摘要
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。
The austenite grain growth and precipitation behavior of pre-eutectoid ferrite in phase transformation of two kinds of microalloyed medium carbon steels composed of 0.3%carbon, 1.5%manganese, 0.1%vanadium with different sulfur, 0.010%and 0.068%, have been investigated on Gleeble 2000 thermomechanical simulator. The results obtained are as follows: MnS particles can be dispersed in a large number as intragranular ferrite transformation sites, these particles pin the austenite grain boundaries and keep grains fine during reheating,the austenite grain size in steel of 0.068 sulfur is less 15～20 μm than that in steel of 0.010%sulfur. For the reasons, compared steel with a sulfur addition of 0.010%, ferrite nucleation rate is higher and growth rate lower in steel of 0.068%sulfur, so the fine-grained structure can be obtained in steel of 0.068%sulfur.
出处
《汽车工艺与材料》
1999年第12期14-18,共5页
Automobile Technology & Material
基金
国家"九五"重点科技攻关项目!(项目号95 -527-02 -01)
关键词
非调质钢
晶内铁素体
热模拟
硫含量
汽车材料
Microalloyed medium carbon steel
Intragranular ferrite
Hot-simulation
Sulfur content
