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通过在Gleeble-2000热模拟试验机上的模拟锻造加热和冷却试验,研究了含硫0.010%和0.068%的两种0.3%C-1.5%Mn-0.1%V非调质钢再加热过程中的奥氏体晶粒长大倾向和冷却过程中先共析铁素体的形核长大行为。结果表明:添加硫可阻止奥氏体晶粒长大,相同条件下,含硫0.068%钢的奥氏体晶粒尺寸比含硫0.010%钢小15～20μm;含硫0.068%钢组织中有大量晶内铁素体,对奥氏体晶粒具有分割作用,且晶内铁素体核心含MnS粒子;与含硫0.010%钢相比,含硫0.068%钢的先共析铁素体形核速率高,长大速率低,先共析铁素体量较多,因而含硫0.068%的钢可获得细小弥散的铁素体/珠光体组织,韧性较好。
Through simulating forging heating and cooling tests on a Gleeble-2000 thermal simulator, the effect of austenite on the austenitizing properties of two types of 0.3% C-1.5% Mn-0.1% V non-quenched and tempered steel with sulfur content of 0.010% and 0.068% The tendency of grain growth and the pro-eutectoid ferrite nucleation and growth during the cooling process. The results show that the addition of sulfur can prevent austenite grain growth. Under the same conditions, the austenite grain size of 0.068% sulfur is 15 ~ 20μm smaller than that of 0.010% A large amount of intragranular ferrite has a segmental effect on the austenite grains and the intragranular ferrite core contains MnS particles. Compared with the 0.010% sulfur-containing steel, the pro-eutectoid ferrite nuclei of 0.068% sulfur High rate, high rate of growth is low, the pro-eutectoid ferrite volume is more, so the sulfur content of 0.068% of the steel can obtain finely dispersed ferrite / pearlite, good toughness.