【摘要】 采用膨胀试验和淬火试验研究了ASTM A216 WCA钢奥氏体化过程中的组织演变,分析了不同加热速率对奥氏体化过程的影响,并通过金相分析方法研究了加热过程中各相相分数的变化。结果表明,随着加热速率的增大,奥氏体化转变开始温度和结束温度均升高,初始奥氏体晶粒尺寸减小;同时可以看出,奥氏体化过程中珠光体向奥氏体的转变速度比铁素体向奥氏体的转变速度快。更多还原

【Abstract】 The microstructure evolution of ASTM A216 WCA steel during austenitization process was investigated by means of dilatometric and quenching experiments.The effect of heating rate on austenitizing was analyzed,and the variations of austenite and ferrite fractions during heating process were studied by metallographic observation.The results show that the start and finish temperatures of austenite transformation increase with the increase of the heating rate,while the initial austenite grain reduces with the increase of the heating rate.Meanwhile,it is find that the transformation rate of pearlite into austenite is faster than that of ferrite into austenite during austenitizing.更多还原