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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Kinetics of transformation of delta ferrite during creep in a type 316(N) stainless steel weld metal
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Kinetics of transformation of delta ferrite during creep in a type 316(N) stainless steel weld metal

机译：316（N）型不锈钢焊接金属蠕变过程中δ铁素体转变的动力学

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摘要

A quantitative study on the transformation behaviour of delta ferrite in a type 316(N) stainless steel weld metal during creep in the temperature range 823-923 K was carried out. The fraction of 6 ferrite transformed was determined from magne-gage measurements on the samples after creep fracture at various stress levels, i.e. after different durations of creep exposure. The transformation was found to follow the Avrami kinetics, X velence 1 - exp(-bt~n) where X is the fraction of delta ferrite transformed, t is the time to rupture and b and n are constants. n was found to be independent of temperature. An apparent activation energy for transformation, Q, was determined from the temperature dependence of the constant b expressed as b_0 exp(- Q/RT) as about 152 kJ mol~(-1) which is similar to that for Mo diffusion and for boundary diffusion in 316 SS. X-ray diffraction analysis of the precipitates extracted from the creep tested samples indicated the presence of Mo-rich phases eta and chi. It is proposed that the transformation is controlled initially by diffusion of Cr through delta/gamma boundaries to form carbides, followed by matrix diffusion of Mo to form the intermetallic phases.
机译：对在823-923 K温度范围内蠕变期间316（N）型不锈钢焊接金属中δ铁素体的转变行为进行了定量研究。根据在不同应力水平下蠕变断裂后，即在不同的蠕变暴露时间后，对样品进行的磁栅测量，确定了6个铁素体转变的分数。发现该转变遵循Avrami动力学，X velence 1 -exp（-bt_n）其中X是δ铁素体转变的分数，t是破裂时间，b和n是常数。发现n与温度无关。由常数b的温度依赖性（表示为b_0 exp（-Q / RT））约为152 kJ mol〜（-1）来确定转化的表观活化能Q，这与Mo扩散和边界的相似。在316 SS中扩散。从蠕变测试样品中提取的沉淀物的X射线衍射分析表明，富Mo相eta和chi的存在。建议通过首先通过Cr通过δ/γ边界扩散形成碳化物，然后通过Mo的基体扩散形成金属间相来控制转变。

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