Recrystallization, Precipitation Behaviors, and Refinement of Austenite Grains in High Mn, High Nb Steel
Recrystallization, Precipitation Behaviors, and Refinement of Austenite Grains in High Mn, High Nb Steel
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DOI：
10.1007/s11661-011-0895-5
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发表时间：
2012-02-01
影响因子：
2.8
通讯作者：
Subramanian, S. V.
中科院分区：
文献类型：
--
作者：
Miao, C. L.;Shang, C. J.;Subramanian, S. V.
通过对三种不同Nb含量的高Mn钢进行应力松弛试验、物理冶金模拟、观察奥氏体晶粒和析出相等一系列实验，研究Nb对高Mn钢再结晶和析出行为的影响。结果表明，在高Mn、高Nb钢中存在由完全静态再结晶（SRX）引起的晶粒细化的新变形温度范围，而较细的初始晶粒尺寸可以加速缓慢的SRX动力学。在此变形温度范围内，析出的作用较弱，不能有效地阻止SRX形核，但溶质阻力仍大，足以减缓生长速度。因此，在较低温度下，低C、高Mn、高Nb线管钢的轧制过程中，由于高溶质阻力作用，晶粒的孕育时间较短，再结晶成核均匀，晶粒的粗化速度较慢。
Through a series of experiments conducted on three kinds of high Mn steels with different Nb content, including stress relaxation tests, physical metallurgical modeling, and observation of prior austenite grains and precipitates, the effect of Nb on recrystallization and precipitation behaviors were investigated. The results indicate the existence of a novel deformation temperature range for grain refinement resulting from complete static recrystallization (SRX) in high Mn, high Nb steel, whereas slow SRX kinetics can be accelerated by a finer initial grain size. In this deformation temperature range, the effect of precipitation is too weak to prohibit SRX nucleation efficiently, but solute drag is still large enough to slow down growth rate. As a consequence, shorter incubation and homogeneous recrystallized nucleation can be realized at relative low temperature, and the coarsening rate of grains is much slower because of the high solute drag effect in the rolling of low C high Mn, high Nb line pipe steel.