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Steel for in-situ nano reinforced and toughened crankshaft

A nano-reinforced and toughened technology, applied in the field of in-situ nano-reinforced and toughened steel for crankshafts, can solve the problems of insufficient quality stability and achieve the effects of improving macro segregation, no decrease in toughness, and reducing formation and size

Active Publication Date: 2021-12-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with foreign advanced steel enterprises, there are still problems of insufficient quality stability, especially in the field of automobile crankshafts, which cannot be stably used as raw materials, and need to be improved again in terms of strength and toughness

Method used

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  • Steel for in-situ nano reinforced and toughened crankshaft
  • Steel for in-situ nano reinforced and toughened crankshaft
  • Steel for in-situ nano reinforced and toughened crankshaft

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Experimental program
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Effect test

Embodiment 1

[0031] Study on Strengthening of Crankshaft Steel 42CrMoA by Vanadium

[0032] The trace element vanadium has the highest solubility and is one of the most commonly used and effective strengthening elements for microalloyed steels. The role of vanadium is to affect the structure and properties of steel by forming V (C, N). It is mainly precipitated in the ferrite at the austenite grain boundary, thereby refining the ferrite grains and improving the strength of the steel. Theoretical research shows that adding 0.10% vanadium in steel can increase the strength by more than 200MPa. The strengthening effect caused by the large amount of trace element V precipitated in ferrite is obvious. Compared with other microalloying methods, the steel containing V has a lower yield ratio. For the strong plastic fit of steel, V-containing microalloyed steel has unique product performance advantages.

[0033] (1) Chemical composition of 42CrMoA steel for engine crankshaft

[0034] Vanadium ...

Embodiment 2

[0050] In-situ nano-reinforced and toughened engine crankshaft steel

[0051] In-situ nanoparticles induce grain refinement, and a large number of nanoparticles are distributed inside the fine grains to form nano-microstructure and improve toughness; in-situ nanoparticles absorb solute atoms, refine grains, and provide diffusion channels to eliminate segregation , to alleviate the deterioration of brittle segregation relative to plasticity and toughness; use in-situ nanoparticles, fine grains and dislocations to interact to produce strain hardening, dissipate energy, delay material instability, and improve toughness at the same time. Strengthening mechanism see Figure 4 .

[0052] Feeding nanowires through the LF refining process, see Figure 5 , Figure 6 , for precipitation strengthening.

[0053] The molten steel in the converter reaches the LF furnace for refining before the temperature is not lower than 1540°C. The refining time is controlled at 50 minutes per furnac...

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Abstract

The invention relates to steel for an in-situ nano reinforced and toughened crankshaft. The steel is characterized by comprising the following components in percentage by weight: 0.40 to 0.42 percent of carbon, 0.23 to 0.27 percent of silicon, 0.70 to 0.74 percent of manganese, 1.08 to 1.18 percent of chromium, 0.21 to 0.23 percent of molybdenum, 0.005 to 0.015 percent of titanium, 0.02 to 0.04 percent of vanadium, 0.010 to 0.040 percent of aluminum, 0.014 to 0.025 percent of sulfur and less than or equal to 0.015 percent of phosphorus. According to the steel, trace alloy elements vanadium and rare earth nanowires are added in the refining process, and a series of operations of refining steps are improved, so that a large number of in-situ nano-particles which are dispersively distributed are formed in the processes of steel melt, solidification and the like, the particle size is 2-30 nanometers, the distance between the nano-particles is 20-100 nanometers, 109-1012 nano-particles are contained in each crystal grain, a large number of in-situ nano-particles are dispersed and distributed, so that the generation of columnar crystals is inhibited, fine isometric crystals are formed, macrosegregation is improved, the formation and size of brittle phases are reduced, and the strength and plasticity of the crankshaft steel are improved; the in-situ nanoparticles and the matrix are in a coherent or semi-coherent relationship, dislocation is not easy to accumulate, stress concentration is reduced, so that the toughness is not reduced, and the contradictory problem of strengthening and toughening is solved.

Description

technical field [0001] The invention belongs to the field of steel preparation for crankshafts, in particular to an in-situ nano-reinforced and toughened steel for crankshafts. Background technique [0002] The crankshaft is the most important part of the engine, with complex geometry and very harsh working conditions. When working, it produces periodically changing bending and torsional stress, which bears the force transmitted from the connecting rod, converts it into torque and outputs it through the crankshaft and drives other accessories on the engine to work. During the actual operation of the engine, the crankshaft is subjected to constantly changing gas pressure, inertial force and moment, and bears the combined load of bending and torsion. Alternating stresses such as bending, torsion, shearing, tension and compression are generated in each part, resulting in higher temperature and wear. Due to the importance of the crankshaft and the complexity of its working con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/28B22D11/16B22D11/22C21C7/00C21C7/06C21C7/064C21C7/10C22C33/06
CPCC22C38/02C22C38/04C22C38/22C22C38/28C22C38/24C22C38/06C22C33/06C21C7/0006C21C7/0068C21C7/10C21C7/0056B22D11/16B22D11/225C21C7/064C21C7/0025C21C7/06Y02P10/20
Inventor 王艳林张灵通陈晓华王自东张博炜郑志浩
Owner UNIV OF SCI & TECH BEIJING
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