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Method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control

A low-temperature impact and martensite technology, which is applied in the field of improving low-temperature impact energy of 17-4PH maraging stainless steel forgings based on structure control, improving low-temperature impact energy of 17-4PH maraging stainless steel forgings, and can solve the problem of unclear direction and other problems to achieve the effect of eliminating directionality and improving low temperature impact energy

Pending Publication Date: 2019-03-08
JIANGYIN HENGYE FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the existing problems in improving the low-temperature impact energy of 17-4PH maraging stainless stee

Method used

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  • Method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control
  • Method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control
  • Method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control

Examples

Experimental program
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Example Embodiment

[0024] Example one.

[0025] Such as figure 1 Shown.

[0026] A high and low temperature impact energy 17-4PH maraging stainless steel forging, its chemical composition (in mass percentage %): carbon (C) 0.040, chromium (Cr) 15.25, nickel (Ni) 4.75, copper (Cu) 3.35, manganese (Mn) 0.65, niobium (Nb) + tantalum (Ta) 0.3, silicon (Si) 0.30, titanium (Ti) 0.025, molybdenum (Mo) 0.15, aluminum (Al) 0.010, nitrogen (N) 0.040, phosphorus (P) 0.020, sulfur (S) 0.015, the balance is iron (Fe), the sum of each component is 100%. Its forging process is forging heating (forging billeting) temperature ≤ 1200℃, forging deformation adopts three upsetting and three drawing, total forging ratio is 5; its heat treatment process is two solid solution + aging heat treatment, of which the first solid solution + aging The treatment process is: solid solution at 1050°C, air cooling until the core temperature of the forging is below the martensite transformation starting temperature (Ms point), over-a...

Example Embodiment

[0028] Example two.

[0029] Such as figure 2 , 3 Shown.

[0030] figure 2 It is the metallographic structure before forging with positive pressure applied along the direction perpendicular to the longitudinal direction of the elongated high-temperature ferrite. image 3 It is the metallographic structure after forging with positive pressure along the direction perpendicular to the length of the long strip high-temperature ferrite. By forging along the direction perpendicular to the length of the long high-temperature ferrite in the 17-4PH maraging stainless steel forging, the long high-temperature ferrite is upset and its directionality is effectively eliminated. Significantly improve the low-temperature impact energy.

Example Embodiment

[0031] Example three.

[0032] A high and low temperature impact energy 17-4PH maraging stainless steel forging, its chemical composition (in mass percentage %): carbon (C) 0.030, chromium (Cr) 15.00, nickel (Ni) 4.50, copper (Cu) 3.20, manganese (Mn) 0.80, niobium (Nb) + tantalum (Ta) 0.45, silicon (Si) 0.35, titanium (Ti) 0.030, molybdenum (Mo) 0.20, aluminum (Al) 0.015, nitrogen (N) 0.050, phosphorus (P) 0.030, sulfur (S) 0.020, the balance is iron (Fe), the sum of each component is 100%. Its forging process is forging heating (forging billeting) temperature ≤ 1200℃, forging deformation adopts three upsetting and three drawing, total forging ratio is 6; its heat treatment process is two solid solution + aging heat treatment, of which the first solid solution + aging The treatment process is: solid solution at 1050°C, air cooling until the core temperature of the forging is below the martensite transformation starting temperature (Ms point), over-aging at 650°C; the second sol...

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Abstract

A method for improving low-temperature impacting power of 17-4 PH maraging stainless steel forged piece based on organization control is characterized in that due to chemical component optimization, the total content of high-temperature ferrite generated in the steel material smelting process is reduced; then by controlling a reasonable forging and heating temperature, a deformation quantity and adeformation direction, the high-temperature ferrite in the smelting process is broken; long strip shape high-temperature ferrite can be forged in the direction perpendicular to the length direction of the ferrite, and is upset, and the directivity of the ferrite is effectively eliminated; finally, due to two times of solid solution and ageing heat treatment, the fine high-temperature ferrite is further eliminated in the recrystallizing process, and the low temperature impacting power is improved. According to the method, due to the fact that the long strip shape high-temperature ferrite is upset, the directivity of the ferrite is effectively eliminated, the area content of the long strip shape high-temperature ferrite is controlled at 0.6% or below, the low temperature impacting power isremarkably improved, KV2(-40 DEG C) is larger than or equal to 27 J, and the room temperature tensile strength is larger than or equal to 1000 MPa.

Description

technical field [0001] The invention relates to a method for increasing the low-temperature impact energy of maraging stainless steel forgings, especially a method for increasing the low-temperature impact energy of 17-4PH maraging stainless steel forgings, specifically a method for improving 17-4PH maraging stainless steel forgings based on structure control. 4PH Method for low temperature impact energy of maraging stainless steel forgings. Background technique [0002] 17-4PH maraging stainless steel is a kind of steel with good corrosion resistance, temperature resistance, strength and toughness, and has a large market demand. As the production process of 17-4PH maraging stainless steel gradually matures, the scope of application is expanded to work at lower temperatures, and higher requirements are put forward for its low-temperature impact energy. [0003] The low-temperature impact energy of 17-4PH maraging stainless steel is related to the content of elongated high-t...

Claims

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Application Information

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IPC IPC(8): C21D1/78C21D6/00C22C38/50C22C38/48C22C38/44C22C38/42C22C38/06C22C38/04C22C38/02B21J5/08
CPCB21J5/08C21D1/78C21D6/004C21D6/005C21D6/008C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50
Inventor 卞路杰罗克伟周鹏飞胡华军
Owner JIANGYIN HENGYE FORGING
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