30MnCr22鋼奧氏體連續(xù)冷卻轉(zhuǎn)變曲線的測試研究

Test Study on Austenite Continual Cooling Transformation Curve of 30MnCr22 Steel

摘要: 在Gleeble-1500D熱模擬機(jī)上利用熱膨脹-金相法測定了30MnCr22鋼在不同冷卻速度下連續(xù)冷卻轉(zhuǎn)變的膨脹曲線,獲得了30MnCr22鋼的連續(xù)冷卻轉(zhuǎn)變曲線(CCT曲線),并利用ZEISS顯微鏡觀察了不同冷卻速度下試樣的金相組織,借助LEICA顯微硬度計(jì)測量了各個試樣的顯微硬度值。通過對CCT曲線的分析為30Mn-Cr22鋼石油套管熱處理工藝的制定提供了理論依據(jù)。

Abstract: With the thermal expansion-metallograph method and the Gleeble-1500D thermal simulator,the 30MnCr22 steel's expansion curve of continual cooling transformation under different cooling velocities is measured,having resulted in the continual cooling transformation curve(CCT curve) of the steel.Also conducted is observation of the metallographic structures of the specimens under different cooling velocities via a ZEISS microscope.And the micro-hardness value of each specimen is measured with a LEICA micro-hardometer.The result of analysis of the CCT curve can be sued as the theoretic basis for establishing heat treatment process for the 30MnCr22 oil casings.