共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
5.
利用Gleeble 1500热模拟实验机研究了不同等温时间对16Mn和15MnVN钢γ→α相变的影响,分析了微合金元素V对γ→α相变的影响规律。结果表明:微合金元素的氮化物VN缩短了碳锰钢γ→α相变孕育期,加速了碳锰钢γ→α相变铁素体的形核过程。 相似文献
6.
7.
8.
9.
10.
11.
12.
13.
14.
A multi‐scale approach based on the asymptotic homogenization method of periodic material structures is applied here to determine the effective thermo‐elastic properties of 3D steel microstructures, which have been calculated by phase‐field simulations. A multiphase‐field model, coupled to thermodynamic databases, is used to evaluate the microstructure evolution during the austenite to ferrite phase transformation of low carbon Fe‐C‐Mn steel. In order to derive effective mechanical properties, geometrical information about the grains, their phase properties and crystallographic orientations are transferred to the homogenization tool. Effective cubic Young and shear modules and Poisson coefficients are predicted for different ferrite volume fractions. Moreover, the volume change is derived as function of the phase fractions, leading to a calculated dilatometer curve. The effects of the thermal shrinkage and the volume expansion caused by the phase transformation are taken into account. 相似文献
15.
16Mn连涛坯进行控轧时,按铸坯碳当量的上限和下限,分别采用两种不同的控轧制度。在邯钢中板分厂试轧的结果,轧材合格率均达到96%以上,投产后轧材合格率达到98%以上。 相似文献
16.
强磁场对铁基合金相变温度和显微组织的影响 总被引:2,自引:0,他引:2
The effect of a high magnetic field up to 30 T on phase transformation temperature and microstructure of Fe-based alloys has been reviewed. A high magnetic field accelerates ferrite transformation, changes the morphology of the transformed microstructures and increases the As and A1 temperature. In a magnetic field of 30 T, the A1 temperature increases by about 37.1℃ for Fe-0.8C, the A3 temperature for pure Fe increases by about 33.1 ℃. The measured transformation temperature data are not consistent with calculation results using Weiss molecular field theory. Ferrite grains are elongated and aligned along the direction of magnetic field in Fe-0.4C and Fe-0.6C alloys by ferrite transformation, but elongated and aligned structure was not found in pure Fe, Fe-0.05C alloy and Fe-1.5Mn0.11C-0.1V alloy. 相似文献
17.
18.
磁场处理对微合金钢由奥氏体向铁素体的转变过程产生影响,主要体现在铁素体的形核率和晶粒长大速度两个方面.磁场处理增加了铁素体的形核率,同时也提高了晶粒的长大速度.由于磁场对铁素体形核率的影响效果显著,缩短了相变时间,最终得到细晶组织. 相似文献
19.
20.
通过测量磁化曲线、电阻-温度关系和热分析等手段,研究了磁场对镍基铁磁合金试样Ni-Mn-Ga相变的影响.结果表明:在磁场作用下相变温度升高了约1.5 K,具有明显的磁场影响特征.利用马氏体相变热力学理论,研究了磁场对镍基铁磁合金化学自由能和非化学自由能与温度的变化关系,建立了其作用的数理模型,并与实验结果比较后基本吻合. 相似文献