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采用Gleeble 3500热模拟试验机研究了轧制和卷取温度下磷元素晶界偏聚与热轧板高温热塑性的关联机制。研究结果表明,含磷钢中磷元素晶界偏聚符合空位-磷原子复合体非平衡共偏聚理论,800℃以上轧制温度对磷元素晶界偏聚引起的钢板脆性影响较小,而在500~650℃温度范围存在磷元素偏聚导致的热塑性低谷区,且在该温度区施加1%拉伸预应变将加剧磷元素晶界偏聚和钢板脆性。因此,本试验成分含磷钢热轧生产中卷取温度设定应避免550℃塑性低谷。
The Gleeble 3500 thermal simulator was used to study the mechanism of the segregation of phosphorus at the grain boundaries and the high temperature thermoplastic of hot rolled sheets at rolling and coiling temperatures. The results show that the segregation of phosphorus element boundaries in phosphorus-containing steel accords with the theory of unbalanced segregation of vacancies-phosphorus atom complex. The temperature above 800 ℃ has little effect on the brittleness of steel plate due to the segregation of phosphorus element boundaries. In the temperature range of 500 ~ 650 ℃ there is a thermoplastic trough zone caused by the segregation of phosphorus, and the application of 1% tensile prestrain in this temperature zone aggravates the segregation of phosphorus element boundaries and the brittleness of the steel plate. Therefore, the test composition of hot-rolled phosphorus steel production coiling temperature should be set to avoid plastic ductile 550 ℃.