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研究了CN617耐热合金铸锭退火后的高温热塑性,分析了该合金不同温度断裂方式及原因。研究结果表明,该合金在1000~1160℃具有较高的热塑性,断面收缩率在50%~70%之间,1100℃以下拉伸变形断裂方式为沿晶界断裂,1100~1150℃拉伸变形后断裂方式为韧性断裂;变形温度超过1200℃以后,断裂方式为沿晶界脆性断裂,热塑性显著降低,超过1250℃变形时,热塑性几乎为零,晶界偏聚的低熔点共晶相及易熔元素是造成塑性恶化的主要原因。
The high temperature thermoplasticity of CN617 heat-resistant alloy ingot after annealing was studied. The different temperature rupture modes and reasons were analyzed. The results show that the alloy has high thermoplasticity at 1000 ~ 1160 ℃ and the reduction of area is between 50% ~ 70%. The tensile deformation and fracture modes below 1100 ℃ are along the grain boundaries and tensile deformation occurs at 1100 ~ 1150 ℃ The post-fracture mode is ductile fracture. When the deformation temperature exceeds 1200 ° C, the fracture mode is brittle fracture along the grain boundary, and the thermoplasticity decreases significantly. When the deformation exceeds 1250 ° C, the thermoplasticity is almost zero and the low melting point eutectic phase Melting element is the main reason for plastic deterioration.