Activated dynamic strain aging of a TRIP590 Steel at 300 degrees C and low strain rate and relationship to structure
Activated dynamic strain aging of a TRIP590 Steel at 300 degrees C and low strain rate and relationship to structure
复制标题
TRIP590 钢在 300 摄氏度和低应变率下的激活动态应变时效及其与结构的关系
DOI：
10.1016/j.msea.2015.08.039
复制
发表时间：
2015
期刊：
影响因子：
6.4
通讯作者：
Zuo L.
中科院分区：
文献类型：
--
作者：
Shen Y. F.;Wang P. J.;Liu Y. D.;Misra R. D. K.;Zuo L.
对相变诱发塑性(TRIP)钢进行了亚温退火和贝氏体偏析处理，以阐明在−70°C到300°C和10−3~10−1s−1的应变速率范围内对力学性能的影响以及与组织有关的行为。在−70°C~150°C温度范围内，在恒应变速率下，屈服强度和抗拉强度都随着变形温度的降低而增加。在不同的应变速率下，室温下的延伸率最大，而在−70℃的最低温度下，强度和塑性的乘积最高。出人意料的是，在300℃的测试样品中观察到了锯齿状流动，这可归因于动态应变时效(DSA)，这种影响随着应变率的降低而变得更加明显。纳米析出物通过抑制位错的回复和湮灭来促进塑性变形中位错密度的增加，导致应力随着温度的升高而增加，由于绝热加热，这种影响随着应变速率的增加而减小。
Transformation-induced plasticity (TRIP) steel was subjected to intercritical annealing and bainite partitioning to elucidate the impact on mechanical properties at temperatures in the range of −70 °C to 300 °C and strain rates of 10−3to 10−1s−1and the behavior related to structure. At temperatures in the range of −70 °C to 150 °C, both the yield strength and tensile strength increased with decrease in the deformation temperature at a constant strain rate. The elongation-to-failure was maximum at room temperature, while the product of strength and ductility was highest at the lowest temperature of −70 °C at various strain rates. Unexpectedly, the serrated flow was observed for specimens tested at 300 °C, which is attributed to dynamic strain aging (DSA), an effect that became more pronounced with decrease in strain rate. The nanosized precipitates facilitated increase in dislocation density during plastic deformation by restraining recovery and annihilation of dislocations, leading to increase in stress with increase in temperature, an effect that decreased with increase in strain rate because of adiabatic heating.