时效温度对沉淀硬化不锈钢FV520(B)组织及低温力学性能的影响
Effects of Aging Temperature on Microstructure and Low Temperature Mechanical Properties of FV520(B) Steel
张 敏, 黄晓江, 李继红, 赵宾灵
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作者单位：(西安理工大学 材料科学与工程学院, 陕西 西安 710048)
中文关键字：沉淀硬化；时效处理；微观组织；力学性能
英文关键字：precipitation-hardening; aging treatment; microstructure; mechanical property
中文摘要：采用扫描电镜、 X射线衍射、金相试验和低温力学性能试验等方法，研究了时效温度对沉淀硬化不锈钢FV520(B)的组织和低温力学性能的影响。结果表明：在470 ℃时效，硬度出现峰值，主要与组织中细小的富铜相共格析出有关；随时效温度的升高，600 ℃时效时，冲击韧度最佳，此时残余奥氏体量最多；470 ℃及560 ℃时效时的冲击断口扩展区断口以准解理形貌为主，而其他时效状态下为韧窝形貌，但韧窝细节各不相同。
英文摘要：The effects of aging temperature on microstructure and low temperature mechanical properties of precipitation-hardening stainless steel FV520(B) were studied by SEM, XRD and low temperature tensile test. The results show that the hardness reaches a peak value aging at 470 ℃ due to fine copper-rich phase precipitating. With aging temperature increasing, the residual austenite quantitation and impact ductility all reach the highest level at 600℃. However, the fracture appearance of the impact specimens, aged at 470 ℃ and 560 ℃, is mainly quasi-cleavage fracture, while those of the specimens aged at other temperatures are dimples. The dimples cleavage and mixed fracture has differences surface topography in detail.