Room-temperature Creep Tests under Constant Load on a TRIP-aided Multi-microstructure Steel
Room-temperature Creep Tests under Constant Load on a TRIP-aided Multi-microstructure Steel
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TRIP 辅助多微结构钢恒定载荷下的室温蠕变试验
DOI：
10.1016/j.msea.2017.06.049
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
N.Nagahisa and S. Harjo
中科院分区：
文献类型：
--
作者：
N.Tsuchida;N.Nagahisa and S. Harjo
本研究使用低碳TRIP钢进行室温蠕变试验，以阐明TRIP对恒定载荷下拉伸变形行为的影响。名义应变和应变速率随外加应力的增加而增加，在保温时间为3.0 × 104s左右时基本保持不变。恒载荷蠕变试验得到的真应变下形变诱发马氏体（α′）的体积分数大于拉伸试验得到的体积分数。在恒载荷蠕变试验过程中的原位中子衍射实验发现，在相同的外加应力下，蠕变试验中奥氏体（γ）相的相应变大于拉伸试验中的相应变。这意味着TRIP钢中γ相的相应变或真应力与蠕变和拉伸试验之间α′的体积分数之差有关。原位中子衍射实验还表明，TRIP钢在恒载荷蠕变试验中的晶格应变与γ<hkl>相和α相的晶粒无关。
This study investigated room-temperature creep tests using a low-carbon TRIP steel to clarify the TRIP effect on tensile deformation behavior under constant load. Nominal strain and strain rate increased with an increase in applied stress and those were almost stagnated at holding times of about 3.0 × 104s. The volume fractions of deformation-induced martensite (α′) at a given true strain obtained from constant load creep tests were larger than those from tensile tests. From the in situ neutron diffraction experiments during the constant load creep tests, the phase strain of the austenite (γ) phase in the creep tests was found to be larger than that in the tensile tests at the same applied stress. This means that the phase strain or true stress of theγphase in the TRIP steel was associated with the difference in the volume fraction ofα′ between the creep and the tensile tests. The in situ neutron diffraction experiments also showed that the lattice strains of the TRIP steel in the constant load creep tests were independent of <hkl> grains inγandαphases.