题目内容

Low carbon steels are not susceptible to hydrogen induced cracking due to their low carbon content.

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High carbon steels are susceptible to solidification cracking because their carbon content is high.

Main alloying elements in QTLA steels include ().

A. Mn
B. Cr
C. Mo
D. V
E. 2-2-1
F. 弹幕

Normally, microstructures of QTLA steels include ()

A. lath martensite
B. lower bainite
C. upper bainite
D. ledeburite
E. 2-2-1
F. 弹幕

Normally, we'd better pay more attention to () when we weld plain carbon steels.

A. solidification cracking
B. hydrogen induced cracking
C. toughness decrease
D. reheat cracking
E. 2-1-2
F. 期末

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