J.S. Ye
,
Z.R. Ye
,
A. Yang
金属学报(英文版)
A modified temperature-phase transformation-stress coupled 3D non-linear mathemat-ical model and a series of subroutines on the non-liner MARC (MARC Analysis Re-search Corporation) are developed. Then this modified model has been utilized to simu-late the heat treatment processes of 280 connecting rod of 16V280ZJ diesel locomotive.The simulation results are basically in agreement with the experiments, which testifythat the mathematical model and method are feasible. In addition, the simulationcan not only obtain the transient temperature and microstructure of heat treatmentprocess, but also provide a sound scientific basis for the heat treatment workers.
关键词:
non-linear
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null
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null
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J.S. Ye
金属学报(英文版)
280 connecting rod is one of the most important parts for 16V280ZJ diesel locomo-
tive, so it needs much better mechanical performance. However, the crack is often
generated at the middle section of connecting rod body on heat treatment process. A
temperature-phase transformation-stress coupled 3D non-linear mathematical model
has been developed to analyze the reasons of cracking. The simulation and experimen-
tal results show that the compressive stress on the cracking position is close to the
fracture stress of connecting rod and the reasons of crack are mainly contributed to
the carbon content excess of original material or the aging of quenchant.
关键词:
crack
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null
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HU Yu GONG Dian-yao
钢铁研究学报(英文版)
Based on influence coefficient method, using the software of roll elastic deformation simulation, the effect of entry crown on hot rolled strip shape was researched and analyzed. According to the real condition of certain domestic hot rolled strip factory, the unit crown change from the first stand to the last was calculated when entry crown of hot strip alters. The calculation result shows that the entry crown effect not obviously on the target strip crown at the exit of last stand with the strip shape control reference such as bending force keeping fixed. The reason of calculation was analyzed, the research work refers theory support to strip shape setup modeling and shape control.
关键词:
influence coefficient method;strip crown;crown effect rate;hot rolled strip
ZHANG Yun ZHAO Hong'en YAO Daping GAO Guozhong CHEN Jizhi HU Zhuangqi Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China[Originally published in ACTA METALL SIN(CHINESE EDN)25(3)1989 pp A161—A167. Associate Professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
110015
,
China
金属学报(英文版)
The relationship among the microstructures,properties and the phase transformation in Al-2.2Li-2.5Cu-0.2Mg alloy after various treatments have been studied by optical microscopy and TEM observations.It is verified that solution treated at 525℃ for 1h is saris- factory for this alloy in which all the alloying elements are dissolved in the α-Al matrix,and aging at 190℃ for 16 h is the peak-aged condition.The alloy subjected to treatment is strengthened only be T_1 phase.In overaged or underaged conditions,the alloy is strengthened by two phases,in this cases,the strengthening effect is smaller than that by one phase.The deformation prior to aging would develop the plasticity and do not decrease the strength of the experimental alloy.
关键词:
A1-Li alloy
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null
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null
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