ABSTRACT

Controlled rolling and controlled cooling processes achieve high-strength alloys due to their combined effects on the grain refinement, dispersion, and phase transformations. This paper studies the dissolution of V in austenite by normalizing treatments. The samples were then annealed to form uniform, fine, and dispersed V-based precipitates which in turn facilitated subsequent phase transitions in the steel. The results showed that V fully dissolved into austenite when the steel was treated. Besides, when the steel was annealed, V precipitated in the form of V(C, N), and the V(C, N) precipitates promoted the formation of ferrite. At the same time, fine pearlite phases also formed, and the V(C, N) precipitates were distributed among the pearlite lamellae. The uniformly dispersed V(C, N) precipitates further regulated the microphase organization, refined the grains, and acted as the microalloying element, making the steel more uniform, and improving the mechanical properties of the steel.

摘要

受控轧制和受控冷却工艺由于它们对晶粒细化、分散和相变的综合影响而获得高强度合金。本文通过正火处理研究了 V 在奥氏体中的溶解情况。然后将样品退火以形成均匀、细小和分散的 V 基沉淀物，这反过来促进了钢中的后续相变。结果表明，当钢被处理时，V完全溶解到奥氏体中。此外，当钢退火时，V以V(C，N)的形式析出，V(C，N)析出促进了铁素体的形成。同时还形成细小的珠光体相，V(C,N)析出物分布于珠光体片层之间。均匀分散的 V(C, N) 沉淀进一步调节了微相组织，