Stress state-dependent mechanics of additively manufactured 304L stainless steel: Part 1 – characterization and modeling of the effect of stress state and texture on microstructural evolution
Stress state-dependent mechanics of additively manufactured 304L stainless steel: Part 1 – characterization and modeling of the effect of stress state and texture on microstructural evolution
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DOI：
10.1016/j.msea.2018.11.094
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
Zhuqing Wang;A. Beese
中科院分区：
文献类型：
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作者：
Zhuqing Wang;A. Beese
研究了应力状态和晶体学织构对304L不锈钢增材制造构件应变诱发马氏体相变动力学的影响。进行了单轴拉伸、单轴压缩和纯剪切下的力学试验。实验结果表明，应变诱发马氏体相变速率随塑性应变的变化规律为：单轴压缩时最大，单轴拉伸时次之，纯剪切时最小。增材制造的SS304L在单轴压缩下的相变速率高于拉伸下的相变速率，这与在无纹理的常规加工奥氏体不锈钢中经常观察到的趋势相矛盾，但并非总是如此。首次研究了应力状态、晶体学织构和化学的综合影响，为增材制造的SS304L开发了一个新的应变诱导马氏体相变动力学方程，该方程捕获了作为塑性应变和这些因素的函数的微观结构演变。
The effect of stress state and crystallographic texture on strain-induced martensitic transformation kinetics in 304L stainless steel (SS304L) components made by additive manufacturing were investigated. Mechanical tests under uniaxial tension, uniaxial compression, and pure shear were performed. Experimental results showed that the rate of strain-induced martensitic phase transformation, with respect to plastic strain, was highest under uniaxial compression, followed by uniaxial tension, and lowest under pure shear. The higher rate of phase transformation under uniaxial compression than tension in the additively manufactured SS304L contradicts the trends often, but not always, observed in texture-free conventionally processed austenitic stainless steels. The combined effects of stress state, crystallographic texture, and chemistry were studied, for the first time, to develop a new strain-induced martensitic phase transformation kinetics equation for additively manufactured SS304L that captures the microstructural evolution as a function of plastic strain and these factors.