Question 6 of 454

The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called _________.

Answer

Suggested Answer

The suggested answer is D.

The sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation is called brittle fracture. This type of fracture is characterized by the material breaking without significant plastic deformation, making 'Brittle Fracture' the correct term.

Question 7 of 454

What structure is 409 stainless steel?

Answer

Suggested Answer

The suggested answer is D.

409 stainless steel is classified as a ferritic stainless steel. Ferritic stainless steels are primarily composed of iron and chromium and are known for their good corrosion resistance and formability. Types such as 405, 409, 410S, 430, 442, and 446 are all part of this family, making option D the correct answer.

Question 8 of 454

Low alloy steels contain a maximum of _______ chrome.

Answer

Suggested Answer

The suggested answer is D.

Low alloy steels are defined as steels which have up to 9% chrome content. This maximum level of chromium helps improve characteristics like high temperature strength and creep resistance, while remaining within the classification of low alloy steel.

Question 9 of 454

Which of the following can be affected by 885º F Embrittlement?

Answer

Suggested Answer

The suggested answer is E.

885º F embrittlement, also known as sigma phase embrittlement, occurs predominantly in ferritic stainless steels such as the 400 series (which includes 410 SS and 430 SS) and duplex stainless steels like Alloy 2205. Austenitic stainless steels like the 300 series (including 308 SS) are generally not affected by this phenomenon. Therefore, the materials that can be affected by 885º F embrittlement include 410 SS, 430 SS, and Alloy 2205, making A, B, and D the correct options.

Question 10 of 454

For 5Cr-0.5Mo, what is the threshold temperature for creep?

Answer

Suggested Answer

The suggested answer is B.

The threshold temperature for creep for the 5Cr-0.5Mo alloy is 800º F. This is the temperature at which the material begins to experience significant creep, which is a time-dependent deformation under stress at high temperature.