High temperature properties of continuous casting high carbon steels
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摘要: 采用Gleeble-1500熱模擬試驗機測量了高碳鋼連鑄板坯的高溫力學性能,得到了第Ⅰ、第Ⅲ脆性溫度區的溫度范圍.結果表明:第Ⅰ脆性溫度區脆化的主要原因是晶界部位的低熔點物質在高溫下首先熔化,從而導致試樣沿晶界開裂;第Ⅲ脆性溫度區脆化的主要原因是在奧氏體部位析出的網狀鐵素體導致試樣沿晶界開裂;在奧氏體單相區,由于氮化鋁的析出導致鋼種的塑性惡化.Abstract: High temperature properties of continuous casting high carbon steels were measured by tensile tests with a Gleeble 1500 system and two embrittlement temperature regions of region Ⅰ and region Ⅲ were found. The results indicated that the cause of embrittlement in region I was the existence of liquid film along dendritic interfaces, and the embrittlement in region Ⅲ was caused by precipitation of proeutectoid ferrite film along austenite grain boundary. AIN precipitation at the full austenite grain boundary would worsen the ductility of the steels.
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