Influence of Temperature and Time of Austempering Treatment on Mechanical Properties of SAE 9254 Commercial Steel
Influence of Temperature and Time of Austempering Treatment on Mechanical Properties of SAE 9254 Commercial Steel
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等温淬火处理温度和时间对SAE 9254商品钢力学性能的影响
DOI：
10.1002/srin.201100174
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发表时间：
2012
影响因子：
2.2
通讯作者：
D. Santos
中科院分区：
文献类型：
--
作者：
J. A. Cruz;T. Rodrigues;V. –. Viana;H. Abreu;D. Santos
这项工作描述的步骤中的研究和开发的高含量的C，Si和Cr的商业钢与马氏体，贝氏体和残留奥氏体的纳米结构基体。将该钢的试样在900 °C下等温化5分钟，并在不同时间（0.5、2、24、48小时）和温度（200、220、270 °C）下等温热处理。不同条件下处理的试样，由于其微观结构的组成，观察到不同的力学行为。在200 °C下处理2小时的试样显示出较低的屈服强度，为979 MPa。另一方面，达到了2248 MPa的高拉伸强度。在270 °C下处理的样品在相同的处理时间下显示出更高的屈服强度，为1363MPa。对于断裂分析，对于在200 °C下处理的样品，脆性断裂机制占主导地位，而对于在270 °C下处理的样品，韧性断裂机制占主导地位。
This work describes the steps in the study and development of the high content of C, Si, and Cr in commercial steel with a nanostructured matrix of martensite, bainite and retained austenite. Specimens of this steel were austenitized at 900 °C for 5 min and isothermally heat treated at different times (0.5, 2, 24, 48 h) and temperatures (200, 220, 270 °C). Different mechanical behavior was observed for the samples treated under different conditions due to their microstructural constitution. Specimens treated for 2 h at 200 °C showed lower yield strength of 979 MPa. On the other hand a high tensile strength of 2248 MPa was reached. The sample treated at 270 °C showed higher yield strength of 1363 MPa with the same treatment time. As for the fracture analysis, the brittle fracture mechanism was predominant for the samples treated at 200 °C, while the ductile fracture mechanism was predominant for the samples treated at 270 °C.