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J Mater Sci Technol  1999, Vol. 15 Issue (06): 555-558    DOI:
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Microstructure, Impact Toughness and TEM Analysis in the CGHAZ of HQ130 High Strength Steel
Zengda ZOU, Yajiang LI, Shike YIN
Shandong University of Technology, Jinan 250061, China
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Abstract  Microstructure and impact toughness in the coarse grain heat-affected zone (CGHAZ) of HQ130 high strength steel were studied by using the weld thermo-simulation test. Fracture morphology and fine structure in the CGHAZ were analyzed by means of SEM, TEM and electron diffraction. Experimental results indicated that the impact toughness and hardness in the CGHAZ (Tm= 1350 ℃) decreased with increasing cooling time (t8/5), and fracture morphology changed from dimple fracture into cleavage fracture. The reason for the toughness decrease is the formation of upper bainite. During application, the welding heat input should be strictly limited, to reduce brittleness in the CGHAZ of HQ130 steel.
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Received:  20 August 1998     
Corresponding Authors:  Yajiang LI   

Cite this article: 

Zengda ZOU, Yajiang LI, Shike YIN. Microstructure, Impact Toughness and TEM Analysis in the CGHAZ of HQ130 High Strength Steel. J Mater Sci Technol, 1999, 15(06): 555-558.

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