Analysis of Forging Cracks during Hot Compression of Powder Metallurgy Nickel-Based Superalloy on Simulation and Experiment

被引：20
|
作者：
He, Guoai [1 ,2 ]
Liu, Feng [1 ,2 ]
Huang, Lan [1 ,2 ]
Jiang, Liang [1 ,2 ]
机构：
[1] Cent S Univ, State Key Lab Powder Met, Powder Met Res Inst, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, High Temp Mat Res Inst, Changsha 410083, Hunan, Peoples R China
来源：
ADVANCED ENGINEERING MATERIALS | 2016年 / 18卷 / 10期
关键词：
MICROSTRUCTURE; BEHAVIOR; OPTIMIZATION; FLOW;
D O I：
10.1002/adem.201600270
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot compression tests on a newly designed hot extrusion Nickel-based powder metallurgy superalloy are conducted at various deformation conditions. The contact friction coefficient (f) between the die and forged part is determined as 0.30-0.40 by analyzing the results of simulation and the real experiment. A new coefficient B is introduced to evaluate the bulging levels and relate the value of f. The critical strains to prevent peripheral cracks are found to relate closely to the processing parameters. Thermally induced porosity and MC type carbides of grain boundaries are the primary mechanism for inducing cracks. Examinations on microstructure of cracking demonstrate that the cracks propagate along grain boundaries. A model is proposed to illustrate the formation of fractures during hot forging.
引用
收藏
页码：1823 / 1832
页数：10
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