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Hot Deformation Behavior and Flow Stress Prediction of Ultra Purified 17% Cr Ferritic Stainless Steel Stabilized with Nb and Ti 被引量:4
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作者 Fei GAO Fu-xiao YU +1 位作者 Hai-tao LIU Zhen-yu LIU 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第9期827-836,共10页
The hot deformation behavior of ultra purified 17% Cr ferritic stainless steel stabilized with Nb and Ti was investigated using axisymmetric hot compression tests on a thermomechanical simulator.The deformation was ca... The hot deformation behavior of ultra purified 17% Cr ferritic stainless steel stabilized with Nb and Ti was investigated using axisymmetric hot compression tests on a thermomechanical simulator.The deformation was carried out at the temperatures ranging from 700 to 1 100℃ and strain rates from 1to 10s-1.The microstructure was investigated using electron backscattering diffraction.The effects of temperature and strain rate on deformation behavior were represented by Zener-Hollomon parameter in an exponent type equation.The effect of strain was incorporated in the constitutive equation by establishing polynomial relationship between the material constants and strain.A sixth order polynomial was suitable to represent the effect of strain.The modified constitutive equation considering the effect of strain was developed and could predict the flow stress throughout the deformation conditions except at800℃in 1s-1 and at 700℃in 5and 10s-1.Losing the reliability of the modified constitutive equation was possibly ascribed to the increase in average Taylor factor at 800℃in 1s-1 and the increase in temperature at 700℃in 5and10s-1 during hot deformation.The optimum window for improving product quality of the ferritic stainless steels was identified as hot rolling at a low finisher entry temperature of 700℃,which can be achieved in practical production. 展开更多
关键词 17%Cr ferritic stainless steel hot deformation flow stress constitutive equation strain compensation
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Influence of the finish rolling temperatures on the microstructure and texture evolution in the ferritic stainless steels 被引量:1
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作者 Fei GAO Zhenyu LIU Haitao LIU Guodong WANG 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2011年第5期343-350,共8页
The influence of the finish rolling temperature on the microstructure and texture evolution of Nb and B micro-alloyed ultra purified Cr17 ferritic stainless steels was investigated. The hot rolled bands were produced ... The influence of the finish rolling temperature on the microstructure and texture evolution of Nb and B micro-alloyed ultra purified Cr17 ferritic stainless steels was investigated. The hot rolled bands were produced by conventional rolling process and the finish rolling at relatively low temperatures or "warm rolling". The microstructure was observed by optical microscopy, scanning electron microscopy and transmission electron microscopy, and X-ray diffraction was used to characterize the texture evolution processes. The results showed that as compared to conventional hot rolling process, the warm rolling has led to the refined and homogeneous microstructure and uniform recrystallization texture along γ-fiber in final sheets, indicating that the finish rolling at relatively low temperatures can be the effective way to improve significantly the formability of final sheets. 展开更多
