ADI ductile iron with mechanical properties can be adjusted in a wide range, with a good cast, high

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ADI ductile iron with mechanical properties can be adjusted in a wide range, with a good cast, high strength combined with high ductility, is the ideal material for making today crankshaft in automobile engine load large. The above properties may be due to thermal tečajna lista method specially created organizations aus-ferrite: austenite organization tečajna lista combines stability with ferrite needle (vitmanstet) or a mixture of ferrite needle and small polygonal ferrite fine. This article refers to the relationship between the two organizations with the format of it satisfy the condition of detailed work such as automotive engine crankshaft.
Austempering Ductile Iron (ADI) has đó mechanical properties can change in a wide range. This material combining good castability recently highstrength and plasticity is an exellent material for automobile crankshaft of high loading. There are properties of ADI Due to special heat treatting tečajna lista avaiable for Aus-ferrite microstructure: a com-bination stable austenite and the between the between needle Feritte or mix of stable austenite and fine needle Feritte and polygonal Feritte (Widmanstandten) or betwen mixture of austenite and feritte . In this paper the relationship the between these two types of microstructure, mechanical properties and its related, according to working conditons of automobile crankshaft will be discussed.
ADI ductile iron is much research and applications in a number of industrialized countries like the U.S., Germany, Japan cars made in the detailed high fatigue resistance, have complex shapes such as the crankshaft, as suspension, wheels gas engine that plays [4] [5] ... The calculation of the ADI is determined primarily by base metals. The background of ductile cast iron is usually a mixture of perlite tečajna lista and ferrite, after getting held thermal martensite ram increase abrasion resistance but poor toughness, deformation and large, tečajna lista not suitable for the detailed shape complex, working in conditions to endure. To improve the mechanical properties, traditional cast iron heat demand to receive bainit organization, this organization is a mixture of ferrite needles with carbide tečajna lista Velvety have high viscosity, small deformation, but still did not meet the mechanical properties the details of working in abrasive conditions, bumps and big load.
The advent of ductile iron ADI, with heat treatment regime has created tečajna lista special organizations tečajna lista mixture of austenite to ferrite stable form or sheet metal has excellent mechanical properties generated for this type of cast iron. For this organization, ductile iron ADI must be more alloying elements increase tečajna lista the stability of the international organization desired behavior. Normally this type of iron is more alloying Ni ((2%), Cu ((0.4%), in which special attention is Ni. Elemental That increases the stability of the austenitic, ferritic tečajna lista durable goods , do-curve "C" must be translated into, to reduce the critical cooling rate and lower the martensitic transformation point. Such characteristics make the ADI cast iron heat treatment can keep isotherms in a long time in on the martensite tečajna lista transformation temperature, austenite partially transformed into ferrite and austenite remaining sections are stable. Council is the element increases the likelihood of graphite, increased fluidity, reduced shrinkage when molded, and also increased elastic tečajna lista modulus, reduce brittleness of carbide, cutting and increased durability, although the iron content of the ADI is not large. Adjustable heat mode to get organized aus-ferritic microstructure with rate certain of two phases, with different shapes of ferrite is the goal to get the special mechanical properties of ADI. This article refers to the heat treatment regime to create the shape of various international organizations with the various properties of ductile iron ADI.
The studies tečajna lista were performed on ductile iron castings are tested after chemical composition as shown in Table 1 (1) [7]. Reliability must be reached 800MPa, on 2% ductility, hardness from (190-230) HB, to achieve the level of demand on 80% diameter tečajna lista bridge (25-60) μ m, organizations tečajna lista must make subtle sure ratio of ferrite / perlite appropriate, carbide and xementit not exist. Sample international research organizations and hardness of size 20x20x30mm; tensile test samples, each built according tečajna lista to American tečajna lista ASTM standards. Then I sample the isothermal ADI in two different modes (modes 1 and 2). Study the dependence of the microscopic organization of ductile iron ADI in thermal regime (temperature and isothermal holding time) to allow assessment of the effectiveness isothermal mode for the mechanical properties of ADI.
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