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利用OM、SEM、XRD和TEM等方法对6%Si铸态高硅奥氏体不锈钢在不同固溶处理温度下的bcc相的演变规律进行了研究,分析了不同固溶处理温度下组织中bcc相的回溶与重新析出过程中元素变化、形貌和结构特征,并制定合理的热处理制度。结果表明,6%Si高硅不锈钢铸态组织中的析出相主要为bcc相,该相沿晶界和枝晶间分布,并富含Mo、Si、Ni等元素,晶格常数a=0.8747 nm。样品在1050~1200℃、2 h固溶处理时,bcc析出相中的Mo、Cr元素含量随温度的升高而增加;当温度达到1200℃时bcc相发生回溶,在1250℃、2 h固溶处理时bcc相重新析出。
The evolution of bcc phase in 6% Si as-cast austenitic austenitic stainless steel at different solution treatment temperatures was investigated by OM, SEM, XRD and TEM. The effects of bcc Phase dissolution and re-precipitation elements in the process of change, morphology and structural features, and to develop a reasonable heat treatment system. The results show that the precipitated phase in the as-cast 6% Si high silicon stainless steel is mainly bcc phase, which is distributed along the grain boundaries and dendrites and is rich in elements such as Mo, Si and Ni. The lattice constant is a = 0.8747 nm. The contents of Mo and Cr in the precipitated phase of bcc increase with the increase of temperature at 1050 ~ 1200 ℃ for 2 h. When the temperature reaches 1200 ℃, the bcc phase remelted, Bcc phase re-precipitation solution treatment.