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Heat treatment method for maraging stainless steel

A heat treatment method and aging treatment technology, applied in the field of heat treatment of maraging stainless steel, can solve problems such as insufficient strength and toughness coordination

Inactive Publication Date: 2016-08-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the current development of maraging stainless steel is also facing a prominent problem, that is, the combination of strength and toughness is not excellent enough. How to study how to improve the toughness index while ensuring the high strength of maraging stainless steel has important theoretical significance and application value

Method used

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  • Heat treatment method for maraging stainless steel

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preparation example Construction

[0034] Sample preparation:

[0035] Select high-purity electrolytic Fe, electrolytic Ni, high-purity Mo, Co and other raw materials, and use an ultra-high vacuum induction furnace to melt a 25kg steel ingot. The composition of the sample steel is shown in Table 1. The steel ingot is forged at 1100°C±10°C, the final forging temperature is 900°C±10°C, and it is forged into a Φ40mm bar. The forging is annealed within 24 hours after forging, and annealed at 860°C±10°C for 2-3 hours. Furnace cold and ready to use.

[0036] Table 1 Example stainless steel chemical composition (mass percentage %)

[0037]

Embodiment 1

[0039] Take sample 1 stainless steel for solution treatment, solution heat treatment temperature is 1000 ° C, 1050 ° C, 1100 ° C, 1150 ° C for 60 minutes, water cooling; cryogenic treatment (mixed solution of liquid nitrogen + alcohol -78 ° C); and then in different Temperature (520°C, 540°C, 560°C, 580°C) aging heat treatment twice, each time for 2h, air cooling to room temperature. The specific process parameters are shown in Table 2. The heat treatment furnaces for solid solution and aging treatment are both 8KW muffle furnaces.

[0040] Solution treatment:

[0041] figure 1 Shown is the grain structure state of sample 1 after solid solution treatment + cryogenic treatment, which is represented by figure 1It can be seen that the grains after solid solution treatment at different temperatures are all equiaxed, and the grain sizes treated at different temperatures are measured, such as figure 2 As shown, with the increase of the solid solution temperature, the grain size ...

Embodiment 2-9

[0050] Samples 2-9 were taken to undergo solid solution + aging treatment under different conditions, and the process parameters are shown in Table 2.

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Abstract

The invention aims at providing a heat treatment method for maraging stainless steel. The heat treatment method is characterized by comprising the following steps of performing solution treatment on the maraging stainless steel at the temperature of 1100 to 1250DEG C for 40 to 90 minutes, and performing water cooling; then performing cryogenic treatment; and finally, performing ageing treatment for two times at the temperature of 500 to 580DEG C, insulating for 1 to 2 hours each time, and performing air cooling to room temperature. For an alloy treated by adopting the method, the tensile strength reaches 1900Mpa, the impact toughness reaches ak60J / cm<2>, the hardness is HRC50, and the strength and the toughness are well matched.

Description

technical field [0001] The invention relates to maraging stainless steel, and in particular provides a heat treatment method for maraging stainless steel. Background technique [0002] Because of its good strength, toughness and corrosion resistance, maraging stainless steel is widely used in load-bearing and corrosion-resistant (or high-temperature) components in high-tech fields such as aviation, aerospace, nuclear technology, ships, and advanced machinery manufacturing. This type of steel adopts the means of superposition of low-carbon martensitic transformation strengthening and aging strengthening effects to make the steel have super high strength and excellent comprehensive performance. Since the 1970s, maraging stainless steel has risen to a new level in terms of alloy composition design, smelting process and strength level. Especially in 1997, Martin et al. applied for the patent of maraging stainless steel Custom465, which changed the strength level from 1600MPa pu...

Claims

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Application Information

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IPC IPC(8): C21D1/78C21D6/04C22C38/52C22C38/44C22C38/04C22C38/48C22C38/02
CPCC21D1/78C21D6/004C21D6/005C21D6/007C21D6/008C21D6/04C21D2211/001C21D2211/008C22C38/004C22C38/02C22C38/04C22C38/44C22C38/48C22C38/52
Inventor 都祥元孔凡亚徐殿鑫李红军郭诚陈雅文
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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