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对比研究了211Z铸造试样和热挤压变形试样经峰值时效热处理后的显微组织、晶间腐蚀前后的力学性能变化及晶间腐蚀程度。研究结果表明:铸造试样的晶间腐蚀等级为4级,而挤压试样的晶界腐蚀等级为3级,挤压热处理后在一定程度上改善了211Z合金的抗晶间腐蚀能力,并且经晶间腐蚀后其力学性能的下降程度明显小于铸造试样的。其原因在于:热挤压处理使得晶间沉淀相在晶界上更加弥散分布,降低了晶界无沉淀带的长度和宽度,破坏了晶间腐蚀的连续通道所致。
The microstructure of 211Z cast sample and hot extrusion deformation specimen after peak aging heat treatment were compared. The mechanical properties before and after intergranular corrosion and the degree of intergranular corrosion were investigated. The results show that the intergranular corrosion grade of the cast samples is four grades and the intergranular corrosion grade of the extruded samples is three grades. After the extrusion heat treatment, the intergranular corrosion resistance of the 211Z alloy is improved to a certain extent, and After the intergranular corrosion mechanical properties decreased significantly less than the cast sample. The reason is that: the hot extrusion process makes the intergranular precipitation phase more dispersed in the grain boundary distribution, reducing the grain boundary without the length and width of the precipitation zone, breaking the intergranular corrosion caused by the continuous channel.