Cheng LÜ
材料科学技术（英文）
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.
关键词:
Quenching stress
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stress
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Distortion
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Finite
,
eleme
Hongyuan FANG
,
Chenglei FAN
,
Jianguo YANG
,
Ming LI
,
Zhen LUO
,
Xianzhong HOU
材料科学技术（英文）
A new type of compound conduit is designed and the finite element method (FEM) is applied to analyze the mechanical performance of a typical compound conduit. The results of the numerical simulation confirm that the distributions of the strain, stress and the flexure distortion of the conduit are reasonable under the working conditions, and the stress and strain are continuous at the interface of the crust and the pipe liner. The conduit can endure 7.4 times of the working load before break, which fits well with that of the experiment and means that the conduit has good ability to bear overload. The peak value of the flexure distortion of the conduit (6 m) is about 3 mm in the middle bottom of the pipeline, which also accords well with that of the experiment.
关键词:
Compound conduit
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null
,
null
,
null
Lugui CHEN
,
Yong LING
,
Xiuhong KANG
,
Lijun XIA
,
Dianzhong LI
材料科学技术（英文）
A large-scale, thin wall duplex stainless steel impeller with complex geometry was deformed severely and unpredictably during casting and heat treatment processes resulted in dimensional failure for the final part. In this paper, the distortion of the impeller during casting and heat treatment was calculated. A commercial software, Experto-ViewCast, was used to simulate the transient heat transfer, solidification and mechanical behaviors during the casting and the heat treatment process. The coupled set of governing differential equations for mass, energy and mechanical balance were solved by finite control volume and finite element method. A thermoelastic-visco-plastic rheological model was used to compute the constrained shrinkage of the casting. At each time increment, a coupling of the heat transfer and mechanics was performed. Comparison of the experimental measurements with the model predictions showed good agreement. From the calculated displacements of key points of the blade, the proper inverse displacements were determined to provide an optimum casting pattern and to achieve a uniform and reasonable machining allowance for both faces of the blade.
关键词:
Numerical simulation
,
null
,
null
,
null
,
null
杨海龙
,
胡胜泊
,
王晓婷
,
胡子君
,
王晓艳
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2016.05.008
针对刚性隔热瓦涂层制备过程中高温烧结热处理所导致的变形问题,在对其变形机制分析的基础上,探索了变形控制方法.研究结果表明,刚性隔热瓦在涂层制备过程中的变形来源于涂层玻璃相降温过程中收缩所导致的对于基体材料的压应力.与常规方法相比,仅将涂覆涂层面置于高温环境中烧结热处理,或者采用厚度较大的基体材料成型涂层后再进行二次加工减薄至最终所需厚度,均可明显降低变形量,变形量随基体材料厚度的增加而减小.当这两种方法并用时可进一步降低变形量.
关键词:
刚性隔热瓦
,
涂层
,
变形
Jiansong YE
,
Yikang LIU
,
Yuanjun ZHOU
材料科学技术（英文）
A temperature phase transformation stress coupled 3D nonlinear mathematical model has been proposed for forecasting distortion of workpieces on the cooling processes in this paper. Moreover, a series of subroutines were developed on the MARC (analysis research corporation) software platform and the simulation result is basically identical with the experimental one that measured on the workpiece shape with LEITZ equipment. This verifies that the mathematical model and method are feasible.
关键词:
Mathematical model
,
null
,
null
