Relationship between Mechanical and Magnetic Properties of the Austempered Ductile Irons

Ductile铁的强度和半导体的良好组合是由Austempering完成的。最近，Austempered Ductile Iron基于磁性特征学的质量保证技术。在成熟的半导体铁中，机械、磁性和微观结构被确定为0.6%的c钢含有基质的化学成分，而成熟的半导体铁的拉伸强度为60- 80%的成熟钢含有基质的化学成分。However，对Austempered Ductile iron的影响价值和延伸是一个很大的低比钢价值。在延长和影响值上的SpheroidGraphite的炎症是很有启发性的。在330-390 ° C的条件下，在0.5-10小时内发现了高影响值。在这些Austemperation的条件下， Saturation Magnetization较低，因此，非磁Austenite的大数量仍然保留着。由于提高对奥氏体钢和钢的影响价值和延伸的目的，奥氏体需要保留20 - 45%在体积部分中。硅含量和老化对老化半导体钢和钢的影响价值和老化的影响。在Austempered Ductile铁和钢中，张力强度是实现协同作用的直接途径。同样，在艰苦和合作之间的关系是线性的。饱和磁化的测量可以用于确定保留的奥氏体铁和钢的体积部分的测定。“张力强度和强度可能足够接近，以衡量Austempered Ductile Irons和钢的协同性。”

The good combination of strength and ductility of ductile iron is achieved by austempering. Recently, quality assurance technique of austempered ductile iron has been based on the magnetic characteristics. Relationship between mechanical, magnetic properties and microstructure were determined in austempered ductile iron and 0.6%c steel containing chemical composition of matrix of ductile iron.The tensile strength of austempered duceile iron was 60-80% of austempered steel having chemical composition of matrix. However, impact value and elongation of austempered ductile iron were much lowerthan values of steel. The infulence of spheroidal graphite on elongation and impact value is very pronounced. High impact values were obtained in the conditions of austempering at 330-390゜C for 0.5-10 hours. In these austempering conditions, saturation magnetization was lower, so that large quantities of non-magnetic austenite were retained. For the purpose of improving of impact value and elongation of austempered ductile irons and steel, austenite needed to retain from 20 to 45% in volume fraction. Silicon content and austenitizing temperature influence impact value and elongation of austempered ductile irons and steel. In the austempered ductile iron and steel, tensile strength is in direct proportion to coercivity. Similarly, relationship between hardness and coercivity is linear. The measurements of saturation magnetization could be used for determining volume fraction of retained austenite of ductile iron and steel. The tensile strength and hardness could be estimated closely enough by measuring coercivity of austempered ductile irons and steel.