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通过两道次压缩变形实验对含Nb微合金钢静态软化行为进行了研究。结果表明:含Nb微合金钢静态再结晶临界温度随应变量增大而降低;随原始奥氏体晶粒尺寸增加而升高。温度高于静态再结晶临界温度时,含Nb微合金钢的静态再结晶激活能为常数(170.589 kJ/mol);温度低于静态再结晶临界温度时,由于Nb的碳氮化物应变诱导析出,含Nb微合金钢的静态再结晶激活能为温度的函数,静态再结晶临界温度可通过再结晶激活能与温度倒数的关系曲线来确定。
The static softening behavior of Nb-containing microalloyed steel was studied by two-pass compression set test. The results show that the critical temperature of recrystallization of Nb microalloyed steel decreases with the increase of strain and increases with the increase of the grain size of the original austenite. When the temperature is higher than the critical temperature of static recrystallization, the static recrystallization activation energy of Nb microalloyed steel is constant (170.589 kJ / mol). When the temperature is lower than the critical recrystallization temperature, The static recrystallization activation energy of Nb-containing microalloyed steel is a function of temperature, and the critical temperature of static recrystallization can be determined by the curve of recrystallization activation energy and temperature reciprocal.