关键词 Ultra purified Cr17 ferritic stainless steel Finish rolling temperature MICROSTRUCTURE TEXTURE
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高纯Cr17钢板厚方向织构演变、成形性能及表面皱折 被引量:4
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作者 高飞 刘海涛 +1 位作者 刘振宇 王国栋 《材料热处理学报》 EI CAS CSCD 北大核心 2012年第4期38-43,共6页
以高纯Cr17铁素体不锈钢为实验材料,对比研究了热轧不退火、退火两种工艺对其板厚方向织构演变、成形性及表面皱折的影响。采用金相显微镜、X射线衍射技术及背散射电子衍射技术观察两种工艺条件下的组织和织构演变。结果表明:成品板各... 以高纯Cr17铁素体不锈钢为实验材料,对比研究了热轧不退火、退火两种工艺对其板厚方向织构演变、成形性及表面皱折的影响。采用金相显微镜、X射线衍射技术及背散射电子衍射技术观察两种工艺条件下的组织和织构演变。结果表明:成品板各层织构特征存在显著差异,这是由于低温轧制过程中沿板厚方向不同应变状态导致的热轧织构梯度遗传所致。与热轧不退火相比,热轧退火有利于成品板各层γ纤维再结晶织构增强,偏离{111}<112>组分的程度减弱,α纤维织构弱化;有利于弱化成品板的带状晶粒簇,促使晶粒簇分布均匀分散。 展开更多
关键词 高纯Cr17铁素体不锈钢 织构 成形性 表面皱折
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高纯Cr17铁素体不锈钢的热变形行为 被引量:4
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作者 高飞 刘振宇 王国栋 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2011年第10期1406-1409,共4页
采用MMS200热/力模拟机及Thermo-Calc热力学计算方法,研究了高纯Cr17铁素体不锈钢在变形温度为600~1 100℃、应变速率为1~10 s-1条件下的热变形规律.结果表明,在热变形过程中,高纯Cr17铁素体不锈钢的组织均以铁素体为主,不存在γ/α... 采用MMS200热/力模拟机及Thermo-Calc热力学计算方法,研究了高纯Cr17铁素体不锈钢在变形温度为600~1 100℃、应变速率为1~10 s-1条件下的热变形规律.结果表明,在热变形过程中,高纯Cr17铁素体不锈钢的组织均以铁素体为主,不存在γ/α相变且仅仅发生较快的动态回复软化;高纯Cr17铁素体不锈钢热的变形激活能为384.985 kJ/mol.在此基础上,确定了Z参数,并得到了高纯Cr17铁素体不锈钢的峰值应力σp与Z参数间的关系. 展开更多
关键词 Cr17铁素体不锈钢 热变形 THERMO-CALC 动态回复
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N含量对17-4PH马氏体时效不锈钢铁素体相和性能的影响 被引量:5
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作者 史咏鑫 马胜斌 +3 位作者 才丽娟 李青 张欣杰 冯文静 《特殊钢》 北大核心 2019年第1期68-71,共4页
试验用17-4PH不锈钢(/%:0.02~0.03C,0.40~0.54Si,0.41~0.60Mn,0.018~0.026P,0.001S,15. 56~15. 75Cr,4. 31~4. 50Ni,3. 21~3.40Cu,0. 20~0. 25Nb,0. 013~0. 067N)采用20 t EAF+LF+VOD+ESR的工艺冶炼,锻造成Φ150 mm棒材。试验... 试验用17-4PH不锈钢(/%:0.02~0.03C,0.40~0.54Si,0.41~0.60Mn,0.018~0.026P,0.001S,15. 56~15. 75Cr,4. 31~4. 50Ni,3. 21~3.40Cu,0. 20~0. 25Nb,0. 013~0. 067N)采用20 t EAF+LF+VOD+ESR的工艺冶炼,锻造成Φ150 mm棒材。试验结果表明:钢中N含量由0.013%增加至0.067%时,钢中铁素体含量由0.5%增至6%,钢的强度、硬度升高,塑性降低。当N含量控制在0.020%~0.045%,钢中铁素体含量为1%~3%,经1040℃1 h水冷+480 2 h空冷后,钢的力学性能合格;固溶态钢的HB硬度值≤325,优化了该材料的加工性能。 展开更多
关键词 17-4PH马氏体时效不锈钢 N含量 时效性能 固溶硬度 铁素体
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17%Cr铁素体不锈钢中的第二相与织构 被引量:7
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作者 高飞 刘振宇 +3 位作者 张维娜 刘海涛 孙广庭 王国栋 《金属学报》 SCIE EI CAS CSCD 北大核心 2012年第10期1166-1174,共9页
通过工艺控制得到了不同尺寸及分布特征的析出相,研究了其对再结晶织构的影响.结果表明:降低精轧温度有利于尺寸更加细小、分布更加弥散的析出相TiC的形成,经冷轧及退火后这种析出相分布特征可遗传至冷轧退火板;粗大、稀疏析出相的样品... 通过工艺控制得到了不同尺寸及分布特征的析出相,研究了其对再结晶织构的影响.结果表明:降低精轧温度有利于尺寸更加细小、分布更加弥散的析出相TiC的形成,经冷轧及退火后这种析出相分布特征可遗传至冷轧退火板;粗大、稀疏析出相的样品具有较强的γ纤维再结晶织构;细小、弥散的析出相有助于随机取向再结晶晶核的形成,抑制再结晶晶粒的长大,从而弱化了γ纤维再结晶织构及恶化了冷轧退火板成形性能;析出相对随机取向晶粒形核的作用及晶界迁移的钉扎作用是控制铁素体不锈钢再结晶织构的重要因素之一. 展开更多
关键词 17%Cr铁素体不锈钢 析出相 织构 再结晶
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