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为了研究残余元素Cu、As和Sn对钢高温延塑性的影响,采用Gleeble-1500热模拟试验机测试了含有一定量Cu、As和Sn低合金钢连铸坯的高温延塑性,得到了低合金钢第Ⅲ脆性温度区在920～730℃之间.结果表明:第Ⅲ脆性温度区脆化的主要原因是奥氏体单相区低温域钢中Cu、As和Sn等残余元素在奥氏体晶界的偏聚削弱晶界结合能,导致试样沿晶脆性断裂;奥氏体和铁素体两相区在原奥氏体晶界析出的网状铁素体导致试样沿晶开裂.钢中的Cu、As和Sn元素增加第Ⅲ脆性温度区的宽度和脆性凹槽的深度,同时提高第Ⅲ脆性温度区的上限临界温度.
In order to study the effect of residual elements Cu, As and Sn on the ductility of high temperature steel, Gleeble-1500 thermal simulation test machine was used to test the high-temperature ductility of low-alloy steels containing Cu, As and Sn. The third brittle temperature zone of steel Ⅲ was between 920 and 730 ℃ .The results showed that the main reason of embrittlement in the third brittle temperature zone was that the residual elements such as Cu, As and Sn in the austenite single-phase zone of low temperature steel were in austenite The segregation of the grain boundaries weakens the binding energy of the grain boundaries, resulting in brittle fracture along the grains. The reticular ferrite precipitated in the austenite grain boundaries at the austenite and ferrite two-phase regions causes cracking along the grains Cu, As and Sn elements increase the width of the third brittle temperature zone and the depth of the brittle groove, while increasing the upper critical temperature of the third brittle temperature zone.