Multiphase reinforced ultrahigh-strength maraging stainless steel and preparation method thereof

A technology of stainless steel and martensite, which is applied in the field of multiphase strengthening ultra-high strength maraging stainless steel and its preparation, can solve the problems of complex preparation process and low corrosion resistance mechanical properties, and achieve simple preparation method and corrosion resistance Good, excellent mechanical properties

Inactive Publication Date: 2021-11-26
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Purpose of the invention: In view of the problems of complex preparation process, low corrosion resistance and low mechanical properties of the existing ultra-high-strength stainless ste...

Method used

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  • Multiphase reinforced ultrahigh-strength maraging stainless steel and preparation method thereof
  • Multiphase reinforced ultrahigh-strength maraging stainless steel and preparation method thereof
  • Multiphase reinforced ultrahigh-strength maraging stainless steel and preparation method thereof

Examples

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Embodiment 1

[0050] Select pure iron, metal chromium, metal nickel, metal manganese, metal molybdenum, metal cobalt, metal titanium, and iron-silicon raw materials. The composition of stainless steel is as follows (mass percentage): Co=3.0, Cr=11.0, Mn=0.08, Mo =5.0, Ni=8.0, Si=0.4, Ti=2.0, Fe balance.

[0051] Vacuum melting is used throughout the process to prepare ingots.

[0052] High-temperature homogenization treatment, heating in air, the heating method is heating with the furnace, the heating rate is 100°C / h, holding at 700°C for 4 hours, then raising the temperature to 1100°C for 20 hours, and cooling to room temperature with the furnace.

[0053] The process conditions for hot rolling blanking are: the cast billet is heated to 1100°C, held for 10 hours and then rolled out of the furnace; the hot rolling start temperature is 1100±20°C, the final rolling temperature is ≥950°C, the total amount of sheet hot rolling is 50%, ice The water mixture is cooled.

[0054] The sheet was co...

Embodiment 2

[0058] Select pure iron, metal chromium, metal nickel, metal manganese, metal molybdenum, metal cobalt, metal titanium, and iron-silicon raw materials. The stainless steel composition is as follows (mass percentage): Co=1.0, Cr=12.0, Mn=0.5, Mo =6.0, Ni=9.0, Si=0.5, Ti=1.5, Fe balance.

[0059] Vacuum melting is used throughout the process to prepare ingots.

[0060] High-temperature homogenization treatment, heating in air, the heating method is heating with the furnace, the heating rate is 100°C / h, holding at 700°C for 4 hours, then raising the temperature to 1150°C for 20 hours, and cooling to room temperature with the furnace.

[0061] The process conditions for hot rolling blanking are: the cast billet is heated to 1200°C, held for 30 hours and then rolled out of the furnace; the hot rolling start temperature is 1150±20°C, the final rolling temperature is ≥950°C, the total amount of sheet hot rolling is 50%, ice The water mixture is cooled.

[0062] The sheet was cold r...

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Abstract

The invention discloses multiphase reinforced ultrahigh-strength maraging stainless steel and a preparation method thereof. The multiphase reinforced ultrahigh-strength maraging stainless steel is prepared from the following components in percentage by mass: 1.0 to 5.0 percent of Co, 6.0 to 10.0 percent of Ni, 11.0 to 17.0 percent of Cr, 0.3 to 2.0 percent of Ti, 3.0 to 7.0 percent of Mo, 0.08 to 1.0 percent of Mn, 0.08 to 0.5 percent of Si, less than or equal to 0.02 percent of C, less than or equal to 0.003 percent of P, less than or equal to 0.003 percent of S and the balance of Fe. The preparation method comprises the following steps: (1) proportioning alloy elements; (2) carrying out vacuum smelting on an electrode in a vacuum induction smelting furnace; (3) carrying out vacuum consumable remelting; (4) carrying out high-temperature fire homogenizing treatment; (5) carrying out forging or hot rolling cogging; (6) carrying out cold rolling deformation; and (7) carrying out heat treatment. According to the multiphase reinforced ultrahigh-strength maraging stainless steel and the preparation method, a precipitation phase and inverted austenite are uniformly and finely distributed, and the partition efficiency of the inverted austenite forming elements is higher.

Description

technical field [0001] The invention relates to a multi-phase strengthened ultra-high-strength maraging stainless steel and a preparation method thereof, belonging to the field of martensitic stainless steel. Background technique [0002] Martensitic precipitation strengthened stainless steel is a new steel bell developed in the 1960s. It not only has the strength of maraging strengthened steel but also has the corrosion resistance of stainless steel. Due to its excellent comprehensive mechanical properties, it is often used in key high-end equipment such as aviation, aerospace, and navigation. [0003] The main reason why martensitic precipitation-strengthened stainless steel can achieve ultra-high strength is the superposition of martensitic transformation strengthening and aging precipitation strengthening; the main reason for its corrosion resistance is that the addition of Cr and Mo forms a passivation film on the surface, making it corrosion resistant. Table 1 shows...

Claims

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Application Information

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IPC IPC(8): C22C38/52C22C38/50C22C38/44C22C38/04C22C38/02C22C33/06C21D1/74C21D8/00C21D8/06C21D8/10C21D1/18C21D6/04
CPCC22C38/52C22C38/50C22C38/44C22C38/04C22C38/02C22C33/06C21C5/005C21D1/74C21D8/005C21D8/065C21D8/105C21D1/18C21D6/04C21D6/004C21D6/005C21D6/007C21D6/008C21D2211/008Y02P10/25C21D9/46C21D8/0226C22C38/002C21D8/0205C21D1/28C21D8/0236
Inventor 张中武李俊澎
Owner HARBIN ENG UNIV
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