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Preparation method for work softening low-carbon steel

A technology of low carbon steel and carbon content, which is applied in the field of metal materials and can solve the problems of reduced toughness and other issues

Active Publication Date: 2018-12-14
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been found that when low carbon steel is subjected to hot rolling, quenching and ECAP treatment respectively, ECAP grain refinement is better than solution treatment and phase transformation treatment, and the material strengthening effect is better than quenching [Materials and Design, 65(2015), 115- 119,]; The grain size of 0.18% C steel was refined to 400μm by increasing the rolling speed, and the strength was increased from 350GMp to 810GMp, but the toughness of the steel was significantly reduced [Materials Letters, 160(2015), 213-217]

Method used

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  • Preparation method for work softening low-carbon steel
  • Preparation method for work softening low-carbon steel
  • Preparation method for work softening low-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Select 15 low-carbon steel, the weight percentage of its chemical composition is: C 0.13%, Si 0.08%, Mn 0.13%, P0.01%, S0.004%, the balance is Fe, heated to 920 ° C for 1 hour, after Quenching with 10% sodium chloride in ice water to obtain lath martensite; cold rolling at room temperature, the deformation amount is 80%, and its structure is C supersaturated deformed ferrite lath arranged in parallel; tempering at 400°C to obtain pancake Shaped grain low carbon steel plate.

[0022] Such as figure 1 As shown, 1 is the curve of the prepared low carbon steel, which decreases in strength with the increase of strain after the yield point, and has the characteristics of work softening; as a comparison, 2 is the curve of the same low carbon steel in annealed state, and the strength increases with the strain after the yield point Increased height, a classic work hardening feature.

[0023] Such as figure 2 As shown, a) the metallographic structure of the steel plate side, ...

Embodiment 2

[0028] Choose No. 15 low-carbon steel, the weight percentage of its chemical composition is: C 0.13%, Si 0.08%, Mn 0.13%, P 0.01%, S 0.004%, the balance is Fe, heated to 920 ° C for 1 hour, after 10 % sodium chloride ice water quenching to obtain lath martensite, cold rolling at room temperature, the deformation amount is 80%, and its structure is parallel arrangement of C supersaturated deformed ferrite lath, tempering at 200 ° C to obtain pancake-shaped crystal grain low carbon steel plate.

[0029] Measure the tensile stress-strain curve at room temperature, such as Figure 4 Its mechanical properties are shown in Table 2.

[0030] Table 2 Mechanical properties of 15 steel quenched-80% deformation-200℃ tempering

[0031]

Embodiment 3

[0033] Choose No. 15 low-carbon steel, the weight percentage of its chemical composition is: C 0.13%, Si 0.08%, Mn 0.13%, P 0.01%, S 0.004%, the balance is Fe, heated to 920 ° C for 1 hour, after 10 % sodium chloride ice water quenching to obtain lath martensite, cold rolling at room temperature, the deformation amount is 80%, and its structure is C supersaturated deformed ferrite lath arranged in parallel, tempering at 300 ° C to obtain pancake-shaped crystal grain low carbon steel plate.

[0034] Measure the tensile stress-strain curve at room temperature, such as Figure 5 Its mechanical properties are shown in Table 3.

[0035] Table 5 Mechanical properties of 15 steel quenched - 80% deformation - 300 ℃ tempering

[0036]

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Abstract

The invention relates to a preparation method for work softening low-carbon steel. The preparation method mainly comprises the steps that the common low-carbon steel with the carbon content being 0.13%-0.21% is adopted, heat preservation is carried out at 30 DEG C for 1 h on Acl, the common low-carbon steel is placed into 10% sodium chloride ice water for quenching to obtain lath martensite, roomtemperature cold rolling is carried out, the deformation is 75%-80%, and the structure is parallel C supersaturated deformation lath ferrite; and tempering is carried out at 200 DEG C-400 DEG C, and apancake-shaped grain low-carbon steel plate is obtained. The preparation method is simple, the low-carbon steel indoor temperature stress-strain curve shows the work softening characteristic, the structure is pancake-shaped C supersaturated deformation ferrite grains, and the strength and the ductility are both higher than those of the quenching-tempering state same low-carbon steel.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a method for preparing metal materials. technical background [0002] Metal materials generally exhibit work hardening behavior when deformed at room temperature. Under certain conditions, a small number of single crystal metals have room temperature (low temperature) process softening. [0003] Polycrystalline engineering materials such as steel and non-ferrous metal alloys generally have work hardening characteristics. When the material is deformed at room temperature, the grain shape changes, the dislocation density increases, and the hardness and strength increase. Its stress-strain curve continues to rise in a parabolic shape after the yield point, and the fracture strength is determined according to the highest point of the curve, which is generally higher than the yield strength. For example, the yield strength of 304LN stainless steel at room temperature is abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D8/02C22C38/02C22C38/04C22C38/22
CPCC21D1/18C21D8/0236C21D8/0247C21D2211/005C22C38/02C22C38/04C22C38/22
Inventor 张静武门浩杨猛缑慧阳赵一博李慧李晗景子毅王思涵王金萍
Owner YANSHAN UNIV
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