Effect of Rare Earth Addition on Dynamic Recrystallization and Precipitation Behavior of a Niobium-Containing Microalloy Steel
Effect of Rare Earth Addition on Dynamic Recrystallization and Precipitation Behavior of a Niobium-Containing Microalloy Steel
复制标题
稀土添加对含铌微合金钢动态再结晶和析出行为的影响
DOI：
10.4028/www.scientific.net/msf.762.189
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发表时间：
2013-07
期刊：
影响因子：
--
通讯作者：
栗冬雪
中科院分区：
文献类型：
--
作者：
王海燕;任慧平;杨慧;王世栋;栗冬雪
采用Gleeble热模拟试验机对添加稀土和不添加稀土的含Nb钢进行了热压缩试验。分析了不同温度下的应力-应变曲线，研究了动态回复和动态再结晶软化行为。用透射电子显微镜（TEM）观察了两种钢中析出相的形态、大小和数量。结果表明，对于实验用含铌钢，稀土的加入细化了晶粒。在40%的变形速率下，两种钢均未发生动态再结晶，在奥氏体和铁素体区，含稀土钢的变形抗力均高于不含稀土钢，而在较高的变形速率下，稀土钢的动态回复起始应变高于稀土钢，研究还表明，含稀土钢中的析出相数量比不含稀土钢中的多，这是由于稀土提高了奥氏体区的形核率，促进了Nb碳氮化物的析出长大。此外，稀土的加入还可以改变钢中碳的活度，从而促进铌微合金钢的沉淀强化。
Hot compression experiments were carried out on rare earth (RE) added and RE-free Nb-containing steels by using a Gleeble simulator. Stress-strain curves obtained at various temperatures were analyzed to investigate the dynamic recovery and dynamic recrystallization softening behaviours. Morphology, size and number of precipitates in the both steels were examined by means of transmission electron microscopy (TEM). The results showed that, for the experimental Nb-containing steel, the grain size was fined by the RE addtion. In general, dynamic recrystallization cant occur in two steel under 40% deformation rates, and the deformation resistance of RE-containing steel is higher than that of RE-free steel in both the the austenite and ferrite temperatures range.While under the higher deformation rate, the dynamic recovery starting strains of the RE addition steel are higher than that of RE-free steel.It is also shown that the number of precipitate in the RE-containing steel more than that in the RE-free steel, which is due to the RE increasing nucleation rate and promoting Nb carbonitrides precipitation growth in the austenite region. Furthermore, the carbon activity may change by the RE addition, and thereby promote the precipitation strengthening of Nb-microalloyed steel.
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影响因子：
4.6
作者：
M. Yan
通讯作者：
M. Yan
影响因子：
6.2
作者：
Wang, Long-Mei;Lin, Qin;Wang, Fu-Ming
通讯作者：
Wang, Fu-Ming
DOI：
10.4028/www.scientific.net/amr.189-193.1753
发表时间：
2011-02
期刊：
Advanced Materials Research
影响因子：
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作者：
H. Wang;H. Ren;Z. Jin;C. Zong
通讯作者：
H. Wang;H. Ren;Z. Jin;C. Zong
影响因子：
3.5
作者：
Shim, SI;Park, YS;Song, CB
通讯作者：
Song, CB
DOI：
10.1007/s11661-011-0895-5
发表时间：
2012-02-01
影响因子：
2.8
作者：
Miao, C. L.;Shang, C. J.;Subramanian, S. V.
通讯作者：
Subramanian, S. V.