Fe-18Cr-9Mn-1.1Ni-1.1Mo-0.2N节Ni型双相不锈钢高温热变形行为
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摘要
采用Gleeble-3800热力模拟实验机在温度为1 123～1 423 K,应变速率为0.01～10 s~(-1)的条件下对Fe-18Cr-9Mn-1.1Ni-1.1Mo-0.2N节Ni型双相不锈钢进行热压缩实验,以研究其高温热压缩变形机理和组织演变规律,确定了应力水平常数α值,依照双曲正弦方程,建立了Z参数的峰值流变应力本构方程,并且绘制了不同应变量下的热加工图。研究表明:在发生动态再结晶的低应变速率0.01～0.1 s~(-1)的高温1 323～1 423 K区域,峰值应力所对应的应变值越小,奥氏体的动态再结晶越容易发生。相同应变速率下,奥氏体相随变形温度升高由动态回复向动态再结晶组织转变。铁素体动态再结晶主要发生在1 123～1 223 K中低温区。基于热变形方程计算得到该双相不锈钢的表观形变激活能(Q=578.46 kJ/mol)高于2205双相不锈钢(451 kJ/mol),其表观应力指数n=8.439 8,表明它的变形机制主要是以晶格自扩散控制的稳定结构模型为主。热加工图分析表明,随着应变量的增加,在较高应变速率区域失稳区增大。确定的最佳热加工区域的条件:应变速率为0.01～0.08 s~(-1),温度为1 323～1 423 K,该区域功率耗散系数都较大,为0.30～0.52,该条件下试验钢热变形以奥氏体动态再结晶为主。
Using Gleeble-3800 thermal simulation machine, the hot compression experiment was conducted to investigate the deformation mechanism and microstructure evolution of Fe-18 Cr-9 Mn-1.1 Ni-1.1 Mo-0.2 N duplex stainless steel(DSS) in the temperature of 1 123—1 423 K, and the strain rate of 0.01—10 s~(-1). According to the hyperbolic sine equation, the peak flow stress constitutive equation of the Z parameter was established after determining the value of stress level constant α, meanwhile, the thermal processing drawings under different strain have been drawn. In the dynamic recrystallization(DRX) region of low deformation strain rate 0.01—0.1 s~(-1)and high deformation temperature 1 323—1 423 K, the smaller value of strain corresponding to the peak stress, the easier occurring of austenite DRX. At the same strain rate, the auste-nite phases change from dynamic recovery to DRX with the increase of deformation temperature. The ferrite DRX mainly occurred in the middle deformation temperature region of 1 123—1 223 K. The deformation apparent activation energy Q was calculated as 578.46 kJ/mol based on thermal deformation equation, which is higher than that of 2205 DSS(451 kJ/mol), and the apparent stress exponent n was calculated as 8.439 8, indicated that the deformation mechanism is structure stability model based on lattice self-diffusion controlled. The analysis of hot processing maps shows that the instable regions gradually increase with the increase of strain on the condition of high strain rates. The optimized thermal processing area was determined to be in the strain rate of 0.01—0.08 s~(-1), in the deformation temperature of 1 323—1 423 K, and the corresponding high values of power dissipation coefficients are between 0.30—0.52, thus, the austenite DRX occurred under this deformation conditions for tested steels.
Using Gleeble-3800 thermal simulation machine, the hot compression experiment was conducted to investigate the deformation mechanism and microstructure evolution of Fe-18 Cr-9 Mn-1.1 Ni-1.1 Mo-0.2 N duplex stainless steel(DSS) in the temperature of 1 123—1 423 K, and the strain rate of 0.01—10 s~(-1). According to the hyperbolic sine equation, the peak flow stress constitutive equation of the Z parameter was established after determining the value of stress level constant α, meanwhile, the thermal processing drawings under different strain have been drawn. In the dynamic recrystallization(DRX) region of low deformation strain rate 0.01—0.1 s~(-1)and high deformation temperature 1 323—1 423 K, the smaller value of strain corresponding to the peak stress, the easier occurring of austenite DRX. At the same strain rate, the auste-nite phases change from dynamic recovery to DRX with the increase of deformation temperature. The ferrite DRX mainly occurred in the middle deformation temperature region of 1 123—1 223 K. The deformation apparent activation energy Q was calculated as 578.46 kJ/mol based on thermal deformation equation, which is higher than that of 2205 DSS(451 kJ/mol), and the apparent stress exponent n was calculated as 8.439 8, indicated that the deformation mechanism is structure stability model based on lattice self-diffusion controlled. The analysis of hot processing maps shows that the instable regions gradually increase with the increase of strain on the condition of high strain rates. The optimized thermal processing area was determined to be in the strain rate of 0.01—0.08 s~(-1), in the deformation temperature of 1 323—1 423 K, and the corresponding high values of power dissipation coefficients are between 0.30—0.52, thus, the austenite DRX occurred under this deformation conditions for tested steels.
引文
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15 Gironès A,Llanes L,Anglada M,et al.Materials Science & Engineering A,2004,367(1-2),322.
16 Prasad Y V R K,Gegel H L,Doraivelu S M,et al.Metallurgical Tran-sactions A,1984,15,1883.
17 Huang F X,Yin P,Li S S,et al.Journal of Chongqing Institute of Technology(Natural Science),2010,24(1),92(in Chinese).黄福祥,尹平,李司山,等.重庆理工大学学报(自然科学),2010,24(1),92.
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