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发布网友发布时间：2022-04-30 01:25

共3个回答

热心网友时间：2022-06-27 23:51

The automobile exhaust manifold flanges are connect with engine, it is highest temperature in the exhaust system,with engine performance improvement, and the parts of the engine exhaust system should be improve the working temperature. At the same time, the exhaust manifold suffered from the high temperature of hot air circulation, and it driving in tough weather, the material has required engine exhaust manifold with more heat resistance, oxidation,

Exhaust manifold should have good of high-temperature mechanical properties and performance. With the improvement of automobile engine power and exhaust temperature rises,the exhaust manifold heat load is increasing, thus required engine exhaust manifold must have high temperature resistant, high temperature oxidation resistance, and have good thermal fatigue long etc. The automobile engine exhaust manifold is each cylinder engine exhaust together to the important parts of the vehicle platoon, the work efficiency of exhaust system depends on the exhaust manifold in the design and manufacture of the importance of the manifold.

High silicon-molybdenum ctile iron is currently the most major automotive exhaust manifold, it better than other materials,such as good superiority of high strength and thermal fatigue degree, excellent resistance to oxidation, ShengChangXing and good resistance to creep, and high silicon-molybdenum by moderate price,it can be for mass proction. This experiment research through by high silicon-molybdenum performed for the test of thermal fatigue,which analysis for some of its properties.

Thermal fatigue test choice by many sample, except for select multiple primitive as-cast sample,it can do two type of testing,the thermal fatigue test upper room temperature is same,and maximum temperature 850 ° c and 900° c respectively. It because of high silicon molybdenum ctile iron temperature of automotive exhaust manifold is 850 ° c, so the sample of 850° c is important sample. and heating 10 minutes for the sample, and remove quenching heat,and heated again. Record times, and the size of the sample, and the first crack of the times and crack changes.

It adopt for D/Max 2500 X-ray diffractometer, 5310 and JXA - JSW - 84 scanning electron microscope, LinK - OLYMPUS - PMG3 ISIS spectrum and metallographic microscope respectively for high silicon-molybdenum ctile iron microstructure observation. Using scanning electron microscope.the shape and thermal fatigue crack initiation and propagation characteristics of cracks formation and propagation, the analysis of crack mechanism.

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热心网友时间：2022-06-27 23:51

Car exhaust manifold flange and the engine is connected through, is the highest temperature of the exhaust system components, and with the increased engine performance, engine exhaust system temperature rise. Meanwhile, the exhaust manifold hot air discharge withstand the heat cycle impact, and adverse weather driving conditions, the engine exhaust manifold of the materials required more heat resistance, oxidation, exhaust manifold should be good in high temperature mechanical properties and performance. With the continuous improvement of vehicle engine power and exhaust temperature, exhaust manifold's heat load increase, and requested the engine exhaust manifold need to have a high temperature oxidation resistance, high temperature resistant growth, good thermal fatigue and so on. Engine exhaust manifold is the engine exhaust air from each cylinder to bring together the important parts of the vehicle emissions, the level of exhaust system efficiency depends on the design and manufacture exhaust manifold exhaust manifold can be seen importance. High silicon molybdenum ctile iron main material for the current vehicle exhaust manifold, has many advantages over other materials, such as good high temperature strength, thermal fatigue resistance, excellent resistance to oxidation, growth and good high temperature creep resistance, and affordable high-silicon molybdenum, can be mass proced. Therefore, this experimental study was made of high silicon molybdenum ball thermal fatigue test, study and analyze some of its properties. Thermal fatigue testing to select multiple samples, in addition to the original cast samples, the two sets of experiments to do, lower the temperature the same thermal fatigue test are at room temperature, maximum temperature was 900 ℃ and 850 ℃. Which e to the high Si-Mo ctile iron exhaust manifolds for automotive operating temperature is 850 ℃, 850 ℃ for the sample experiment therefore focused on. Sample heated for 10 minutes, remove the quenching, reheating. Record number, and the sample size changes, and crack the first time changes in the number and crack. By D / max 2500 X-ray diffraction, JSW-5310 and JXA-840 scanning electron microscope, LinK-ISIS spectroscopy and OLYMPUS-PMG3 optical microscope were high silicon molybdenum ctile iron microstructure observation. The scanning electron microscopic morphology of thermal fatigue cracks and crack initiation and propagation characteristics of crack formation and propagation mechanism.

热心网友时间：2022-06-27 23:52

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