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利用热模拟试验机Gleeble-3500研究了10Mn5中锰钢在450~650℃变形的应力应变曲线特性,并观察了变形后的组织。结果表明:钢在450℃变形时的峰值应力达到900 MPa,马氏体板条形态清晰可见;随着变形温度的升高,峰值应力急剧降低,组织中马氏体板条边界逐渐变得模糊。另外,在变形过程中,大量细小碳化物析出,且主要集中于板条边界和板条内部。当变形温度增加650℃时,钢的峰值应力降低到370 MPa,马氏体板条形貌基本消失,组织部分奥氏体化。
The stress-strain curve of 10Mn5 manganese steel was studied by means of a thermal simulator Gleeble-3500 at 450-650 ℃, and the deformed structure was observed. The results show that the peak stress of steel is 900 MPa when the steel is deformed at 450 ℃ and the martensite lath is clearly visible. With the increase of deformation temperature, the peak stress decreases sharply and the boundaries of martensite lath in the structure gradually become blurred . In addition, a large amount of fine carbides are precipitated during deformation and are mainly concentrated at slat boundaries and slats. When the deformation temperature is increased by 650 ℃, the peak stress of steel decreases to 370 MPa, martensite lath morphology disappears, and the microstructure is partly austenitized.