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中碳钢温变形过程的组织演变包含铁素体动态回复、再结晶和渗碳体的析出球化等过程.采用Gleeble1500热模拟试验机研究了初始组织形态对含碳0.48%(质量分数)的中碳钢在温变形中上述复杂过程的影响.结果表明:初始组织为珠光体+先共析铁素体的试样在温加工变形中渗碳体层片发生了扭折、溶断到逐渐球化的过程,在铁素体回复再结晶的同时伴随着细小弥散的渗碳体颗粒从过饱和铁素体中析出,得到微米级铁素体晶粒和颗粒状渗碳体弥散分布的复相组织,但等轴状铁素体晶粒与弥散的渗碳体颗粒沿变形方向呈带状不均匀分布.温加工变形促进初始组织为马氏体的中碳钢中渗碳体析出和铁素体回复与再结晶.由于初始条件下碳的分布在微观尺度下相对均匀,变形后获得细小等轴铁素体与均匀分布颗粒状渗碳体的组织.
The microstructure evolution of medium carbon steel during the deformation process includes ferrite dynamic recovery, recrystallization and precipitation spheroidization of cementite, etc. The initial microstructure of carbon steel was studied by means of Gleeble1500 thermal simulation machine, Medium carbon steel in the temperature deformation of the above complex process.The results show that: the initial organization of pearlite + pro-eutectoid ferrite samples in the temperature deformation of cementite ply kink, dissolve gradually to the ball In the process of ferrite recrystallization recrystallization accompanied by fine dispersed cementite particles precipitated from the supersaturated ferrite to obtain micron-sized ferrite grains and granular cementite dispersed complex phase But the equiaxed ferrite grains and dispersed cementite particles are unevenly distributed along the deformation direction.Temperature deformation can promote the precipitation of cementite in the medium carbon steel with initial martensite and ferrite Body recovery and recrystallization, the carbon distribution is relatively uniform at the microscopic scale under initial conditions, and the microstructure of fine equiaxed ferrite and uniformly distributed granular cementite is obtained after deformation.