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首页> 外文期刊>Materials Science and Engineering >Effect of tempering upon the tensile properties of a nanostructured bainitic steel
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Effect of tempering upon the tensile properties of a nanostructured bainitic steel

机译：回火对纳米贝氏体钢拉伸性能的影响

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摘要

The tensile properties of a nanostructured carbide-free bainitic steel formed at 200-250 ℃ are compared against those after tempering sufficiently to remove the retained austenite. Although significant ductility is observed following tempering, a comparison of tempered and untempered samples shows that it is in fact reduced when a comparison is made at identical strength. The shape of the stress-strain curves shows clear evidence that the capacity for work hardening is reduced with the loss of austenite. The nanostructure of the steel transformed at 250 ℃ is examined by transmission electron microscopy, to compare the as-transformed to the tempered structure. In this case after tempering at 500 ℃ the energy absorbed during the tensile test is lower, due to the lower strength. Reduction of strength is caused by the slight coarsening of the bainite plates, and lower dislocation density after tempering. Considering the formation of carbide particles in high strength steel, impressive ductility is exhibited even in the tempered condition.
机译：将在200-250℃形成的不含纳米结构的无贝氏体钢的抗拉性能与充分回火以除去残留奥氏体后的抗拉性能进行了比较。尽管回火后观察到显着的延展性，但对回火和未回火样品的比较表明，当以相同强度进行比较时，实际上延展性降低了。应力-应变曲线的形状清楚地表明，随着奥氏体的损失，加工硬化的能力降低了。用透射电子显微镜检查了在250℃时转变的钢的纳米结构，以比较转变后的钢与回火的组织。在这种情况下，由于强度较低，在500℃回火后，在拉伸试验过程中吸收的能量较低。强度降低是由于贝氏体板略微变粗以及回火后较低的位错密度引起的。考虑到高强度钢中碳化物颗粒的形成，即使在回火条件下也表现出令人印象深刻的延展性。

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