In-situ neutron diffraction study on work-hardening behavior in a ferrite-martensite dual phase steel
In-situ neutron diffraction study on work-hardening behavior in a ferrite-martensite dual phase steel
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DOI：
10.20485/jsaeijae.2.4_131
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发表时间：
2011-05
影响因子：
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通讯作者：
S. Morooka;Naoko Sato;M. Ojima;S. Harjo;Y. Adachi;Y. Tomota;O. Umezawa
中科院分区：
文献类型：
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作者：
S. Morooka;Naoko Sato;M. Ojima;S. Harjo;Y. Adachi;Y. Tomota;O. Umezawa
从非均匀变形的观点讨论了钢的强度和加工硬化。原位中子衍射研究表明，晶粒之间的失配应变伴随着晶粒尺度的内应力（晶间应力）。在双相钢中，晶间应力叠加在相应力上。这些结果表明，一个简单的双相材料模型的预测很好的协议：强马氏体相产生更高的应力比宏观屈服应力，导致（铁素体+马氏体）双相钢的高强度。长程内应力和短程内应力（如森林位错硬化）都可能对钢中的位错运动产生阻力。因此，较高的内应力和较大的体积分数更有效地发生加工硬化。
Strength and work-hardening in steels are discussed from the viewpoint of heterogeneous deformation. In-situ neutron diffraction studies made it clear that misfit strains between grains accompanied grain-scaled internal stresses (intergranular stress). In a dual phase steel, the intergranular stress was superposed on the phase stress. These results show good agreement with the predictions of a simple dual-phase material model: the strong martensite phase yields higher stress than the macro-yield stress, resulting in high strengthening of (ferrite + martensite) dual phase steels. Both long-range internal stress and short-range ones such as forest dislocation hardening may cause resistance to dislocation motion in the steels. Therefore, work-hardening takes place more effectively with higher internal stress and larger volume fraction.