题目内容

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

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HTLA steels are susceptible to reheat cracking because they contain a lot of ()

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

To avoid liquation cracking, during the welding of HTLA steels, we'd better to pay attention to the content ratio of () to ()

A. Ni/Mn
B. Ni/Si
C. Mn/Si
D. Si/C
E. 2-3-2
F. 期末

HTLA steels are ().

A. medium carbon
B. low carbon
C. high alloy
D. high carbon
E. 2-3-1
F. 期末

Microstructures of plain carbon steels include ().

A. ferrite
B. pearlite
C. martensite
D. ledeburite
E. 2-1-1
F. 期末