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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。
The effects of aging temperature on microstructure and mechanical properties of precipitation-hardened stainless steel FV520 (B) were investigated by scanning electron microscopy, X-ray diffraction, metallography and low temperature mechanical tests. The results show that the peak value of hardness appears at the aging of 470 ℃, which is mainly related to the coherent precipitation of fine copper-rich phase in the microstructure. With the increase of aging temperature, the impact toughness is the best when aging at 600 ℃. At this time, the residual austenite The fracture surfaces of the impact fracture extension zone at 470 ℃ and 560 ℃ aging are dominated by quasi-cleavage morphology, while the dimple morphology at other aging conditions, but the dimples vary.