10CrMo910钢老化过程中的巴克豪森效应

基于Larson-Miller参数对10CrMo910钢进行了不同时段的高温加速老化模拟实验,运用光学显微镜(OM)和透射电子显微镜(TEM)对试样进行了显微组织观察,并研究了显微组织变化和不同老化程度对巴克豪森噪声(BN)的影响.结果表明,随高温加速老化时间的增加,老化过程中的主要组织结构变化为珠光体的消散与分解,碳化物自基体中析出与长大并向晶界迁移,晶粒亦有所长大,与此同时,位错密度则显著下降.与之对应的巴克豪森噪声检测结果显示,随着老化程度的增加,其BN振铃计数率呈逐渐降低趋势,作者从磁畴结构的角度并结合显微组织的变化对此进行了详细的分析并指出,老化过程中磁畴壁数目的减少是其最为主要的原因.

Barkhausen noise response on aging process of 10CrMo910 steel

The simulation of high temperature aging of 10CrMo910 steel was performed based on Larson-Miller parameter for different time intervals. The effects of change in microstructure and different aging degrees on Barkhausen noise (BN) was studied. Results of OM and TEM showed that the main microstructure variation during aging process were the dissipation of pearlite; the precipitation of carbide from the matrix, carbide growth and transition from intracrystalline to grain boundaries and grain growth .Meanwhile, dislocation density drops obviously .Accordingly the research of Barkhausen noise showed that the ringdown count rate of BN tend to decrease gradually by the aging degree increasing of 10CrMo910 steel. The test results were analyzed and discussed at the angle of microstructure and domain structure. The reduced amount of domain wall during aging process was regarded as main reason.