铝对超高锰Fe-24Mn-1.0C铸钢的组织和性能的影响
发布时间：2018-10-13 16:57
【摘要】：以超高锰Fe-24Mn-1.0C(无铝)和Fe-24Mn-7.1Al-1.0C(含铝)铸钢为研究对象,采用水韧处理、水韧处理+时效处理的热处理方法,研究铝对不同热处理条件下无铝和含7.1%Al铸钢组织和性能的影响。利用光学显微镜和扫描电镜观察显微组织,利用能谱分析和透射电镜测试观察析出物的成分、形貌;性能检测包括抗拉强度、屈服强度、冲击韧性(V型缺口)、断后延伸率、初始硬度。结果表明,铝的添加提高了铸钢Fe-24Mn-1.0C的层错能(γSFE),但却降低了其抗拉强度、冲击韧性和加工硬化速率。在时效过程中,铸钢Fe-24Mn-1.0C晶界处析出大量针状粗大的碳化物,恶化了其性能(500℃时效2h)。而铝元素增加了奥氏体基体中碳的稳定性,抑制了粗大针状碳化物的析出,析出纳米级的(Fe,Mn)3AlC的κ-碳化物,明显提高了基体的硬度和强度。铸钢Fe-24Mn-7.1Al-1.0C经550℃时效2h后综合力学性能达到最佳值,与常规水韧处理相比屈服强度提高到574MPa(提高40.0%,)抗拉强度为825 MPa,硬度提高到271HB(提高32.2%),断后延伸率为32.0%,冲击韧性为156J/cm2。
[Abstract]:The effects of aluminum on the microstructure and properties of Al-free and 7.1%Al cast steel under different heat treatment conditions were studied by using the heat treatment method of water toughening and water toughening aging, taking ultra-high manganese Fe-24Mn-1.0C and Fe-24Mn-7.1Al-1.0C cast steel as research objects. The microstructure was observed by optical microscope and scanning electron microscope, the composition and morphology of the precipitates were observed by energy dispersive analysis and transmission electron microscopy, and the tensile strength, yield strength, impact toughness (V-shaped notch), elongation after break were examined. Initial hardness. The results show that the addition of aluminum increases the stacking fault energy (纬 SFE),) of cast steel Fe-24Mn-1.0C, but decreases its tensile strength, impact toughness and work hardening rate. During the aging process, a large number of coarse needle-like carbides were precipitated at the grain boundary of cast steel Fe-24Mn-1.0C, which deteriorated the properties of the cast steel (aged at 500 鈩，
本文编号：2269314
[Abstract]:The effects of aluminum on the microstructure and properties of Al-free and 7.1%Al cast steel under different heat treatment conditions were studied by using the heat treatment method of water toughening and water toughening aging, taking ultra-high manganese Fe-24Mn-1.0C and Fe-24Mn-7.1Al-1.0C cast steel as research objects. The microstructure was observed by optical microscope and scanning electron microscope, the composition and morphology of the precipitates were observed by energy dispersive analysis and transmission electron microscopy, and the tensile strength, yield strength, impact toughness (V-shaped notch), elongation after break were examined. Initial hardness. The results show that the addition of aluminum increases the stacking fault energy (纬 SFE),) of cast steel Fe-24Mn-1.0C, but decreases its tensile strength, impact toughness and work hardening rate. During the aging process, a large number of coarse needle-like carbides were precipitated at the grain boundary of cast steel Fe-24Mn-1.0C, which deteriorated the properties of the cast steel (aged at 500 鈩，
本文编号：2269314
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