Numerical Simulation and Technological Parameter Optimization for Quenching Process of a Gas Turbine Compressor Disk Based on Metallo-Thermo-Mechanics

Thermal, mechanical and microstructural phenomena are involved in the process of steel quenching. Based on the coupled metallo-thermo-mechanics theory, a calculation model has been developed in this study to simulate the quenching process of a gas turbine compressor disk by finite element method. The thermal physical and mechanical properties were treated as a functions of temperature. Moreover, a series of subroutines were developed on the MARC software platform. Consequently, simulated results on temperature, internal stress and distortion during the quenching were illustrated. With the aid of the simulated results, an optimum quenching scheme was proposed. The quenching process simulated in this study appears to be a promising tool in design of heat-treatment processing parameters for gas turbine compressor disks.     

热处理条件对30CrNiMoV钢力学性能的影响

研究了不同热处理条件对３０ＣｒＮｉＭｏＶ高强钢力学性能的影响。实验结果表明,淬火温度为８６０～９２０℃,回火温度为５５０～６００℃时,该钢的低温冲击韧性、断裂韧性和抗拉强度可获良好的匹配。疲劳裂纹扩展速率在稳定扩展区对组织结构不敏感,而在门槛区或近槛区,则对组织结构敏感。     

汽轮机主油泵轴断裂分析

采用化学分析、力学性能测试和金相检验等手段，对某电站汽轮机主油泵轴的早期断裂进行了分析。结果表明，泵轴未经有效的热处理、边缘存在较大的夹杂物以及键槽未加工R角是导致泵轴断裂的主要原因。     

锅炉压力容器用SA515Gr70钢的组织与性能研究

通过钢的成分的设计，研制了一种用于制造锅炉汽包和压力容器的奥氏体粗晶粒钢，这种钢经一定热处理后，可获得高强度高韧性的使用要求。     

新型预硬塑料模具钢调质工艺研究

通过端淬试验及调质处理试验室模拟试验,对P20和718预硬型塑料模具钢的淬透性及调质工艺进行了研究和探讨.结果表明:P20和718的淬透性均较高,718比P20淬透性更高,更适合制作大型塑料模具;P20和718的最佳调质工艺参数为860℃淬火,560～590℃回火.     

40Cr10Si2Mo气阀钢的调质工艺研究

研究了不同热处理工艺后40Cr10Si2Mo气阀钢力学性能、调质硬度,以及在要求技术条件下的力学性能、调质硬度、金相组织与不同热处理温度之间的关系,找到了满足技术条件要求最佳的热处理工艺制度。     

40Cr汽车钢板U型螺栓调质开裂原因分析

在汽车钢板u型螺栓生产过程中,调质后发现工件都有纵向开裂现象,造成产品报废。本文对报废产品取样进行了化学成份、金相高、低倍、硬度等项目的检测分析。分析发现螺栓用原材料工件为∮28mm正是处于最危险淬裂尺寸范围,其化学成份碳、锰、铬等元素均处于标准要求的上限,从而提高了其淬透性,在淬火冷却时,表面拉应力超过材料的断裂强度造成开裂。     

Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys

The effect of quenching conditions on phase transformation characteristics and microstructural features of Cu–Al–Ni–Ti shape memory alloys (SMAs) have been studied. The alloys were synthesised via conventional powder metallurgy process using elemental metal powders. Four different quenching techniques, such as (a) two-step quenching, first to 100°C and then to 0°C; (b) two-step quenching, initially to 40°C and later to 0°C; (c) direct quenching to 40°C and (d) direct quenching to 0°C, were used. The microstructural features and phase transformations that the alloys had undergone were studied using FE-SEM and XRD techniques. The martensitic phase transformation analyses were carried out by differential scanning calorimeter while the mechanical properties were studied by microhardness and flexural bending tests. The results obtained clearly indicate that the quenching routes followed have a remarkable influence on the properties of Cu-based SMAs.     

现代化中厚板热处理机组及其使用效果

随着工业技术的不断发展,钢板表面质量好坏已成为钢材销售市场考虑的一个重要问题,热处理炉是影响高牌号钢板表面质量的关键因素。本厂由国外引进了世界一流技术水平的辐射加热无氧化辊式热处理炉及连续辊式淬火机,又着重介绍了主要设备的技术参数和技术说明。从生产应用情况来看,不但解决了钢板表面质量问题,而且有效地提高于钢板的综合质量指标。     

钢的真空热处理的进展

本文叙述了钢的真空热处理发展的原因及气淬真空炉在热处理中的应用。