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利用Gleeble-3800研究了Cr-Ni-Mo-N型双相不锈钢在700-1200℃内的高温塑性,并结合J-Mat Pro计算,金相及断口观察分析了引发试验钢高温塑性变化的机理。结果表明,试验钢的最佳热加工温度为940~1130℃,并存有两个低塑性区。其中,在较低温度700~900℃低塑性区,热塑性在800℃时达到最低,有害相σ、χ的出现导致了该塑性低凹区形成;在较高温度1150~1200℃低塑性区,带尖角的奥氏体硬质相是导致该高温区内塑性降低的重要原因。
The high temperature plasticity of Cr-Ni-Mo-N duplex stainless steel at 700-1200 ℃ was studied by Gleeble-3800. The mechanism of high temperature plasticity induced by the high temperature of the test steel was analyzed by metallographic and fracture analysis combined with J-Mat Pro calculation . The results show that the optimum hot working temperature of the test steel is 940 ~ 1130 ℃, and there are two low plasticity zones. In the low plasticity region of 700-900 ℃, the thermoplasticity reaches the lowest at 800 ℃, and the occurrence of the harmful phase σ and χ leads to the formation of this low plasticity region. In the low plasticity region of 1150-1200 ℃, A sharp austenitic hard phase is a major cause of plasticity reduction in this high temperature zone.