Effect of injection temperature, 5% pre-strain and long time aging on the high-temperature mechanical properties of helium injected 316 stainless steel
Effect of injection temperature, 5% pre-strain and long time aging on the high-temperature mechanical properties of helium injected 316 stainless steel
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效果%20of%20injection%20温度、%205%%20预应变%20and%20long%20time%20aging%20on%20%20高温%20机械%20属性%20of%20氦%20injected%20316%20不锈钢%20钢
DOI：
10.1016/0022-3115(81)90477-3
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发表时间：
1981
影响因子：
3.1
通讯作者：
T. Shikata
中科院分区：
文献类型：
--
作者：
H. Shinno;H. Shiraishi;R. Watanabe;H. Kamitsubo;I. Kohno;T. Shikata
在573 ± 50和1073 ± 20 K温度下，用拉伸试验测定了316不锈钢在3 ~ 10 ppm氦浓度下的氦脆化。在1123 K下再注射1000 h或在1023 K下再注射3000 h后，这种改善的效果丧失。从TEM观察得出的结论是，在溶液处理的材料中，氦气泡集中在晶界上并引起脆化，但在5%预应变的材料中，氦气泡在位错上成核并生长得足够大，从而在拉伸试验期间不能被位错拖到晶界。长时间时效后的脆化是由于长时间热回复过程中位错攀移产生的扫出机制使大氦泡在σ相界聚集所致。
The helium embrittlement of 316 stainless steel, helium injected to concentrations of 3 ~ 10 at ppm at 573 ± 50 or 1073 ± 20 K, was measured by tensile tests at 1023 K and was completely suppressed by the 5% pre-straining. This improved effect was lost by a post-injection again of 1000 h at 1123 K or 3000 h at 1023 K. It was concluded from the TEM observations that in the solution treated material helium bubbles were concentrated on the grain boundaries and caused embrittlement, but in the 5% pre-strained material helium bubbles nucleated on the dislocations and grew large enough to be unable to be dragged to the grain boundaries by the dislocations during the tensile test. The embrittlement after the long time aging was due to the gathering of the large helium bubbles at the σ-phase boundaries by a sweepout mechanism due to dislocation climb during the long time thermal recovery process.