Uniaxial creep test data for 14 MoV 6 3 material at 550 °C and a stress of 165 MPa (fourth repeat test)

This data collection consists of uniaxial creep, uniaxial tensile, and elastic modulus results from tests performed on low-alloy steels at FZ Jülich in the scope of COST 501/II/WP5 C. With COST 501 Round II Work Package 5 concerned with the prediction of residual lifetime under simulated service loads, the WP5 C sub-package was focused on steam pipe steels.In the scope of the WP5 C sub-package, creep rupture testing of 13CrMo 4 4 (1Cr0.5Mo0.25V) and 14MoV 6 3 (0.5Cr0.5Mo0.25V) steels in new (normalised and tempered) and service exposed conditions was carried out. The service conditions were 250 000 h at 525°C for 13CrMo 4 4 and 116 000 h at 530°C for 14MoV 4 4. The aims were to provide basic creep rupture data for the steels and to provide a series of test pieces with defined amounts of creep strain for non-destructive analysis of creep damage.For the short duration tests, the new materials were significantly stronger than the service exposed materials. With increasing test time the rupture strengths of the new and the service exposed material converged as stable microstructures were established.For the 13CrMoV 4 4 steel, the creep damage developed depended on the initial condition; new material exhibited creep pore formation after relatively low creep strains around 1 % whereas in the service exposed condition no cavitation after 10 000 h was observed. For the 14MoV 6 3 steel, creep damage was found in short duration tests of both new and service exposed material.

本数据集包含于利希研究中心（FZ Jülich）在COST 501/II/WP5 C框架下开展的低合金钢(low-alloy steels)试验所得的单轴蠕变(uniaxial creep)、单轴拉伸(uniaxial tensile)及弹性模量(elastic modulus)测试结果。COST 501第二期工作包5(Work Package 5)聚焦模拟服役载荷(simulated service loads)下的剩余寿命(residual lifetime)预测，而其子包WP5 C则以蒸汽管道用钢(steam pipe steels)为研究对象。在WP5 C子包的研究范围内，研究人员对13CrMo 4 4（1Cr0.5Mo0.25V）及14MoV 6 3（0.5Cr0.5Mo0.25V）两种钢材的全新（正火回火态（normalised and tempered））和服役后状态试样开展了蠕变断裂试验(creep rupture testing)。针对13CrMo 4 4钢的服役条件为525℃下服役250000小时，14MoV 4 4钢的服役条件则为530℃下服役116000小时。本研究的目标为获取两种钢材的基础蠕变断裂数据，并制备一系列蠕变应变(creep strain)可控的试样，用于蠕变损伤(creep damage)的无损分析(non-destructive analysis)。短时试验中，全新试样的强度显著高于服役后试样；随着试验时长增加，二者的断裂强度逐渐趋同，最终形成稳定的微观组织。针对13CrMoV 4 4钢，其蠕变损伤演化规律取决于初始状态：全新试样在蠕变应变约1%的较低水平下即出现蠕变孔洞形成(creep pore formation)，而服役后试样在10000小时试验后未观察到空穴(cavitation)现象。而对于14MoV 6 3钢，全新及服役后试样的短时试验中均发现了蠕变损伤。