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Method for regulating and controlling segregation and matrix performance difference in bainite steel and steel workpiece
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A technology of bainitic steel and bainite transformation, applied in the field of steel workpiece preparation, can solve problems such as uneven performance and adverse effects on the performance of steel workpieces
Active Publication Date: 2022-07-01
YANSHAN UNIV
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This uneven performance will also have a negative impact on the performance of the subsequent steel workpieces.
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Embodiment 1
[0080] A steel plate, the main chemical components of the matrix are: C: 0.30, Si: 1.40, Mn: 1.58, Cr: 1.13, Ni: 0.45, Mo: 0.40, and the rest are Fe and impurities; the composition of the segregation part is C: 0.33 , Si: 1.68, Mn: 3.12, Cr: 1.66, Ni: 0.70, Mo: 0.65, and the rest are Fe and impurities. The Ms temperature at the matrix position was 320°C, and the Ms temperature at the segregation portion was 225°C. The steel plate was heated to 930 °C for 1 h, rapidly cooled to 310 °C, held for 5 minutes, and then heated to 340 °C and held for 60 minutes. At this time, the matrix structure has completed the bainite transformation, and the bainite transformation degree of the segregation part is 40 %, then cooled to room temperature, and finally tempered at 320 °C. After testing, the hardness of the matrix is 460HV, the hardness of the segregation part is 470HV, and the retained austenite content of the segregation part is 35%. After conventional isothermal treatment at 340°...
Embodiment 2
[0082] A steel plate, the main chemical components of the matrix are: C: 0.18, Si: 1.10, Mn: 1.80, Cr: 0.92, Ni: 0.52, Mo: 0.30, and the rest are Fe and impurities; the composition of the segregation part is C: 0.23 , Si: 1.38, Mn: 3.51, Cr: 1.22, Ni: 0.75, Mo: 0.43, and the rest are Fe and impurities. The Ms temperature of the matrix was 352°C, and the Ms temperature of the segregation part was 240°C. The steel plate was heated to 900°C for 0.5h, rapidly cooled to 335°C, held for 5 minutes, and then heated to 365°C and held for 45 minutes. At this time, the matrix structure has completed the bainite transformation, and the bainite transformation degree of the segregation part is 55%, then cooled to room temperature and finally tempered at 300°C. After testing, the hardness of the matrix position is 420HV, the hardness of the segregation position is 432HV, and the retained austenite content of the segregation position is 33%. After conventional air-cooling treatment, the har...
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Abstract
The invention provides a method for regulating and controlling segregation and matrix performance difference in bainite steel and a steel workpiece, the method comprises the steps that a to-be-treated steel material is obtained, the to-be-treated steel material comprises a matrix and a segregation part, and the segregation part is the segregation part of the to-be-treated steel material; the steel material to be treated is subjected to first heat treatment, so that the martensite content generated by a base body of the steel material to be treated is higher than the martensite content of a segregation part of the steel material to be treated; and second heat treatment is conducted on the to-be-treated steel material till bainite transformation of a base body of the to-be-treated steel material is completed, and the uniformity of the performance of the steel material is improved through the method.
Description
technical field [0001] The invention relates to the technical field of steel workpiece preparation, in particular to a method for regulating segregation and poor matrix properties in bainitic steel and a steel workpiece. Background technique [0002] Segregation is a phenomenon in which the chemical composition is not uniform due to insufficient redistribution and diffusion of solute elements during the solidification of steel. In general, the larger the size of the steel material used to form the steel workpiece and the higher the alloying element content, the more severe the segregation. The segregation is usually band-like, and the band-like segregation that occurs in the steel material is usually called a segregation band. In bainitic steel, since the content of alloying elements at the segregation strip is significantly higher than that in the matrix region, the strength of the segregation strip of the steel material is higher than that of the matrix, and the brittlene...
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