摘要
采用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)方法及力学性能测试等研究手段,研究了敏化处理对2205双相不锈钢显微组织及力学性能的影响。结果表明:850℃敏化处理,在α/γ和α/α相界析出σ,χ相,并且随着敏化时间的延长,析出相含量增加;敏化处理后材料的强度有所提高,塑性明显降低,拉伸微观断口以解理平面为主要特征,并且随着敏化时间的延长出现了二次裂纹;材料的室温冲击功由固溶处理的290J以上降至敏化处理2h后的10J以下,冲击微观断口由韧窝转变为解理;析出相的存在是导致材料冲击韧性下降的主要原因。
The effect of sensitizing treatment on the microstructure and the mechanical properties of 2205 duplex stainless steel was studied by means of optical microscopy（OM）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and mechanical property testing.The results show that the σ phase and the χ phase are precipitated at the boundaries ferrite/austenite and ferrite/ferrite under sensitizing treatment at 850℃,and the precipitated phase content increases with increasing of sensitizing treatment time.Sensitizing treatment leads the increase of the strength and dramatic decrease of the plasticity.The tensile fracture surfaces are characteristic of cleavage and facet,and the second cracking exists on the main fracture surface as the sensitizing treatment time increases.When sensitizing treatment time is 2h,the impact toughness of the samples at room temperature decreases from 290J to 10J.The impact fracture surfaces are changed from dimple to cleavage.The decrease of the impact toughness can be attributed to appearance of the precipitated phase.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2011年第5期76-80,共5页
Journal of Materials Engineering
关键词
2205双相不锈钢
敏化处理
析出相
力学性能
2205 duplex stainless steel
sensitizing treatment
precipitated phase
mechanical property
