对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr...对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管显著优于1 050 ℃正火和790 ℃回火原工艺生产的厚壁无缝钢管,强塑性指标及其标准偏差已达到进口P91厚壁无缝钢管的水平,表明我国9Cr 1Mo V Nb N厚壁无缝钢管的制造技术已日趋成熟。展开更多
对9Cr 1Mo V Nb N钢厚壁无缝管研制品与进口住友P91钢管在供货状态下进行了比较研究,测试了两者的静力拉伸强塑性,分析了其间存在的差异.结果表明,研制品的强塑性与进口管相差尚少,但钢中杂质元素的控制与住友钢管有一定差距,质量均... 对9Cr 1Mo V Nb N钢厚壁无缝管研制品与进口住友P91钢管在供货状态下进行了比较研究,测试了两者的静力拉伸强塑性,分析了其间存在的差异.结果表明,研制品的强塑性与进口管相差尚少,但钢中杂质元素的控制与住友钢管有一定差距,质量均匀性有待提高.展开更多
The cyclic oxidation behavior of Fe-9Cr-1Mo steel (9Cr-1Mo) in 10%H2O+90%Ar (volume fraction) atmosphere at 600, 650 and 700 ℃ for various time was studied. The oxidation mechanism of 9Cr-1Mo steel in 10%H2O+90%Ar at...The cyclic oxidation behavior of Fe-9Cr-1Mo steel (9Cr-1Mo) in 10%H2O+90%Ar (volume fraction) atmosphere at 600, 650 and 700 ℃ for various time was studied. The oxidation mechanism of 9Cr-1Mo steel in 10%H2O+90%Ar atmosphere was discussed. The thermal stress was evaluated in two oxide layers to illustrate the spallation of the oxide layer. The experimental results indicate that there exists a duplex oxide scale with an outer layer of Fe2O3 and an inner layer of mixed (Fe, Cr)3O4 formed on 9Cr-1Mo steel during cyclic oxidation. Some cracks generated in both inner and outer oxide layers. Parts of oxide scales spalled from substrate during the cyclic oxidation. A higher tensile stress in the oxide layer is formed at the early oxidation stage than at the later oxidation stage during heating. This tensile stress results in the formation of cracks in the oxide layer.展开更多
High-temperature creep rupture behavior of modified 9Cr-lMo steel used for steam cooler was investigated at temperature of 838 and 923 K and stress ranging from 100 to 250 MPa.Based on the analysis of creep rate-time ...High-temperature creep rupture behavior of modified 9Cr-lMo steel used for steam cooler was investigated at temperature of 838 and 923 K and stress ranging from 100 to 250 MPa.Based on the analysis of creep rate-time curves,it is found that the creep rupture life decreases with the increase in the applied stress and temperature.The creep damage tolerance factor has been identified as a value of 8.In the normalized and tempered condition,the studied steel shows typical martensitic microstructure with Cr-rich M23C6 and Nb-or V-rich MX precipitates.Moreover,the Laves phase has been found along the grain boundaries.The fracture morphology characterized by field emission scanning electron microscope is adopted to reveal the creep failure mechanisms.The investigated results indicate the occurrence of the transgranular fracture under all the creep test conditions.展开更多
采用一种新型在线无损检测的试验方法———微型杯突试验法研究电站锅炉管道用 9Cr 1Mo V Nb N钢的强度和塑性。结果表明 :该试验方法与常规的单轴拉伸试验之间有很好的可比性 ,并且通过微型杯突试验的结果估算 9Cr 1Mo V Nb N钢的屈服...采用一种新型在线无损检测的试验方法———微型杯突试验法研究电站锅炉管道用 9Cr 1Mo V Nb N钢的强度和塑性。结果表明 :该试验方法与常规的单轴拉伸试验之间有很好的可比性 ,并且通过微型杯突试验的结果估算 9Cr 1Mo V Nb N钢的屈服强度与抗拉强度及伸长率 ,给出相应的经验公式。同时在采用微型杯突试验法估算 9Cr 1Mo V Nb N钢的塑性时 ,首次提出断裂挠度率的概念。展开更多
文摘对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管显著优于1 050 ℃正火和790 ℃回火原工艺生产的厚壁无缝钢管,强塑性指标及其标准偏差已达到进口P91厚壁无缝钢管的水平,表明我国9Cr 1Mo V Nb N厚壁无缝钢管的制造技术已日趋成熟。
基金Project(2006-8) supported by the Huadian International Corporation Limited
文摘The cyclic oxidation behavior of Fe-9Cr-1Mo steel (9Cr-1Mo) in 10%H2O+90%Ar (volume fraction) atmosphere at 600, 650 and 700 ℃ for various time was studied. The oxidation mechanism of 9Cr-1Mo steel in 10%H2O+90%Ar atmosphere was discussed. The thermal stress was evaluated in two oxide layers to illustrate the spallation of the oxide layer. The experimental results indicate that there exists a duplex oxide scale with an outer layer of Fe2O3 and an inner layer of mixed (Fe, Cr)3O4 formed on 9Cr-1Mo steel during cyclic oxidation. Some cracks generated in both inner and outer oxide layers. Parts of oxide scales spalled from substrate during the cyclic oxidation. A higher tensile stress in the oxide layer is formed at the early oxidation stage than at the later oxidation stage during heating. This tensile stress results in the formation of cracks in the oxide layer.
基金National Natural Science Foundation of China (Grant No.51705316)Shanghai Municipal Bureau of Quality and Technical Supervision (No.2016-40).
文摘High-temperature creep rupture behavior of modified 9Cr-lMo steel used for steam cooler was investigated at temperature of 838 and 923 K and stress ranging from 100 to 250 MPa.Based on the analysis of creep rate-time curves,it is found that the creep rupture life decreases with the increase in the applied stress and temperature.The creep damage tolerance factor has been identified as a value of 8.In the normalized and tempered condition,the studied steel shows typical martensitic microstructure with Cr-rich M23C6 and Nb-or V-rich MX precipitates.Moreover,the Laves phase has been found along the grain boundaries.The fracture morphology characterized by field emission scanning electron microscope is adopted to reveal the creep failure mechanisms.The investigated results indicate the occurrence of the transgranular fracture under all the creep test conditions.
文摘采用一种新型在线无损检测的试验方法———微型杯突试验法研究电站锅炉管道用 9Cr 1Mo V Nb N钢的强度和塑性。结果表明 :该试验方法与常规的单轴拉伸试验之间有很好的可比性 ,并且通过微型杯突试验的结果估算 9Cr 1Mo V Nb N钢的屈服强度与抗拉强度及伸长率 ,给出相应的经验公式。同时在采用微型杯突试验法估算 9Cr 1Mo V Nb N钢的塑性时 ,首次提出断裂挠度率的概念。
