S32205双相不锈钢中σ相的析出及其对力学性能的影响
张威 李国平 张寿录
山西太钢不锈钢股份有限公司技术中心
σ phase precipitation and its effect on mechanical properties of S32205 duplex stainless steel
zhangwei zhang
摘要 利用彩色金相、扫描电镜、能谱仪、硬度和拉伸测试等手段研究了S32205双相不锈钢中σ相的析出规律及其对力学性能的影响。结果表明，时效15 min后σ相开始沿γ/α或α/α晶界析出，并向铁素体一侧长大，其析出反应为铁素体发生转变形成σ相和γ2相；随着时效时间延长，σ相的析出量增加，钢的硬度、强度逐渐提高，塑性显著降低，拉伸断口的断裂类型由典型的韧性断裂向以准解理断裂为特征的脆性断裂转变。
Abstract ：σ phase precipitation and its effect on mechanical properties of S32205 duplex stainless steel were analyzed by color-OM, SEM, EDS, hardness measurements and tensile tests in this paper. The results show that σ phase begins to nucleate at γ/α or α/α interfaces after 15 min aging, and then grows into the surrounding ferrite areas. The formation mechanism is a transformation of α into γ2 and σ. The amount of σ phase increases with prolonging aging time, which enhances obviously the hardness and strength of the steel, while, the formed σ phase decreases severely the ductility. The types of tensile fracture are changing from the typical ductile rupture to the brittle fracture characterized by quasi-cleavage crack.
收稿日期: 2009-11-06
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2010, Vol. 45 
