Time filter

Source Type

Sun S.-L.,Tangshan Institute of the Supervision and the Test of the Product Quality | Wang Y.,Tangshan Institute of the Supervision and the Test of the Product Quality | Chen J.,Tangshan Institute of the Supervision and the Test of the Product Quality | Liu Z.-G.,Tangshan Institute of the Supervision and the Test of the Product Quality | And 2 more authors.
Zhuzao/Foundry | Year: 2012

Cracks were found in the castings of gear shifting forks. To study the causes of cracks, chemical analysis, hardness tests and metallographic examinations were carried out. The results show that there are defects such as shrinkage, inter-dendrite slag inclusion and segregation in the shifting fork; and the generation of cracks can be attributed to insufficient cooling during quenching, uneven higher frequency quenching layer, decarburized layer, and relatively high hardness and stress.


Bian Y.-J.,Tangshan Institute of the Supervision and the Test of the Product Quality | Sheng J.-B.,Tangshan Institute of the Supervision and the Test of the Product Quality | Zhang N.,Tangshan Institute of the Supervision and the Test of the Product Quality | Chen J.,Tangshan Institute of the Supervision and the Test of the Product Quality | Shi W.,Tangshan Institute of the Supervision and the Test of the Product Quality
Jinshu Rechuli/Heat Treatment of Metals | Year: 2010

The reasons for the fracture of 17Cr2Ni2Mo steel gear shaft made of 850 mm medium-width strip steel for hot continuous rolling mill were comprehensively analyzed by using fracture, chemical composition, hardness, metallographical examination and mechanical properties analysis methods. The results show that the fracture can be attributed to the following major reasons ; over-large amount of non-metallic inclusions, not enough forging ratio, banded structure, chemical composition segregation, coarse martensite, precipitation of brittle phase tertiary cementite along the crystal boundary and low hardness of axis core.

Loading Tangshan Institute of the Supervision and the Test of the Product Quality collaborators
Loading Tangshan Institute of the Supervision and the Test of the Product Quality collaborators