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| 1 | IMPROVEMENT OF TYPE IV CRACKING RESISTANCE OF 9Cr HEAT RESISTING STEEL WELDMENT BY BORON ADDITION显示文摘Creep lives of high Cr ferritic heat resisting steel weldments decrease due to Type IV fracture, which occurs as a result of formation and growth of creep voids and cracks on grain boundaries in fine-grained heat affected zone (HAZ). Because boron is considered to suppress the coarsening of grain boundary precipitates and growth of creep voids, we have investigated the effect of boron addition on the creep properties of 9Cr steel weldments. Four kinds of 9Cr3W3CoVNb steels with boron content varying from 4.7×10-5 to 1.8×10-4 and with nitrogen as low as 2.0×10-5 were prepared.The steel plates were welded by gas tungsten arc welding and crept at 923K. It was found that the microstructures of HAZ were quite different from those of conventional high Cr steels such as P91 and P92, namely the fine-grained HAZ did not exist in the present steel weldments. Boron addition also has the effect to suppress coarsening of grain boundary carbides in HAZ during creep. As a result of these phenomena,the welded joints of present steels showed no Type IV fractures and much better creep lives than those of conventional steels. | M.Tabuchi M.Kondo T.Watanabe H.Hongo F.Yin F.Abe | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，4： | 3 |
| 2 | The effect of grain size on the corrosion behavior of inconel 600 in high-temperature steam显示文摘 | F.Abe H.Araki H.Yoshida M.Okada R.Watanabe | | 0，，12： | 1 |
| 3 | 长期的蠕变过程中304H不锈钢微观结构的演变和硬度变化显示文摘对于18Cr-8Ni(304H型)不锈钢在长期的蠕变过程中微观结构的演变和硬度变化的研究已经完成,蠕变和蠕变开裂实验在温度为550~750℃(823~1023K)之间,持续时间180000h条件下进行。研究表明蠕变过程的硬化现象取决于钢的应力水平,以及M23C6碳化物和σ相的沉淀物。在177MPa的高应力下,蠕变期硬化比无应力硬化大得多,表明蠕变硬化主要是由蠕变形变产生的应变硬化引起。在蠕变的后期,由于晶间位错的恢复出现软化现象,因此应力下降和试验时间的延长变得更为重要。随着应力水平的降低和试验时间的延长,应变硬化消失。在61MPa低应力以下,除蠕变的最后阶段外,蠕变硬化可以近似地看作为无应力下的基本硬度。 | H.Tanaka M.Murata F.Abe H.Irie 蒋利军(翻译) | 2006 | 广石化科技2006，，2： | 0 |
| 4 | LONG-TERM CREEP AND RUPTURE PROPERTIES OF HEATRESISTING STEELS AND ALLOYS显示文摘The present status of NRIM Creep Data Sheet Project and the recent activities of long-term creep and rupture studies on heat resisting steels are described. The project has been continued to produce long-term data such as 100 000h-creep rupture strength for 47 kinds of principal heat resisting steels and alloys, including welded joints. The long-term creep deformation behavior and microstructural evolution during creep have been shown to be complicated. | K.Yagi F.Abe | 1998 | Acta Metallurgica Sinica(English Letters)1998，11，6： | 0 |
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