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A_1堆焊材料是一种铁基高温耐磨合金。用于热拔伸模时,具有很高的使用寿命。经常温、高温机械性能试验、光学金相、透射电镜的研究,证明该材料是由奥化体、δ铁素体、少量孪晶马氏体为基和弥散的合金碳化物、金属间相所组成。作为热作模具材料,它除了具有一般热作模具材料应有的高温硬度、高温强度和耐热疲劳性能外,还具有在热形变应力作用下“自身强化”的特点。但该材料亦容易在服役条件下受冷热循环及交变应力的作用使表层形成龟裂。同时由于挤压磨擦拉沟、粘结磨损、磨粒磨损、粘附氧化物等因素,降低表面光洁度,导致几经修磨超差而失效。
A_1 surfacing material is a kind of iron-based high-temperature wear-resistant alloy. For hot drawing die, has a high life. The results of mechanical tests, optical metallography and transmission electron microscopy at room temperature and high temperature show that the material is composed of anodized body, δ-ferrite, a small amount of twinned martensite and dispersed alloy carbides. The intermetallic phase composition. As a hot die material, in addition to its general hot die material should have the high temperature hardness, high temperature strength and thermal fatigue resistance, but also has a thermal deformation stress under the “self-reinforcing” features. However, the material is also susceptible to cracks in the surface due to thermal cycling and alternating stresses under service conditions. At the same time due to squeeze friction ditches, bond wear, abrasive wear, adhering oxides and other factors, reducing the surface finish, resulting in several grinding grinding over tolerance and failure.