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首页> 外文会议>5th International Conference on High Nitrogen Steels, 5th, May 27-28, 1998, Stockholm, Sweden >Effect of Nitrogen Content on Precipitation during Isothermal Annealing of P/M High Nitrogen Austenitic Stainless Steels
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Effect of Nitrogen Content on Precipitation during Isothermal Annealing of P/M High Nitrogen Austenitic Stainless Steels

机译：氮含量对P / M高氮奥氏体不锈钢等温退火过程中析出的影响

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摘要

The aim of the study is to determine the effect of nitrogen content on precipitation reactions in nitrogen alloyed austenitic stainless steels during isothermal annealing up to 500 h at 450℃ and up to 72 h at 750℃. The studied steels were P/M austenitic stainless steels with the nominal composition of 24Cr-22Ni-7.3Mo-3.5Mn-0,3-..0,9N. The studied steels were manufactured by HIPing (Hot Isostatic Pressing) from gas atomized powders. Nitrogen content of the steels was varied by nitrogen alloying of the atomized melt and by further solid state nitriding of the gas atomized powders in a fluidized bed furnace when nitrogen contents exceeding nitrogen solubility in the liquid state were needed. The effect of nitrogen content on precipitation was studied with TEM as well as by tensile testing, Charpy-V impact testing and localized corrosion testing (pitting and crevice corrosion). Precipitating phases in the studied steels were either intermetallic phases (sigma and Laves) and/or chromium nitrides (Cr_2N) depending on the nitrogen content of the steel.
机译：该研究的目的是确定氮含量对氮合金化奥氏体不锈钢在等温退火过程中的影响，该等温退火在450℃下长达500 h，在750℃下长达72 h。研究的钢是标称成分为24Cr-22Ni-7.3Mo-3.5Mn-0,3-.. 0,9N的P / M奥氏体不锈钢。所研究的钢是通过HIPing（热等静压）由气体雾化的粉末制成的。当需要的氮含量超过液态的氮溶解度时，可通过雾化熔体的氮合金化以及通过在流化床炉中进一步对气体雾化的粉末进行固态氮化来改变钢中的氮含量。用TEM以及拉伸试验，夏比-V冲击试验和局部腐蚀试验（点蚀和缝隙腐蚀）研究了氮含量对沉淀的影响。根据钢中的氮含量，研究钢中的析出相为金属间相（σ和Laves）和/或氮化铬（Cr_2N）。

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