Song XIANG
,
Guoquan LIU
,
Yang LI
,
Changrong LI
,
ong WANG
,
null
,
null
,
null
,
null
,
null
材料科学技术（英）
Microalloying element Nb in low carbon steels produced by compact strip production (CSP) process plays an important role in inhibiting recrystallization, decreasing the transformation temperature and grain refinement. With decreasing the rolling temperature, dislocations can be pinned by carbonitrides and the strength is increased. Based on the two sublattice model, with metal atom sublattice and interstitial atom sublattice, a thermodynamic model for carbonitride was established to calculate the equilibrium between matrix and carbonitride. In the steel produced by CSP, the calculation results showed that the starting temperature of precipitation of Ti and Nb are 1340℃ and 1040℃, respectively. In the range of 890-950℃, Nb rapidly precipitated. And the maximum of the atomic fraction of Nb in carbonitride was about 0.68. The morphologies and energy spectrum of the precipitates showed that (NbTi) (CN) precipitated near the dislocations. The experiment results show that Nb rapidly precipitated when the temperature was lower than 970℃, and the atomic fraction of Nb in carbonitride was about 60%-80%. The calculation results are in agreement with the experiment data. Therefore the thermodynamic model can be a useful assistant tool in the research on the precipitates in the low carbon steels produced by CSP.
关键词:
Compact strip production
,
strip
,
production
,
niobium
,
low
,
car
杨世能
,
李生志
,
孙锋
,
单爱党
机械工程材料
研究了钒含量和0.22％铜对11Cr 2W低活化马氏体钢组织以及650℃下拉伸、蠕变性能的影响.结果表明:钒含量和0.22％的铜对钢的组织和M23C6相的尺寸没有明显影响,当钒的质量分数为0.105％时,基体中弥散分布的MX相最多且最为细小;当钒的质量分数从0.105％增加到0.203％时,试验钢的抗拉强度从325.2 MPa降低为289.4 MPa,蠕变寿命从370 h缩至251 h;添加0.22％的铜可以提高试验钢的蠕变寿命.
关键词:
低活化马氏体钢
,
组织
,
高温力学性能
,
拉伸性能
,
蠕变性能
