawing and specific embodiment content of the present invention is described in further detail:

[0112] For the flow diagram of the method for determining the mechanical constitutive parameters of nickel-based low-temperature steel containing film-like metastable austenite (9Ni steel sample is used in this embodiment), refer to the attached figure 1 ,Specific steps are as follows:

[0113] 1) Obtain the compressive stress-strain curve of single-phase martensitic microcolumns

[0114] 1.1) The 9Ni steel sample was kept at 900°C for 1 hour, then water-cooled and quenched, and then kept at 550°C for 30 hours;

[0115] 1.2) The volume fraction of metastable austenite measured by X-ray diffractometer method is 7.2%;

[0116] 1.3) Use the focused ion beam to process the sample after heat treatment to produce micron columns containing only single-phase martensite, and the diameter of the micron column is 1-2 μm, the height is 3-5 μm, ...

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Abstract

The invention provides a method for determining mechanical constitutive parameters of nickel-based low-temperature steel containing film-shaped metastable austenite, and solves the problems that the film-shaped metastable austenite and tempered martensite in the current nickel-based low-temperature steel are small in size, the volume fraction of the metastable austenite evolves continuously due to the TRIP effect, and the two-phase constitutive parameters are difficult to measure independently by using the existing method. The method comprises the following steps: firstly, processing a single-phase martensite micron column on a nickel-based low-temperature steel sample, obtaining a compression stress-strain curve of the micron column, and determining constitutive parameters of a martensite phase; then, obtaining a stress-strain curve of a martensite and metastable austenite dual-phase structure through a uniaxial tensile experiment, and meanwhile, obtaining a curve of volume fraction evolution of metastable austenite along with strain; and finally, simulating the stretching process of the martensite and metastable austenite double-phase structure by utilizing crystal plasticity, comparing the simulated and experimental stress-strain curves with the evolution curve of the volume fraction of the metastable austenite along with the strain, and determining constitutive parameters of the metastable austenite phase.

Description

technical field [0001] The invention belongs to the technical field of characterization of mechanical properties of materials, and relates to a method for determining the mechanical constitutive parameters of nickel-based low-temperature steel containing thin-film metastable austenite. Background technique [0002] Natural gas is an important energy pillar for the development of today's society. Generally, the storage and transportation efficiency of natural gas is improved by liquefying natural gas. Due to its extremely low temperature (-162.5°C), liquefied natural gas puts forward strict requirements on storage tank materials. Nickel-based low-temperature steel is widely used in liquefied natural gas, Manufacturing process of cryogenic storage tanks such as liquefied petroleum gas. However, the price of nickel is expensive and fluctuates greatly, which greatly increases the manufacturing cost of LNG storage tanks; therefore, the development of the next generation of nicke...

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Application Information

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IPC IPC(8): G06F30/17G06F30/20G06F17/11G06F119/14
CPCG06F30/17G06F30/20G06F17/11G06F2119/14
Inventor 陈豫增张文祥丛钰斌李聪刘峰
Owner NORTHWESTERN POLYTECHNICAL UNIV
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