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采用Gleeble-3500热模拟试验机进行单道次等温热压缩试验,分析研究了Cu-P-Cr-Ni-Mo耐候钢在不同温度、不同应变量和不同应变速率下的组织演变和铁素体晶粒细化机制。结果表明,Cu-P-Cr-Ni-Mo耐候钢在875℃变形时铁素体的析出机制为形变诱导相变(DIFT)。随应变量增加,铁素体转变量先缓慢增加后急剧增加再缓慢增加的S形曲线特征;铁素体晶粒尺寸随应变量增加而减小,当应变为1.6时,铁素体平均晶粒尺寸最小,大约为3μm。在0.01~30 s-1的应变速率下,随应变速率增加,铁素体转变量增加,铁素体晶粒尺寸减小,当应变速率为30 s-1时,铁素体平均晶粒尺寸最小,约为1.9μm。Cu-P-Cr-Ni-Mo耐候钢在875℃变形时,铁素体晶粒细化机制为形变诱导铁素体相变和铁素体的动态再结晶。
The single-pass isothermal compression test was carried out on a Gleeble-3500 thermal simulator to analyze the microstructure evolution and the microstructure evolution of the Cu-P-Cr-Ni-Mo weathering steels at different temperatures, different strain rates and different strain rates, Body grain refinement mechanism. The results show that the precipitation mechanism of the ferrite in the Cu-P-Cr-Ni-Mo weathering steel at 875 ℃ is the deformation-induced phase transformation (DIFT). With the increase of strain, the amount of ferrite transformation increases slowly and then increases slowly and then increases slowly. The ferrite grain size decreases with the increase of strain amount. When the strain is 1.6, the average ferrite grain size The smallest particle size, about 3μm. At the strain rate of 0.01-30 s-1, with the increase of strain rate, the amount of ferrite transformation increases and the grain size of ferrite decreases. When the strain rate is 30 s-1, the average ferrite grain size The smallest, about 1.9μm. When the Cu-P-Cr-Ni-Mo weathering steel is deformed at 875 ℃, the grain refinement mechanism of ferrite grain is deformation-induced ferrite transformation and dynamic recrystallization of ferrite.