Tungsten and molybdenum composite strengthened high-cobalt nickel and high-toughness secondary hardened ultrahigh-strength steel
An ultra-high-strength steel and secondary hardening technology, applied in the field of alloy steel, can solve problems such as deterioration of fracture toughness, engineering application addition, poor tempering stability, etc., and achieve the effect of excellent comprehensive performance and high tempering stability
Active Publication Date: 2013-12-18
CENT IRON & STEEL RES INST
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Problems solved by technology
[0008] Although the secondary hardening type ultra-high strength steel has a good combination of strength and toughness, the current strengthening method is relatively simple, and there is still a gap between its maximum strength and the actual demand. added a lot of suffering
At present, the development of secondary hardening steel mainly relies on a single Mo 2 C alloy carbide is strengthened to ensure that the material has high toughness, and its strength is difficult to exceed 2000MPa.
Because its strength depends heavily on the content of C, Mo and Co in the alloy, the C content in the steel is increased from 0.11 to 0.23% from HY180 to AerMet100, but according to the research, under the condition of single Mo strengthening, the recovery of the steel Poor fire stability, sensitive to overaging, and at the same time, under the condition of low Mo content, C content exceeding 0.25% can lead to deterioration of fracture toughness
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[0033] According to the chemical composition scope of steel of the present invention, adopt 25 kilograms of vacuum induction furnaces to prepare 10 furnaces of alloy ingots of 21 kilograms, its concrete chemical composition is shown in Table 3, and furnace number is 1# ~10 # .
[0034] After 10 furnaces of steel were smelted and cast into steel ingots, the high-temperature homogenization treatment system was first carried out before forging: after 6 hours of heat preservation at 1200 ° C, the temperature was lowered for forging, and the forging heating temperature was 1150 ° C. The dimensions of forged test rods are: φ15×2000mm, 15×15×2000mm and 25×45×L.
[0035] After forging, the test bar is firstly subjected to normalizing and annealing heat treatment: normalizing treatment at 1050°C×1h, air cooling, annealing treatment at 680°C×6h, and air cooling. Then send the sample section to process the tensile, impact and fracture toughness sample blanks. The final heat treatment i...
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Abstract
The invention relates to tungsten and molybdenum composite strengthened high-cobalt nickel and high-toughness secondary hardened ultrahigh-strength steel, and belongs to the technical field of alloy steel. The tungsten and molybdenum composite strengthened high-cobalt nickel and high-toughness secondary hardened ultrahigh-strength steel is characterized by comprising the following chemical components in percentage by weight: 0.20-0.40% of C, 0.5-3.0% of Cr, 8.00-15.0% of Ni, 8.00-15.00% of Co, 1.00-5.00% of Mo, 1.0-3.0% of W, 0.05-0.20% of V, not more than 0.10% of Ti and the balance of Fe and inevitable impurities. Compared with the prior art, the tungsten and molybdenum composite strengthened high-cobalt nickel and high-toughness secondary hardened ultrahigh-strength steel has the advantages of good comprehensive performance, higher tensile strength and good plastic toughness and can be used for improving the tempering stability of the material.
Description
technical field [0001] The invention belongs to the technical field of alloy steel, in particular to a tungsten (W) and molybdenum (Mo) compound strengthened high toughness secondary hardened ultra-high strength steel. Background technique [0002] Prior to this, high-toughness secondary hardening ultra-high-strength steel has always been the focus of research and application. After nearly half a century of development, its application has become more and more extensive, and the representative ones are HY180, AF1410, AerMet100, etc. , and its chemical composition is shown in Table 1. [0003] Table 1 Chemical composition of typical secondary hardening ultra-high strength steel (wt.%) [0004] steel type C co Ni Mo Cr Fe HY180 0.11 8.0 10.0 1.0 2.0 the remaining AF1410 0.16 14.0 10.0 1.0 2.0 the remaining AerMet100 0.23 13.4 11.1 1.2 3.1 the remaini...
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IPC IPC(8): C22C38/52
Inventor 王春旭厉勇刘宪民韩顺黄顺喆邢峰田志凌
Owner CENT IRON & STEEL RES INST