晶粒尺寸对贝氏体钢SDP1的连续冷却转变规律的影响

发布时间：2018-05-28 19:32

本文选题：预硬型塑料模具钢 + 晶粒尺寸　；参考：《材料导报》2017年06期

【摘要】：采用热膨胀仪测量了150μm和20μm大小两种晶粒尺寸的SDP1贝氏体钢的过冷奥氏体连续冷却转变(CCT)曲线,结合组织观察、硬度测试、热力学计算及动力学分析研究了晶粒尺寸对相变过程组织和硬度的影响。结果表明,小晶粒材料在低冷速相变过程中出现了片状珠光体,最低硬度为305HV,贝氏体转变对应冷速区间较小;大晶粒材料在各冷却条件下无珠光体产生,且贝氏体转变区较大,最低硬度为423HV。150μm和20μm晶粒材料的贝氏体相变激活能分别为124kJ·mol~(-1)和134kJ·mol~(-1)。
[Abstract]:The continuous cooling transformation curves of SDP1 bainite steel with grain sizes of 150 渭 m and 20 渭 m were measured by thermal expansion instrument. The effect of grain size on the microstructure and hardness of phase transformation was studied by thermodynamic calculation and kinetic analysis. The results show that the lamellar pearlite appears in the process of low cooling rate transformation, the lowest hardness is 305 HVV, the bainite transformation corresponds to a smaller cooling rate range, and the large grain material does not produce pearlite under various cooling conditions, and the bainite transformation zone is large. The activation energies of bainite transformation for the 423HV.150 渭 m and 20 渭 m grain materials are 124kJ molan-1 and 134kJ molanine 1, respectively, with the lowest hardness being 423HV.150 渭 m and 20 渭 m, respectively.
【作者单位】：省部共建高品质特殊钢冶金与制备国家重点实验室;上海市钢铁冶金新技术开发应用重点实验室;上海大学材料科学与工程学院;
【基金】：国家科技支撑计划课题(2007BAE51B04)
【分类号】：TG142.1

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