The effect of volume fractions of phases on the strain and stress partitioning behavior in a duplex stainless steel

To change the volume fraction of each phase can affect the mechanical properties of a multiphase material. The stress and strain partitioning can be different by changing the volume fraction of each phase. This may further influence the work hardening behavior of each phase to optimize the mechanical properties of the samples. In order to study the effect of volume fractions on the strain and stress partitioning in a duplex stainless steel, we are proposing to perform in-situ neutron diffraction measurements on five tailored samples with different volume fractions of phases. By studying this we can clarify the mechanism of the effect of phases volume fractions on strain and stress partitioning behavior. This may provide a reference when designing a new material with a good combination of strength and ductility.

改变各相的体积分数，可对多相材料的力学性能产生影响。改变各相体积分数可使各相间的应变与应力分配（strain and stress partitioning）行为产生差异，进而影响各相的加工硬化（work hardening）行为，以优化试样的力学性能。为探究双相不锈钢（duplex stainless steel）内体积分数对应变与应力分配行为的影响，本研究拟对5种不同相体积分数的定制试样开展原位中子衍射（in-situ neutron diffraction）测试。通过该研究可阐明相体积分数对应变与应力分配行为的影响机制，其研究成果可为设计兼具强度与塑性良好匹配的新型材料提供参考依据。