The high-temperature deformation behavior of Q345 steel is detected by a Gleeble-3800 thermal simulator. The Arrhenius constitutive equation for high-temperature flow stress and the dynamic recrystallization model are constructed. With the secondary development technology, customized modifications are made on existing Deform-3D software. The constructed constitutive model and dynamic recrystallization model are embedded into Deform-3D to realize the secondary development of Deform-3D. The grain size and volume percentage distribution of dynamic recrystallization are obtained by simulating the shear connection process at high temperature and high speed. The results show that the constitutive equation and the dynamic recrystallization model constructed in this paper can be used to predict the evolution of the microstructure. The difference between the prediction results and the experimental data is about 3%. The accuracy of Arrhenius constitutive equation, dynamic recrystallization model and the feasibility of software secondary development are verified.

Zr-6Al-0.1B alloy rich in Zr₃Al phase is prepared by hot-pressing sintering. The thermal deformation behavior of sintered Zr-6Al-0.1B is analyzed by isothermal compression tests at deformation temperatures of 950, 1050, and 1150 °C with strain rates of 0.01, 0.1, and 1 s⁻¹. The results indicate that at the early stage of thermal deformation, the stress increases rapidly with the increase of strain and then reaches the peak value. Subsequently, the stress decreases with the increase of strain under the softening effect. On the whole, the true stress-strain curve shifts to the high stress area with the increase of strain rate or the decrease of deformation temperature, so the sintered Zr-6Al-0.1B alloy belongs to the temperature and strain rate sensitive material. For the microstructure evolution of sintered Zr-6Al-0.1B during the isothermal compression, the high strain rate can improve the grain refinement. However, because sintered Zr-6Al-0.1B is a low plastic material, too high strain rate will exceed the deformation capacity of the material, resulting in an increase in defects. The increase of deformation temperature also contributes to grain refinement, but when the temperature is too high, due to the decomposition of Zr₃Al phase, the deformation coordination of the material decreases, leading to the increase of the probability of the occurrence of defects. This study verified the feasibility of hot-pressing sintering to prepare Zr-6Al-0.1B alloy rich in Zr₃Al phase and laid the foundation of “hot-pressing sintering + canning hot-extrusion” process of Zr-6Al-0.1B alloy components.

In order to analyze the tensile stage of the sample by magnetic memory detection technology, a variety of information entropy is introduced to process and analyze the magnetic memory signal. The information entropy of the magnetic signal under different tensile loads was calculated, and used as a criterion to judge the state of the tensile sample. An information fusion strategy coupled with Dempster synthesis rule was proposed to improve the accuracy and reliability of the state recognition. Based on the Dempster synthesis rule and D-S evidence theory, a state identification algorithm was developed by using Matlab software, which can easily obtain the deformation state of different regions on the sample surface. The experimental results show that the data analysis method can quickly and accurately judge the tensile stage of the sample.

The defects of incomplete tooth, low tooth height and big pitch are easy to produce, when the thread shaft is rolled by cross wedge rolling. The forming defects of teeth are researched by theoretical analysis and numerical simulation, the causes of producing tooth defects are analyzed, and forming process is researched by optimizing the die structure. The open structure of the die is designed as the closed structure on the end of the thread tooth. In addition, the tooth width of the die is optimized from equal width mode to variable width mode. Thus higher quality teeth are obtained and tooth defects are eliminated. The research results have a good reference for accurately forming thread shaft.