The key transition described in this diagram is the of single-phase austenite (γ) to the two-phase ferrite plus carbide structure as temperature drops.
举一反三
- 【单选题】The types of short-circuit in three-phase system are three-phase short-circuit, two-phase short-circuit, two-phase short-circuit grounding and single-phase short-circuit grounding. When the three phases of the system are short-circuited, they are still in the symmetrical stated. Other types of shorted circuit are asymmetric short circuit. Which of the following types is a symmetrical short circuit? A. Single phsae ground short circuit B. Three phase short circuit C. Two phase short circuit D. Two phase ground short circuit
- During<br/>cooling of a material, when a single phase solid transforms directly<br/>to two-phase solid, this is called a ( ) reaction. A: isomorphous B: eutectic C: peritectic D: eutectoid
- For a neutral-unearthing system, during a bolted single line-to-ground fault, the non-fault phase voltage and the fault phase voltage are ()respectively. A: phase voltage and zero B: phase voltage and line-to-line voltage C: line-to-line voltage and phase voltage D: line-to-line voltage and zero
- The general structure of a phase model of negotiations involves:
- 贝氏体的微观结构由______和______组成。 A: ferrite and cementite B: austenite and ferrite C: austenite and cementite D: ferrite and pearlite