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Metal material with improved low-temperature property and method for manufacturing same

A technology for metal materials and low-temperature characteristics, which is applied in the field of metal materials and their manufacturing to improve low-temperature characteristics, can solve the problems of simultaneously increasing strength and fracture toughness limitations, increasing manufacturing costs, and reducing applicability, so as to achieve high cost and improve low-temperature characteristics , the effect of reducing costs

Inactive Publication Date: 2016-07-20
KOREA INST OF IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the case of improving the low-temperature characteristics of the material through the development of the alloy elements or heat treatment methods, the problem is that due to the internal characteristics of the material itself, there is a limit to simultaneously improving the strength and fracture toughness, and even if it is improved, the effect is very little. Increased manufacturing costs due to increased process and decreased applicability in various fields

Method used

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  • Metal material with improved low-temperature property and method for manufacturing same
  • Metal material with improved low-temperature property and method for manufacturing same
  • Metal material with improved low-temperature property and method for manufacturing same

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Embodiment

[0043] figure 1 It is a graph for explaining the temperature-stress of the ductile-brittle transition according to an embodiment of the present invention.

[0044] Generally, if the metal material is compressed by cold rolling or cold forging, then the figure 1 In the temperature-stress diagram shown, the yield strength curve moves to the right (σY1→σY2), the brittle strength line moves downwards (σB1→σB2), and the ductile-brittle transition temperature (DBTT; ductile-brittle transition temperature) ) Move from location (1) to location (2) and increase.

[0045] However, according to an embodiment of the present invention, the metal material with improved low-temperature characteristics, figure 1 As the yield strength curve shown moves to the right (σY1→σY2), the brittle strength line moves sharply upward (σB1→σB3), and the deflection-brittle transition temperature (DBTT) moves from point (1) to specific point (1). ) Moves to a low-temperature location (3), so that the strength and...

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Abstract

The present invention relates to a metal material with an improved low-temperature property and a method for manufacturing the same, and the metal material is capable of being safely used at a low temperature by inducing a ductile fracture through an increase in fracture toughness at a low temperature. According to one embodiment of the present invention, provided are a metal material with an improved low-temperature property, in which at least one notch is recessed on a surface thereof and at least one fine crack is processed at a lower end of the notch that intersects with the notch in a notch width direction, and a method for manufacturing the same.

Description

Technical field [0001] The present invention relates to a metal material and a manufacturing method thereof. In more detail, it relates to a metal material with improved low-temperature characteristics and a manufacturing method thereof. The metal material is guided by ductile fracture by increasing its fracture toughness at low temperature. It can be used safely at low temperatures. Background technique [0002] Generally, it is suitable for parts of equipment, ships, vehicles, etc. used in severe cold or polar regions, or equipment or parts used under low temperature conditions. The most important thing is to require materials with high low-temperature fracture toughness, which can resist at low temperatures. Tensile strength and yield strength increase, elongation and area shrinkage show larger values ​​at room temperature, and become smaller as the temperature decreases. This means that the ductility decreases as the temperature decreases. [0003] Low temperature brittleness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D28/02C21D7/00C21D10/00
CPCC21D7/00B21D28/02C21D10/00
Inventor 金秉俊南大根曹亨镐
Owner KOREA INST OF IND TECH
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