题目内容

Peak temperature in HAZ determines the microstructure of the joint of carbon steels.

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

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