Deformation effects on intragranular carbide precipitation and transgranular chromium depletion in type 316 stainless steels
Deformation effects on intragranular carbide precipitation and transgranular chromium depletion in type 316 stainless steels
复制标题
变形对 316 型不锈钢晶内碳化物析出和穿晶贫铬的影响
DOI：
10.5006/1.3585206
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发表时间：
1991
期刊：
影响因子：
1.6
通讯作者：
S. Bruemmer
中科院分区：
文献类型：
--
作者：
A. Advani;L. Murr;D. Atteridge;R. Chelakara;S. Bruemmer
摘要已观察到316型不锈钢（SS）中的晶粒基质或穿晶（TG）铬耗尽与应变和热处理相关，在时间-温度-应变-TG腐蚀图上产生C曲线行为。应变效应在16%至20%以上占主导地位，表明随着应变水平的增加，TG腐蚀增加，TG耗尽的时间减少。较高的温度也减少了时间，以发展晶粒基体攻击，而等温保持较长的时间产生较高的TG腐蚀SS量。穿晶贫化是由碳化物在晶粒基体区域内的沉淀引起的。具体而言，应变过程中产生的缺陷部位是SS中晶内沉淀的有利位置。高位错密度，变形孪晶堆垛层错平面和双故障交叉点的区域被确定为在透射电子显微镜（TEM）的16%至35%变形SS的晶粒基体沉淀的首选网站。
Abstract Grain matrix or transgranular (TG) chromium depletion in type 316 stainless steels (SS) has been observed to be strain and heat treatment dependent, yielding C-curve behavior on a time-temperature-strain-TG corrosion map. The strain effect dominates above 16 to 20 percent showing increased TG corrosion and decreased time to develop TG depletion with increasing strain level. Higher temperatures also reduce the time to develop grain matrix attack, while isothermal holding for longer times produces higher amounts of TG corrosion in SS. Transgranular depletion is caused by precipitation of carbides within grain-matrix regions. Specifically, defect sites created during straining are favored locations for intragranular precipitation in SS. Regions of high dislocation density, deformation twin-stacking fault planes and twin-fault intersections were identified to be preferred sites for grain matrix precipitation during transmission electron microscopy (TEM) of 16 to 35 percent deformed SS.