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利用连续退火模拟试验机对两种含Nb中锰钢进行Q&P热处理试验,通过SEM、EBSD、拉伸试验及X射线衍射法研究了不同淬火温度对含Nb中锰Q&P钢组织性能的影响。结果表明:淬火温度通过影响初生马氏体量进而影响最终室温奥氏体含量,其中对5Mn钢的影响低于7Mn钢。当淬火温度为180℃时,5Mn-Nb钢获得的最大抗拉强度可达1041 MPa,伸长率为34.9%,强塑积可达36 000 MPa·%;7Mn-Nb钢在淬火温度为60℃的Q&P工艺处理下获得的最大抗拉强度可达1245 MPa,伸长率为32.4%,强塑积可达40 338 MPa·%。
The effects of different quenching temperatures on the microstructure and properties of Nb and Mn-containing Q & P steels were studied by SEM, EBSD, tensile test and X-ray diffraction. The results show that the quenching temperature affects the final room temperature austenite content by affecting the amount of primary martensite. The effect on the 5Mn steel is lower than that of 7Mn steel. When the quenching temperature is 180 ℃, the maximum tensile strength of 5Mn-Nb steel is up to 1041 MPa, the elongation is 34.9% and the strong plastic product is up to 36 000 MPa ·%. The quenching temperature of 7Mn-Nb steel is 60 ℃ Q & P process to obtain the maximum tensile strength of up to 1245 MPa, elongation of 32.4%, a strong plastic product up to 40 338 MPa ·%.