摘要
通过热模拟试验方法对V-N微合金锻钢的奥氏体连续冷却转变进行研究,结果表明,在较低的冷却速度下,V-N微合金锻钢发生γ→α+р转变,且珠光体比例和晶粒度随着冷却速度提高而增多、增大,但在高的冷却速度下,V-N微合金锻钢直接发生γ→M转变,最终产物为马氏体组织;同时,V-N微合金锻钢在连续冷却转变过程中会析出V(C,N)等析出相,在较低的冷却速度下,这些析出相数量多而细小,但当冷却速度增大到一定程度后(≥10℃/s),共析相变被抑制,第二相的析出被抑制。
Austenite continuous cooling transformation of V-N microalloyed forging steel used for automobile connecting rods made by splitting method was investigated by thermo-mechanical simulation experiments. The resuhs show that phase transformation occurs from austenite to ferrite and pearlite at lower cooling rates, and with increasing cooling rates, peadite content increases and grains are refined; however, at higher cooling rates, martensitic transformation occurs, its final microstructure is martensite. At the same time, V （C, N ） precipitated phases precipitate during continuous cooling transformation, and at lower cooling rates, the precipitated phase number is much and fine, but when the cooling rates increase to a certain value, the eutectoid transformation is inhibited, the second phase precipitation is restrained.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第8期45-48,共4页
Heat Treatment of Metals
关键词
连续冷却转变
V-N微合金锻钢
显微组织
析出相
continuous cooling transformation
V-N microalloyed steel
microstructure
precipitates
