测试了3X-52钢连铸坯试洋的高温延性。变形试样中主要有三类碳、氮化物析出:高温下析出的块状粗大 TiN 析出物;950～900℃沿晶界和在晶粒基体内部析出的微细动态析出产物;依附在 TiN 颗粒上生成的复合析出物。与不含钛的含铌钢相比,X-5...测试了3X-52钢连铸坯试洋的高温延性。变形试样中主要有三类碳、氮化物析出:高温下析出的块状粗大 TiN 析出物;950～900℃沿晶界和在晶粒基体内部析出的微细动态析出产物;依附在 TiN 颗粒上生成的复合析出物。与不含钛的含铌钢相比,X-52钢试样在850℃～Ar_3温度之间没有出现进一步的延性降低,γ→P转变温度的提高,减轻了其在第Ⅲ脆性温度区的脆性程度。展开更多
Hot ductility of the Nb- and Ti-containing line-pipe steel CC slab specimens were measured under the sirain rate of 1 x 10-3/s. Three types of precipitates were found in the fractured specimens. One was the block-shap...Hot ductility of the Nb- and Ti-containing line-pipe steel CC slab specimens were measured under the sirain rate of 1 x 10-3/s. Three types of precipitates were found in the fractured specimens. One was the block-shaped coarse TiN particles precipitated at high temperature. Another type was the fine dynamic precipitation products precipitated at 950～900℃ which caused remarkable ductility reduction of the steel. The third type was the co-existed precipitates formed by fine Nb precipitates nucleating and growing on TiN paricles. Compared with Nb-containing steel which contains no Ti, there was no ductility drop for Nb- and Ti-containing steel at temperature between 850℃ and Ar3 and, the γ→α transformation inside the grain matrixes proceeded faster, which both improved the ductility of the steel in the low ductility temperature Region Ⅲ.展开更多
文摘测试了3X-52钢连铸坯试洋的高温延性。变形试样中主要有三类碳、氮化物析出:高温下析出的块状粗大 TiN 析出物;950～900℃沿晶界和在晶粒基体内部析出的微细动态析出产物;依附在 TiN 颗粒上生成的复合析出物。与不含钛的含铌钢相比,X-52钢试样在850℃～Ar_3温度之间没有出现进一步的延性降低,γ→P转变温度的提高,减轻了其在第Ⅲ脆性温度区的脆性程度。
文摘Hot ductility of the Nb- and Ti-containing line-pipe steel CC slab specimens were measured under the sirain rate of 1 x 10-3/s. Three types of precipitates were found in the fractured specimens. One was the block-shaped coarse TiN particles precipitated at high temperature. Another type was the fine dynamic precipitation products precipitated at 950～900℃ which caused remarkable ductility reduction of the steel. The third type was the co-existed precipitates formed by fine Nb precipitates nucleating and growing on TiN paricles. Compared with Nb-containing steel which contains no Ti, there was no ductility drop for Nb- and Ti-containing steel at temperature between 850℃ and Ar3 and, the γ→α transformation inside the grain matrixes proceeded faster, which both improved the ductility of the steel in the low ductility temperature Region Ⅲ.
