A large-scale diesel engine gas valve and its manufacturing method
A manufacturing method and diesel engine technology, applied to mechanical equipment, combustion engines, internal combustion piston engines, etc., can solve problems such as structural fatigue, increased valve wear, grain coarsening, etc., to improve comprehensive mechanical properties and improve vibration damping performance , the effect of inhibiting grain growth
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Embodiment 1
[0043] The 3J40 alloy in this embodiment contains the following essential elements in terms of mass percentage: Cr: 39.2%, Al: 3.32%, Fe:: 0.12%, Ce: 0.2%, Si: 0.03%, Mn: 0.10%, S : 0.010%, P: 0.0033%, C: 0.018%, and the balance is Ni.
[0044] Manufacture diesel engine valves with a rod diameter of 67mm, a total length of 1230mm, and a disc diameter of 327mm. 3J40 alloy is given to make electric upsetting bar material, and the blanking length is 2560mm. Solution treatment is carried out before electric upsetting, and the 67mm bar is subjected to solution heat treatment at a temperature of 1020°C*60min oil cooling, and oil cooling. Static recrystallization occurs during the solid solution process, due to incomplete solid solution The lamellar phase and nickel-deficient Cr-Al-Ce granular phase retard the grain growth caused by the migration of static recrystallized grain boundaries, and at the same time provide heterogeneous nucleation due to the rare earth element Ce inclus...
Embodiment 2
[0056] The 3J40 alloy in Example 2 contains the following essential elements in mass percent: Cr: 39.56%, Al: 3.39%, Fe:: 0.14%, Ce: 0.12%, Si: 0.061%, Mn: 0.010%, S : 0.003%, P: 0.006%, C: 0.022%, and the balance is Ni.
[0057] The raw material of the alloy in Example 2 has undergone a series of operations in manufacturing and processing the valve (including two solid solution treatments and one aging heat treatment in the manufacturing steps of the patented valve). The pre-treatment solid solution treatment is 1000°C*50min oil cooling, the supplementary heat preservation treatment is 1000°C*20min+1020°C*25min, and the post-treatment aging heat treatment is 770°C*16h air cooling. The valve surface and rod material of the air-taking valve were subjected to scanning experiments and surface energy spectrum detection. The cut samples were electrolytically corroded with 10% oxalic acid solution for 5 seconds. to observe. The measured result: Figure 6 It is a 20,000 times scan...
Embodiment 3
[0059] The 3J40 alloy in Example 3 carries out the gas valve manufacturing process flow, including the following essential elements in mass percentage: Cr: 39.23%, Al: 3.35%, Fe:: 0.26%, Ce: 0.15%, Si: 0.061%, Mn: 0.010%, S: 0.002%, P: 0.005%, C: 0.015%, and the balance is Ni.
[0060] The solution treatment before electric heading is 1050℃*70min oil cooling. The unique rare earth element Ce of 3J40 alloy, after adding Ce element in the alloy, Ce element has the effect of refining the grain, and will generate fine spherical high melting point cerium oxide or cerium oxysulfide inclusions to replace some large low melting point inclusions segregated At the grain boundary, the Ce inclusions segregated at the grain boundary provide heterogeneous nucleation cores and increase the nucleation rate, so the austenite grains are refined and the grain boundaries increase. At the same time, the alloy The lamellar phase and the Ni-poor Cr-Al-Ce granular phase are not completely dissolved...
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