板条、块状组织及原始奥氏体晶粒（PAG）尺寸对新型马氏体时效钢拉伸、蠕变及疲劳性能的影响
The Influence of Lath, Block and Prior Austenite Grain (PAG) Size on the Tensile, Creep and Fatigue Properties of Novel Maraging Steel.
作者信息
Simm Thomas, Sun Lin, McAdam Steven, Hill Paul, Rawson Martin, Perkins Karen
机构信息
College of Engineering, Swansea University, Swansea SA1 8EN, UK.
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK.
出版信息
Materials (Basel). 2017 Jun 30;10(7):730. doi: 10.3390/ma10070730.
The influence of martensitic microstructure and prior austenite grain (PAG) size on the mechanical properties of novel maraging steel was studied. This was achieved by looking at two different martensitic structures with PAG sizes of approximately 40 µm and 80 µm, produced by hot rolling to different reductions. Two ageing heat-treatments were considered: both heat-treatments consisted of austenisation at 960 °C, then aging at 560 °C for 5 h, but while one was rapidly cooled the other was slow cooled and then extended aged at 480 °C for 64 h. It is shown that for the shorter ageing treatment the smaller PAG size resulted in significant improvements in strength (increase of more than 150 MPa), ductility (four times increase), creep life (almost four times increase in creep life) and fatigue life (almost doubled). Whereas, the extended aged sample showed similar changes in the fatigue life, elongation and hardness it displayed yet showed no difference in tensile strength and creep. These results display the complexity of microstructural contributions to mechanical properties in maraging steels.
研究了马氏体微观结构和原始奥氏体晶粒（PAG）尺寸对新型马氏体时效钢力学性能的影响。通过观察两种不同的马氏体组织来实现这一目的，这两种组织的PAG尺寸约为40 µm和80 µm，通过热轧至不同的压下量获得。考虑了两种时效热处理：两种热处理均包括在960 °C奥氏体化，然后在560 °C时效5 h，但一种是快速冷却，另一种是缓慢冷却，然后在480 °C延长时效64 h。结果表明，对于较短的时效处理，较小的PAG尺寸导致强度显著提高（增加超过150 MPa）、延展性（增加四倍）、蠕变寿命（蠕变寿命几乎增加四倍）和疲劳寿命（几乎翻倍）。然而，延长时效的样品在疲劳寿命、伸长率和硬度方面表现出类似的变化，但在抗拉强度和蠕变方面没有差异。这些结果显示了马氏体时效钢中微观结构对力学性能贡献的复杂性。
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