Journal of Welding and Joining
- Volume 3 Issue 1
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- Pages.22-31
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- 1985
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- 2466-2232(pISSN)
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- 2466-2100(eISSN)
A Study on Hot Straining Embrittlement of Coarse Grained HAZ in Steel Weldments
강 용접열영향부 조립역의 열변형취화에 관한 연구
Abstract
Hot straining embrittlement is one of the most important factors which cause the brittle fracture initiation even in the service temperature in the case of mild steel and high tensile steel. Therefore it is necessary to analyze thoroughly the hot straining embrittlement occurred in weld HAZ of the structural steels. The behaviors of plastic deformation and fracture toughness at the notch tip of the hot strained weld HAZ in structural steels (SB 41 KS, SA 588-Grade A ASTM) have been studied by the recrystallization technique and crack opening displacement (COD) test method. The obtained results are summarized as follows; 1. The plastic zone is formed at the notch tip of weld HAZ owing to nomotonic and cyclic hot stran, and the maximum plastic strain increases with the accumulated hot straining amounts. 2. The distribution of the effective strain at the plastic deformed zone in HAZ can be determined as follows; (.epsilon. over bar
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