|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Precipitation behavior and martensite lath coarsening during tempering of T/P92 ferritic heat-resistant steel显示文摘Tempering is an important process for T/P92 ferritic heat-resistant steel from the viewpoint of microstructure control,as it facilitates the formation of final tempered martensite under serving conditions.In this study,we have gained deeper insights on the mechanism underlying the microstructural evolution during tempering treatment,including the precipitation of carbides and the coarsening of martensite laths,as systematically analyzed by optical microscopy,transmission electron microscopy,and high-resolution transmission electron microscopy.The chemical composition of the precipitates was analyzed using energy dispersive X-ray spectroscopy.Results indicate the formation of M3C(cementite) precipitates under normalized conditions.However,they tend to dissolve within a short time of tempering,owing to their low thermal stability.This phenomenon was substantiated by X-ray diffraction analysis.Besides,we could observe the precipitation of fine carbonitrides(MX) along the dislocations.The mechanism of carbon diffusion controlled growth of M23C6 can be expressed by the Zener's equation.The movement of Y-junctions was determined to be the fundamental mechanism underlying the martensite lath coarsening process.Vickers hardness was estimated to determine their mechanical properties.Based on the comprehensive analysis of both the microstructural evolution and hardness variation,the process of tempering can be separated into three steps. | Lin-qing Xu Dan-tian Zhang Yong-chang Liu Bao-qun Ning Zhi-xia Qiao Ze-sheng Yan Hui-jun Li | 2014 | International Journal of Minerals,Metallurgy and Materials2014，21，5： | 5 |
| 2 | 55NiCrMoV7钢锭热加工过程的微观组织与力学性能显示文摘通过热加工试验(镦粗、拔长与热处理)结合扫描电子显微镜观察和力学性能测试,研究55NiCrMoV7钢锭的变形过程微观组织演化、断裂机制和力学性能变化。结果表明,随着镦拔变形量的增加,钢锭的铸态组织和缺陷可以逐步消除,材料的屈服强度、抗拉强度、伸长率和冲击韧性随着变形量增加而增加,断裂方式从铸态的完全脆性断裂逐渐过渡到脆性和韧性混合的断裂方式。调质热处理对马氏体形貌和碳化物的析出产生影响,进一步提高了材料的强度、塑性和韧性。 | 禹兴胜 武川 石如星 汪雨昌 | 2021 | 热加工工艺2021，50，15： | 1 |
| 3 | 糊状区渗氮对Cr10Mn9Ni0.7合金氮含量及凝固相变过程的影响显示文摘研究了糊状区保温对Cr10Mn9Ni0.7合金凝固过程和氮含量及相变过程的影响。结果表明,随着糊状区保温时间的延长,铸锭中的氮含量逐渐升高,同时铸锭中的气孔率逐渐降低。当氮气压力为0.1 MPa时,氮含量由0.17%升高到0.23%,而气孔率则从1.86%降至1.37%;当氮气压力为0.4 MPa时,氮含量由0.29%升高到0.37%,而气孔率从1.41%降至1.06%。糊状区保温的增氮机制可归结为:在糊状区保温会促进包晶反应进程,使更多的铁素体转变为奥氏体;同时糊状区保温能够提高残留液相中的氮含量,进而提高'通道状'奥氏体中的氮含量。糊状区保温能够消除铁素体阱,从而降低气孔率。 | 金青林 汪洋 曹磊 宋群玲 | 2018 | 材料导报2018，32，4： | 0 |
| 4 | 热处理对30Cr3MoV钢力学性能的影响显示文摘研究了热处理工艺参数对30Cr3MoV钢力学性能的影响规律。结果表明:30Cr3MoV钢在940~1180℃油冷淬火,开始时硬度逐渐增大,并在1060℃时达到最大值51.1 HR(,之后逐渐减小。试验钢在400~660℃空冷回火,开始时硬度稍有增大,并在500℃时达到最大值47.7 HRC,之后迅速减小。在940℃油冷淬火+600℃空冷回火的力学性能得到很大程度改善,相比H13芯棒钢,30Cr3MoV钢的屈服强度和抗拉强度分别提高261 MPa和198 MPa,冲击韧度提高9 J/cm^2,伸长率和断面收缩率相应提高4%和14%。 | 梁晓涛 王起江 单爱党 | 2015 | 热加工工艺2015，44，22： | 0 |
| 5 | 糊状区保温时间对201奥氏体不锈钢氮含量和气孔率的影响显示文摘对低镍奥氏体不锈钢201在糊状区分别在氮气环境中保温0、5、10、15 min,探究保温时间对氮含量和气孔率的影响。结果表明:随着保温时间的增长,氮含量显著提高。糊状区保温可在避开凝固过程中的铁素体区,促进液相中的氮向奥氏体扩散。经过热力学分析,化学势差提供了氮从液相向奥氏体扩散驱动力。因此,糊状区保温是一种有效的不锈钢增氮方法,为生产高氮不锈钢提供了新思路。 | 曹磊 金青林 | 2017 | 热加工工艺2017，46，6： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员