QUESTION 5 Why does pearlite have a layered structure? because it is folded many
ID: 1712103 • Letter: Q
Question
QUESTION 5 Why does pearlite have a layered structure? because it is folded many times during cold working O because carbon atoms need to diffuse only a short distance to form this structure o because only auste nite can accommodate carbon in the inte rstiti al space because the dislocations move in slip bands QUESTION 6 What starts to grow when steel undergoes fatigue failure? O cracks o hydrogen pathways dislocations grain size QUESTION 7 Pearlite consists of what two phases? auste nite and ferrite pearlite and fe rrite iron carbide and auste nite ferrite and iron carbide QUESTION 8 Which of the following is true about the density of wood? a. a tree is densest near the base in the outer layers where bending stess is greatest o b. tree species with thicker cell walls will have a higher overall density c. overall density of the tree is controlled by cell wall density O d. all of the above e. a) and b)Explanation / Answer
5) Option B is correct. It forms layered structures because carbon atoms needs to diffuse only a shorter distance no need of long diffusion.
6) Option A is correct. When fatigue is applied crackswill devvelop. Fatigue means continuous application of load.
7) Option D is correct. It is alternate layers of ferrite and cementite or iron carbide.
8) Option D is correct. Tree i denesens nerar base, if thicker cell walls, higher desity, and overall density is controlled by cell wall density.