摘要
使用 Ｇｌｅｅｂｌｅ—１５００型热模拟机，对 ３０ＣｒＭｎＳｉＭｏＶ超高强度钢在奥氏体状态下预应变，而后分三种工艺淬火：预应变结束后不卸载立即喷雾冷却；预应变结束后卸载，并于９６０℃保温５ ｍｉｎ后再喷雾冷却；预应变后不卸载，重新加热至１０５０℃，并保温５ ｍｉｎ；发生再结晶后再喷雾冷却．经对其马氏体组织进行分析发现：处于释放状态的弹性应变能会促发马氏体相变均匀形核；而塑性应变对马氏体的生长有限制作用，可间接影响马氏体的相变形核，两者的恰当配合，可显著细化马氏体，使其板条平均宽度接近纳米量级水平（平均宽度为 １２０ ｎｍ）．在此基础上，提出了一种马氏体相变的软模弹性波动形核机制，可解释所获得的实验结果．
Using Geeble-1500 thermal analogue test machine, the ultra-strength steel 30CrMn-SiMoV was prestrained in the austensite state at non-dynamic recrystallization temperature (960 degreesC), and then quenched by three processes: the first, the sample was spray quenched immediately under loaded condition; the second, the unloaded sample kept at 960 degreesC for 5 min and then was spray quenched; the last, the loaded sample was reheated to 1050 degreesC and kept for 5 min to take place recrystallization, then was spray quenched. The results show that the elastic strain energy kept in the sample stimulates homogeneous nucleation of martensite while the plastic strain restricts the growth of martensite. If the elastic strain and the plastic strain are matched appropriately, the lath of martensite can be distinctively refined to nanometer scale with an average width of 120 nm. The soft mode fluctuation nucleation mechanism of martensitic transformation can be used to explain the observed results.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第8期791-794,共4页
Acta Metallurgica Sinica
关键词
马氏体相变
相变形核
预应变淬火
波动形核
马氏体钢
martensitic transformation
transformation nucleation
prestrained quenching
fluctuation nucleation
