材料期刊网

采用热模拟试验机在温度900~1200℃,应变速率0.1~10 s-1的条件下对UNS S32750双相不锈钢进行了热压缩试验,研究了其热加工变形行为,并建立了热变形方程.结果表明:在1200℃不同应变速率下压缩变形时,此双相不锈钢发生了动态回复,且应变速率越低其动态回复现象越明显;在900℃不同应变速率下压缩变形时,则发生了动态再结晶,且应变速率越高其动态再结晶现象越明显;该双相不锈钢热压缩变形受热激活过程控制,热变形激活能为503 kJ·mol-1,热变形方程为ε·=8.3×1018[sinh(0.0086σp)]4.2exp(-503000/RT).

The hot compression experiments of the duplex stainless steel UNS S32750 were carried out at the temperatures from 900 ℃ to 1200 ℃ and the strain rates from 0.1 s-1 to 10 s-1 by the thermal simulator.The hot deformation behavior of the duplex stainless steel was studied and the hot deformation equation was established.The results show that during compression at 1200 ℃ and different strain rates,the dynamic recovery occurred in the duplex stainless steel and the dynamic recovery phenomenon was relatively obvious at a relatively low strain rate. During compression at 900 ℃ and different strain rates,the dynamic recrystallization occurred and the dynamic recrystallization phenomenon was relatively obvious at a relative high strain rate.The compression deformation of the duplex stainless steel was controlled by the thermally activated process.The thermally activated energy of the duplex stainless steel was 503 kJ · mol-1 and the hot deformation equation was listed asε· = 8.3 × 1018[sinh(0.0086σp)]4.2exp(-503000/RT).