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利用Gleeble-1500D热模拟机对不同温度下的Monel-400合金及熔敷金属进行拉伸试验。结果表明,母材和熔敷金属在高温下的强度不断下降,母材的塑性随温度的升高而增大,熔敷金属的塑性急剧下降。在高温下,细小弥散的第二相粒子对熔敷金属起到了明显的强化作用,而熔敷金属的塑性发生了严重劣化。母材从低温到高温(700~1100℃)的断裂形式是韧性断裂,熔敷金属断裂形式由韧性断裂逐步变为脆性断裂。在实际热加工和应用过程中,避免熔敷金属发生大变形,防止产生加工热裂纹,避免母材在700℃以上使用,可以适当提高熔敷金属的使用范围。
Tensile tests were performed on the Monel-400 alloy and the deposited metal at different temperatures using a Gleeble-1500D thermal simulator. The results show that the strength of base metal and deposited metal decreases at high temperature, the plasticity of base metal increases with the increase of temperature and the plasticity of deposited metal decreases sharply. At high temperatures, the finely dispersed second-phase particles play a significant strengthening effect on the deposited metal while the ductility of the deposited metal is severely degraded. The fracture mode of the base metal from low temperature to high temperature (700 ~ 1100 ℃) is ductile fracture. The form of the deposited metal fracture gradually changes from ductile fracture to brittle fracture. In the actual thermal processing and application process, to avoid large deformation of the deposited metal to prevent the occurrence of processing hot cracks, to avoid the use of base metal above 700 ℃, you can properly increase the use of deposited metal range.