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研究了Ｃｒ１２Ｍｎ５Ｎｉ４Ｍｏ３Ａｌ沉淀硬化不锈钢弹簧低周疲劳性能和疲劳断口，指出在５２０℃时效时，由δ铁素体析出的大片状Ｊ相和α＇相诱发疲劳裂纹是降低疲劳寿命的主要因素；在３００℃时效处理可大幅度提高疲劳寿命。
The low cycle fatigue behavior and fatigue fracture of Cr12Mn5Ni4Mo3Al precipitation-hardened stainless steel spring were studied. It is pointed out that the fatigue crack induced by large-scale J phase and α ’phase precipitated by δ-ferrite is the main factor to reduce the fatigue life at 520 ℃ aging. 300 ℃ aging treatment can greatly improve the fatigue life.