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利用Gleeble-3800热模拟试验机研究了一种新型超高强度不锈钢在变形温度850~1150℃,应变速率0.01~10 s~(-1)条件下的热压缩变形行为,建立了钢的热变形方程及动态再结晶晶粒的尺寸模型。结果表明,变形过程中,变形温度降低和应变速率增加都会使钢的高温流变应力增加。应变速率相同时,随变形温度升高,动态再结晶程度逐渐增加;而当变形温度相同时,随应变速率降低,动态再结晶晶粒发生长大。试验钢的变形激活能为452.024 k J/mol,热变形方程为:ε=6.933 09×10~(16)[sinh(0.004 67σ)]~(7.215 4)exp(-452 024/RT),动态再结晶临界应变εc与形变温度和应变速率的关系为:ε_c=8.89×10~(-3)(εexp(54 369/T))~(0.073 28)粒尺寸模型为D_(DRX)=947.28×Z~(-0.123)。
The hot compressive deformation behavior of a new type of ultra-high strength stainless steel under the conditions of deformation temperature of 850 ~ 1150 ℃ and strain rate of 0.01 ~ 10 s ~ (-1) was studied by using Gleeble-3800 thermal simulation tester. The thermal deformation Equation and Size Model of Dynamic Recrystallization Grain. The results show that during the deformation process, the deformation temperature decreases and the strain rate increases, the high temperature flow stress of steel increases. With the same strain rate, the dynamic recrystallization gradually increases with the increase of deformation temperature. When the deformation temperature is the same, the dynamic recrystallization grains grow up with decreasing strain rate. The deformation activation energy of the test steel is 452.024 kJ / mol and the thermal deformation equation is: ε = 6.933 09 × 10 ~ 16 [sinh 0.004 67σ]] ~ (7.215 4) exp (-452 024 / RT) The relationship between the recrystallization critical strain εc and the deformation temperature and strain rate is: ε_c = 8.89 × 10 -3 (εexp (54 369 / T)) ~ (0.073 28) The grain size model is D DRX = 947.28 × Z ~ (-0.123).