CAJ | 학술논문

为了探究瞬时淬火工艺下低碳钢组织的演变规律，在热模拟机上对 Q195和 CR340试样进行了瞬时淬火处理。结果表明，瞬时淬火工艺初期得到马氏体+贝氏体+铁素体+未溶渗碳体的复杂混合组织；保温足够时间后，未溶渗碳体逐渐溶解使奥氏体平均碳浓度升高，奥氏体晶粒内碳浓度梯度减小，从而增加组织中马氏体相对量，最终得到全部板条马氏体组织。瞬时淬火工艺与传统淬火工艺相比可明显细化试验钢晶粒尺寸，提高升温速率对试验钢晶粒细化作用更明显。
위료탐구순시쉬화공예하저탄강조직적연변규률，재열모의궤상대 Q195화 CR340시양진행료순시쉬화처리。결과표명，순시쉬화공예초기득도마씨체+패씨체+철소체+미용삼탄체적복잡혼합조직；보온족구시간후，미용삼탄체축점용해사오씨체평균탄농도승고，오씨체정립내탄농도제도감소，종이증가조직중마씨체상대량，최종득도전부판조마씨체조직。순시쉬화공예여전통쉬화공예상비가명현세화시험강정립척촌，제고승온속솔대시험강정립세화작용경명현。
The mechanism of microstructure evolution of loW carbon steels Q195 and CR340 during flash processing Was studied by utilizing hot simulation device.The results indicated that complex microstructure consisting of martensite,bainite,ferrite and undissolved cementite Was observed in the early stage of flash processing.The average concentration of carbon increases oWing to the gradual dissolution of undissolved cementite,leading to the decrease of carbon concentration in austenite grain.Finally,the relative amount of martensite increases,and the microstructure is Wholly comprised of lath martensite.Comparing With the traditional quenching process, flash processing can significantly refine grain size of experimental steels. Simultaneously,the role of grain refinement Will become more obvious by increasing heating rate.