题目内容

High-carbon steels are susceptible to hydrogen induce cracking because they are with high content of ().

A. carbon
B. sulphur
C. chromium
D. nickel
E. 2-1-2
F. 期末

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After welding, QTLA steels can be tempered automatically because they possess () martensite transformation starting temperature and the cooling rate is ()

A. high/slow
B. high/rapid
C. low/slow
D. low/rapid
E. 2-2-1
F. 期末

Some types of QTLA steels are susceptible to liquation cracking because they contain a lot of ().

A. Ni
B. P
C
D. Cr
E. 2-2-2
F. 期末

To avoid hydrogen induced cracking, we have to limit the intrusion of () during welding.

A. H
B. C
C. S
D. P
E. 2-1-2 2-2-2 2-3-2
F. 期末

Comparing with QTLA steels, HTLA steels are with () hardness and () toughness.

A. higher/lower
B. higher/higher
C. lower/lower
D. lower/higher
E. 2-3-1
F. 期末