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1)  σ-phase
σ-相
1.
δ-Ferrite mainly transforms into secondary austenite and σ-phase.
δ-铁素体转变成第二项奥氏体和σ-相
2)  σ phase
σ相
1.
The results show that the austenite matrix is strengthened by the plentiful precipitation of small intersectant σ phase with high hardness during aging treatment.
研究了时效处理对σ相强化奥氏体不锈钢组织和腐蚀磨损特性的影响。
2.
The formation of σ phase due to aging tre.
31 0不锈钢于 70 0℃ ,1 0 0 0 0h时效后在晶界大量析出σ相 ,使晶界附近贫Cr,降低了其抗硫腐蚀性
3.
It is shown that the dense cracks in magnesium reduction jar made of ZG40Cr28Ni16 are caused by the segregation of σ phase.
介绍一种炼镁还原罐的专利结构 ,简介炼镁还原罐的工作环境和常用材质 ,指出ZG40Cr2 8Ni16材质炼镁还原罐产生密集性裂纹的原因是σ相的析出 ,进而提出一种新的炼镁还原罐结构。
3)  sigma phase
σ相
1.
The delta phase precipitation at the grain boundaries is noticeably suppressed due to the increasing Al addition,and some harmful phases including Laves phase,M_7C_3 carbide and sigma phase are formed intergranularly.
结果表明,提高Al含量可抑制晶界δ相的析出,促进晶界Laves相、M_7C_3相和σ相等有害相的析出;随着Al含量的提高,GH4169合金的室温冲击性能明显降低,冲击断口由穿晶型转变为沿晶型。
2.
The CCT curve of 00Cr25Ni7Mo4N super duplex stainless steel was obtained by thermal dilatometry,and the influence of cooling rate on precipitated sigma phase was studied by combining with metallographic observation,micro hardness measurement and XRD.
结果表明,00Cr25Ni7Mo4N双相不锈钢热处理或热加工温度应控制在1 050℃以上;冷却速率越小,σ相析出量越多,显微硬度也越高;钢在冷却过程中要以大于4 800℃/h的冷却速率通过600~1 000℃区域,从而避免σ脆性相的析出。
4)  σphase
σ相
1.
The results show that abundantσphase precipitated in the welded joint was the main reason for this accident.
结果表明:开裂烟机管线的焊接接头析出了大量的σ相是导致管线开裂的主要原因;基体、热影响区、熔合区的σ相含量分别为17。
2.
But subjected to"aging"treatments at temperatures of 600 to 1000℃,duplex stainless steels will precipitate a certain amount of intermetallic phases such asσphase,χphase and chromium nitride,etc.
结果表明,固溶后经时效处理,金属间相在铁素体内和铁素体/奥氏体晶界析出;650℃时效时,析出的金属间相主要是χ相;750℃时效时析出σ相和χ相,此时σ相由χ相演变而来;850℃时效下则直接析出σ相;950℃时效后,少量的σ相仅在铁素体/奥氏体晶界产生。
5)  σ-phase embrittlement
σ相脆化
6)  σ phase strengthening
σ相强化
补充资料:σ-orbital
分子式:
CAS号:

性质:相对于分子中键轴呈圆柱形对称的分子轨道称为σ轨道,相应的化学键为σ键,占据σ轨道的电子为σ电子(σ-electron)。而存在一个通过分子轴的对称节面的分子轨道称为π轨道(π-orbital),相应的化学键称为π键,占据π轨道的电子为π电子(x-electron)。类似地,具有两个通过分子轴的对称节面的分子轨道称为δ轨道,相应有δ键和δ。 

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