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| 1 | S31254超级奥氏体不锈钢析出相演变及微观表征显示文摘利用热力学计算了S31254超级奥氏体不锈钢在500~1 200℃温度范围内的平衡态析出相,并结合热模拟试验、扫描电镜、透射电镜等方法,对不同析出物的析出行为进行了表征和分析。结果表明,S31254不锈钢奥氏体基体中可存在的第二相包括σ、χ、Laves等金属间相,Cr_(2)N、π型氮化物相以及M_(23)C_(6)型碳化物相,高Mo、高N、高Cr含量是该钢析出相种类复杂的主要原因;试验钢具有高的第二相析出倾向,σ相开始析出温度约为1 150℃,而在900~800℃区间可发现χ相和σ相的转变,χ相更易作为一种稳定相存在;析出相的析出位置和形貌呈现不同特点,晶界析出主要为σ相、χ相和Laves相,而晶内主要有呈针状和块状分布的χ相和呈棒状析出的Cr_(2)N相。 | 张亚彬 任建斌 王锦永 左晶晶 武瑞斌 丰涵 | 2021 | 中国冶金2021，31，12： | 7 |
| 2 | Flow characteristics and hot workability of a typical low-alloy high-strength steel during multi-pass deformation显示文摘Heavy components of low-alloy high-strength(LAHS) steels are generally formed by multi-pass forging. It is necessary to explore the flow characteristics and hot workability of LAHS steels during the multi-pass forging process, which is beneficial to the formulation of actual processing parameters. In the study, the multi-pass hot compression experiments of a typical LAHS steel are carried out at a wide range of deformation temperatures and strain rates. It is found that the work hardening rate of the experimental material depends on deformation parameters and deformation passes, which is ascribed to the impacts of static and dynamic softening behaviors. A new model is established to describe the flow characteristics at various deformation passes. Compared to the classical Arrhenius model and modified Zerilli and Armstrong model, the newly proposed model shows higher prediction accuracy with a confidence level of 0.98565. Furthermore, the connection between power dissipation efficiency(PDE) and deformation parameters is revealed by analyzing the microstructures. The PDE cannot be utilized to reflect the efficiency of energy dissipation for microstructure evolution during the entire deformation process, but only to assess the efficiency of energy dissipation for microstructure evolution in a specific deformation parameter state.As a result, an integrated processing map is proposed to better study the hot workability of the LAHS steel, which considers the effects of instability factor(IF), PDE, and distribution and size of grains. The optimized processing parameters for the multi-pass deformation process are the deformation parameters of 1223–1318 K and 0.01–0.08 s^(-1). Complete dynamic recrystallization occurs within the optimized processing parameters with an average grain size of 18.36–42.3 μm. This study will guide the optimization of the forging process of heavy components. | Mingjie Zhao Lihong Jiang Changmin Li Liang Huang Chaoyuan Sun Jianjun Li Zhenghua Guo | 2024 | International Journal of Minerals,Metallurgy and Materials2024，31，2： | 0 |
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