Method for improving mechanical property of 45Cr-3Mo-B alloy

A technology of alloy mechanics and properties, applied in the field of improving the mechanical properties of 45Cr-3Mo-B alloy, can solve the problems of complex structure and no unified conclusion of strengthening mechanism, so as to improve the surface fatigue limit, prevent the phenomenon of partial load, and ensure the assembly The effect of precision

Inactive Publication Date: 2015-12-30
罗伟
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Problems solved by technology

[0002] The strengthening mechanism of steel includes dislocation strengthening, crystal structure strengthening and solid solution strengthening. Due to the complexity of its structure, there is no unified conclusion on the strengthening mechanism of martensitic steel.

Method used

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  • Method for improving mechanical property of 45Cr-3Mo-B alloy
  • Method for improving mechanical property of 45Cr-3Mo-B alloy

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] Table 145Cr-3Mo-B steel chemical composition (mass fraction) (%)

[0010]

[0011] (2) Heat treatment process Divide the samples into two groups, one group is conventional heat treatment, its process is 850 ° C x 13 min oil quenching + 600 ° C * 2 h oil cooling; the other group is sub-temperature quenching heat treatment, its process is 850 ° C x 13 min oil Quenching+600℃xZh oil cooling+770℃x13min water quenching+600℃xZh water cooling. A quenching and tempering treatment (that is, pretreatment) is required before sub-temperature quenching, because sub-temperature quenching of steel has certain requirements on the original structure, and it is necessary to ensure that there are fine acicular ferrite precipitates with a certain orientation in order to improve the impact. tenacity.

[0012] (3) Hardness test The samples after conventional heat treatment and sub-temperature quenching heat treatment were made into samples, and the hardness test was carried out on a HR150...

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Abstract

The invention discloses a method for improving the mechanical property of 45Cr-3Mo-B alloy. The method is characterized by comprising the steps that the 45Cr-3Mo-B alloy is prepared from, by mass, 0.41 part of C, 0.24 part of Si, 0.67 part of Mn, 0.93 part of Cr, 0.021 part of S, 0.023 part of P and the balance Fe; steel is prepared by the raw materials through a conventional method and then processed through subcritical quenching heat treating; the technology comprises the steps that oil quenching is performed at the temperature of 750 DEG C-850 DEG C for 13 min; oil cooling is performed at the temperature of 550 DEG C-600 DEG C for 2 h; water quenching is performed at the temperature of 700 DEG C-770 DEG C for 13 min; water cooling is performed at the temperature of 560 DEG C-600 DEG C for 2 h.

Description

technical field [0001] The invention relates to a method for improving the mechanical properties of 45Cr-3Mo-B alloy through sub-temperature quenching. Background technique [0002] The strengthening mechanism of steel includes dislocation strengthening, crystal structure strengthening and solid solution strengthening. Due to the complexity of its structure, there is no unified conclusion on the strengthening mechanism of martensitic steel. Fine-grain strengthening will improve the strength and toughness of steel, but the understanding of the "grain size" that plays a role in the strength and toughness of martensitic steel is not very clear. The world type is considered by some to be the slat bundle size, by others the slat size. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for improving the mechanical properties of the 45Cr-3Mo-B alloy, which improves the mechanical properties of the 45Cr-3Mo-B allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/18C22C38/18
Inventor 罗伟
Owner 罗伟
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