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通过不同热加工参数下的热压缩试验,研究了新型阀门钢5Cr9Si3的高温变形行为.5Cr9Si3钢在850~900℃和1000~1100℃温度区间内峰值应力分别随温度的升高而减小,而在900~1000℃温度区间内出现峰值应力随温度升高而增大的异常现象.进一步的微观组织及相结构演化分析表明:5Cr9Si3钢在900~1000℃温度区间内发生了由铁素体向奥氏体的转变,产生奥氏体相变强化;同时,随着变形温度的提高,碳化物的回溶造成碳元素和铬元素对5Cr9Si3基体固溶强化效果增强.相变强化和固溶强化是导致5Cr9Si3在900~1000℃温度区间内流变应力异常变化的主要原因.
The thermal deformation behavior of the new valve steel 5Cr9Si3 was studied by thermal compression test under different hot working parameters. The peak stress of 5Cr9Si3 steel decreases with increasing temperature at 850-900 ℃ and 1000-1100 ℃, respectively. In the temperature range of 900 ~ 1000 ℃, the anomaly of peak stress increases with the increase of temperature.The further microstructure and phase structure evolution analysis show that the microstructure and phase structure evolution of 5Cr9Si3 steel occur in the temperature range of 900 ~ 1000 ℃ from ferrite to At the same time, as the deformation temperature increases, the effect of carbon and chromium on the solid solution strengthening of 5Cr9Si3 matrix increases with the increase of deformation temperature. Phase transformation strengthening and solution strengthening It is the main reason that the flow stress of 5Cr9Si3 changes abnormally in the temperature range of 900 ~ 1000 ℃.