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首页> 外文期刊>ISIJ international >In situ Neutron Diffraction Study on Ferrite and Pearlite Transformations for a 1.5Mn-1.5Si-0.2C Steel
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In situ Neutron Diffraction Study on Ferrite and Pearlite Transformations for a 1.5Mn-1.5Si-0.2C Steel

机译：对1.5Mn-1.5Si-0.2C钢的铁素体和珠光体相变的原位中子衍射研究

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摘要

The phase transformation behavior from austenite upon cooling in a 1.5Mn-1.5Si-0.2C steel was in situ monitored using dilatometry, X-ray and neutron diffractions. The starting temperature of ferrite transformation was in good agreement between dilatometry and neutron diffraction, whereas much higher in X-ray diffraction. Such a discrepancy in transformation temperature is attributed to the change in chemical composition near the surface of a specimen heated to elevated temperatures in a helium gas atmosphere for X-ray diffraction. In situ neutron diffraction enables us to investigate the changes in lattice constants of ferrite and austenite, which are affected by not only thermal contraction but also transformation strains, thermal misfit strains and carbon enrichment in austenite. Pearlite transformation started after carbon enrichment in austenite reached approximately 0.7 mass% and contributed to diffraction line broadening.
机译：使用膨胀计，X射线和中子衍射原位监测在1.5Mn-1.5Si-0.2C钢中冷却时奥氏体的相变行为。铁素体转变的起始温度在膨胀法和中子衍射之间有很好的一致性，而在X射线衍射中则要高得多。转变温度的这种差异归因于在氦气气氛中加热到高温进行X射线衍射的样品表面附近化学成分的变化。原位中子衍射使我们能够研究铁素体和奥氏体的晶格常数的变化，不仅受热收缩，而且还受奥氏体中的转变应变，热失配应变和碳富集的影响。在奥氏体中的碳富集达到约0.7质量％之后，珠光体转变开始，并且有助于衍射线变宽。

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