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Ce in Fe-6A1-3.5C-1.3Si Heat Cast Iron


(4) addition of 0.1% Ce can Fe-6A1-3.5C-1.3Si alloy at room temperature strength increased 2.5 times increase of 3 times the value of impact toughness, hardness, ductility improved significantly. (5) Fe-6A1-3.5C-1.3Si alloy changed after addition of Ce isothermal oxidation kinetic curves of the alloy type, reducing the oxidation rate of the alloy to improve the oxidation resistance of the alloy. Reference】 【l can be as old, Liu Hong. The progress of the domestic heat 【J1_ cast iron. 1998,3:49-52. 【2】 Li Chao, Lin Qin Ye, et al. Rare Earth Elements in Fe-Cr-Al Alloys reported 【J1-China Rare Earth,[link widoczny dla zalogowanych], 1983, l (1) :47-56. 【3] Pre ~ ottR, GrahamMJ. Theoxidationofiron-aluminumal-loys [J]. Oxidationofmetals. 1992,38 (1 / 2): 73 ~ 87. 【4] PrescottR, GrahamMJ. TheFormationofAluminumOxideScalesonHigh-TemperatureAlloys [J]. Oxidationofmetals, 1992,38 (3 / 4) :233-254. 【51 LI Shuan,[link widoczny dla zalogowanych], Zhang Yaming. Active element of the alloy high temperature oxidation mechanism of 【J1. Corrosion Science and Protection Technology, 2001,13 (6): 333 ~ 335. [6l Li Hui in the City of heat-resistant cast aluminum in the organization and properties of [O1. Central South University, a master's degree thesis, 2000. 【7】 Shen Liqun. Of modification in the application of metallic materials 【J1. Foundry Technology, 1994, (6) :28-30. 【8】 Zhang Hua, SUN YANG, Shen Chun. Ce in Fe Alloys a 28A1】 【J. Chinese Rare Earth Society, 1998,16 (4) :361-365. Combination of metallic and sand casting process to make high-strength cast iron casting of this method is not affected to the conditions in the environment, improve casting strength and dimensional accuracy, the water-cooled metal mold and the hard sand from the combination of Volvo called Starting from the impact on the environment, efforts to reduce diesel engine emissions to strike and lower fuel costs, in terms of design increases the maximum combustion pressure and light weight, cast iron casting technology to improve the strength and dimensional accuracy is a priority: the high strength of gray cast iron is to accelerate the cooling rate to achieve the following effects: (1) quench to make crystal grains fine solidification; (2) increasing the carbon content of austenite, pearlite, carbide and more; (3) The rapid total Analysis of changes in pearlite layer thinning: In addition, the solidification of cast iron cooling,[link widoczny dla zalogowanych], phase change process due to graphite precipitation caused by volume expansion and contraction, pressure changes associated with the melt, causing up boxes, casting size change, to control its impact to a minimum. Volvo's SKOVDE casting plant development and at the same time T to address these two issues is the hard white sand fixed on the water-cooled metallic container, called the Combined type of metal sand, in addition, in order to control the melt pressure changes exert pressure on the new mold fastening process (FPC). This approach has the following effect. (1) improve the tensile strength and dimensional accuracy; (2) may reduce the CE value; (3) The cast has some tightening up the pressure and reduce the tendency of cases to reduce the micro porous and sticky sand; (4 ) The use of self-hardening sand,[link widoczny dla zalogowanych], lightweight design freedom can increase and improve production efficiency; (5) reduced casting cleaning costs; (6) the amount of casting sand can save 70%, the casting can reduce the odor around the plant ; (7) cooling solidification process, the mold cooling water, 50% of the heat obtained can be reused. SKOVDET plant in Sweden 50% of gray iron castings, the main products are cylinder head,[link widoczny dla zalogowanych], cylinder, brake wheel, wheel and flywheel, with its total output reached 84,000 tons / year, production is the wave of the mainstream model. Autumn 2001, Volvo Car 9L, 12L engine with cast iron cylinder head FPC production process, is now an annual output of 6,000 tons. This set of FPC production equipment investment ll1O million. And because of the FPC process development and access to international Foundry Society Environmental Award in 2002. Volvo and the FPC3 12
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