论文部分内容阅读
为了研究双相不锈钢热加工过程中稀土对有害析出相的影响,采用扫描电镜(SEM)、X射线能谱仪(EDS)、金相显微镜、X射线衍射(XRD)及冲击性能等测试方法研究了混合稀土La、Ce元素对2205双相不锈钢组织和冲击性能的影响。结果表明,稀土元素细化了22Cr型双相不锈钢的显微组织,并且富集在相界及其周围,减小了铁素体/奥氏体界面处Cr、Mo元素的富集程度,延缓了σ相的析出;混合稀土通过细化晶粒、变质夹杂物和延缓σ相的析出提高了22Cr型双相不锈钢的冲击韧性,20℃时提高约40%,促使其断裂机制从解理断裂向韧窝断裂转变。
In order to study the influence of rare earth on the harmful precipitation phase in the hot working process of duplex stainless steel, SEM, EDS, metallographic microscope, X-ray diffraction (XRD) and impact properties test methods Effect of Mixed Rare Earth Elements La and Ce on Microstructure and Impact Properties of 2205 Duplex Stainless Steel. The results show that the rare earth elements refine the microstructure of 22Cr duplex stainless steel and enrich the phase boundary and its surroundings, reducing the enrichment of Cr and Mo elements at the ferrite / austenite interface and delaying And the precipitation of sigma phase. Mixed rare earth improves the impact toughness of 22Cr duplex stainless steel by refining grains, metamorphic inclusions and delaying the precipitation of sigma phase, increasing about 40% at 20 ℃, promoting the fracture mechanism from cleavage fracture Change to dimple fracture.