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为研究砷及铜砷共存对钢热塑性的影响,利用Gleeble-1500热模拟试验机研究了700~1100℃温度范围内含0.16%As和含0.17%Cu+0.075%As的C-Mn钢的高温塑性行为。结果表明:钢中的Cu、As引起C-Mn钢第Ⅲ脆性区向较高温度区间迁移,然而对高温抗拉强度影响不大。奥氏体+铁素体两相区薄膜状先共析铁素体沿奥氏体晶界析出导致沿晶断裂,但700℃时,由于As促进铁素体的生成,含0.16%As的C-Mn钢为韧性断裂,塑性恢复。奥氏体单相区低温域Cu、As的晶界偏聚导致含Cu、As的C-Mn钢沿晶断裂。
In order to study the influence of coexistence of arsenic and copper and arsenic on the thermal plasticity of steel, the high temperature of C-Mn steel with 0.16% As and 0.17% Cu + 0.075% As in the temperature range of 700 ~ 1100 ℃ was studied by Gleeble-1500 thermal simulation tester Plastic behavior. The results show that Cu and As in steel cause the third brittle zone of C-Mn steels to migrate to the higher temperature range, but have little effect on high temperature tensile strength. Austenite + ferrite two-phase thin film pro-eutectoid ferrite along the austenite grain boundary precipitation led to intergranular fracture, but at 700 ℃, due to As to promote the formation of ferrite, 0.16% As containing C -Mn steel ductile fracture, plastic recovery. The grain boundary segregation of Cu and As in the low temperature austenite single phase region leads to the intergranular fracture of the C-Mn steel containing Cu and As.