共查询到19条相似文献,搜索用时 140 毫秒
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设计了含Ni和无Ni两种纳米结构贝氏体钢种,进行了不同温度下等温淬火热处理实验,目的是研究Ni对等温淬火纳米结构贝氏体钢相变、组织和性能的影响。结果表明,与连续冷却工艺不同,在等温淬火过程中,Ni元素的添加降低了贝氏体相变驱动力,减少贝氏体体积分数,同时使TTT曲线右移,减慢等温贝氏体相变动力学。此外,在等温淬火后,Ni元素的添加提高钢的冲击性能,但由于贝氏体量的减少和残余奥氏体的增多,使钢的拉伸性能降低。其次,随着相变温度的升高,含Ni钢和无Ni钢的强塑积略有增加。 相似文献
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国家科委冶金新材料组、中国金属学会特殊钢学术委员会第四届低温用钢学术会议于1982年10月6日至10日在柳州召开.参加会议的有31个单位51名代表.会议收到论文二十多篇,内容涉及低温用钢应用基础理论研究、材料性能测试、钢种研究的新成果等方面,反映了近两年来我国低温用钢领域科研、生产的概貌.会议论文反映了基础理论研究有一定深度.如以锰代镍钢的低温性能研究、低温钢物理性能的研究、9%Ni钢中回转奥氏体与低温韧性的研究、低温相变金相方法研究、铁基马氏体相变及其应用等方面都取得了新的进展;研究出一批新的低温材料其中有用于液氦温度的超导结构材料、超低温无磁不锈钢Cr13Ni9Mn9N、铁锰铝系的30Mn20A13无磁钢及低温钢、30Mn23Al4Cr5超低温无磁钢.会议评选出十篇优秀论文提交特钢学委会出版《特殊钢文集》,还酝酿了推选论文参加 相似文献
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氧化物弥散强化(Oxide dispersion strengthened, ODS)钢因其良好的高温力学性能和抗辐照性能被认为是钠冷快堆包壳材料的重要候选材料. 本文通过机械合金化以及热等静压和锻造工艺制备了15Ni?15Cr ODS奥氏体钢,并且采用相同工艺制备了不加氧化物的15Ni?15Cr奥氏体钢作为参比材料. 利用透射电镜对样品的微观结构进行分析,发现15Ni?15Cr和15Ni?15Cr ODS奥氏体钢晶粒尺寸分别为0.75和0.5 μm. 15Ni?15Cr ODS奥氏体钢中分布的氧化物弥散粒子主要为δ-Y4Zr3O12以及少量的Al2O3. 15Ni?15Cr ODS奥氏体钢中氧化物弥散粒子的平均粒径为12.8 nm、数密度5.5×1022 m?3、粒子间距26 nm. 相比于15Ni?15Cr奥氏体钢,15Ni?15Cr ODS奥氏体钢具有更高的强度,但是高温塑性有所降低. 15Ni?15Cr ODS奥氏体钢的室温断裂机制为韧性断裂,高温断裂机制为韧–脆混合断裂. 相似文献
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《钢铁研究学报(英文版)》2011,(Z1):325-330
Focusing on the banded microstructure formed during the production of 06Ni9 steels for cryo-LNG,this paper examines its formation,distribution of alloying elements,structure,hardness,and low-temperature property.The results show that the banded microstructure formed after hot-rolling and cooling of the steel binct in which the element segregation occurred during solidification.The phase change during heat treatment also can cause the formation of the banded microstructure of 06Ni9 steel.The white bands are mainly composed of ferrite and reversed austenite,and the black bands are mainly composed of reversed austenite and a certain amount of ferrite.Element segregation and formation of more carbide caused some black regions to appear.Grain refinement of 06Ni9steel is beneficial to the formation of reversed austenite,the redistribution of alloying elements,improving the stability of austenite and the low-temperature toughness of steel.This steel easily undergoes nickel segregation;thus,undergoing a secondary quenching and tempering process is recommended.The refinement of martensite quenching above A c3,the martensite that is rich in nickel and carbon,residual austenite and a few little of ferrite after secondary quenching lower than A c3 are beneficial to the formation of high stability austenite.Thus,this can meet the strength and toughness requirement of the low temperature 06Ni9 steel. 相似文献
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氮对304奥氏体不锈钢组织和力学性能的影响 总被引:7,自引:2,他引:5
在0Cr18Ni9奥氏体不锈钢成分基础上,加入一定的氮,并使钢中的镍含量控制在标准下限含量的条件下,研究了氮对组织和力学性能的影响。结果表明:加氮后钢的强度提高,奥氏体稳定不变,固溶态组织不变,而敏化后晶界析出物类型有所不同。 相似文献
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本文采用电化学、盐雾试验、酸溶液中的耐蚀性试验等腐蚀试验方法,评价了Cr、Mo、Ti、Cu等元素的作用,同时采用力学试验和各种成型试验方法探讨了上述元素的影响。根据试验结果成功地开发了既具有可以和1Cr18Ni9Tj相媲美的不锈耐蚀性能;又具有Cr17型不锈钢美观、价廉等特征的新型深冲用不锈钢00Cr17MoTiCu。该新型不锈钢可广泛应用于食品加工、厨房设备、轻工纺织、建筑五金等行业。 相似文献
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LI Zhuang 《钢铁研究学报(英文版)》2010,17(1):59-63
In the present paper, the machinability tests were conducted by using various processing parameters on a CA6164 lathe with a dynamometer. The metallurgical properties, machinability and mechanical properties of the developed alloy were compared with those of an austenite stainless steel 1Cr-18Ni-9Ti. The results have shown that the machinability of the austenitic stainless steels with free-cutting additives is much better than that of 1Cr-18Ni-9Ti. This is attributed to the present of machinable additives. The inclusions might be composed of MnS. Sulfur and copper addition contributes to the improvement of the machinability of austenitic stainless steel. Bismuth is an important factor to improve the machinability of austenitic stainless steel, and it has a distinct advantage over lead. The mechanical properties of the free cutting austenitic stainless steel are similar to that of 1Cr-18Ni-9Ti. A new Pb-free austenitic stainless steel with high machinability as well as satisfactory mechanical properties has been developed. 相似文献
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I. O. Bannykh 《Russian Metallurgy (Metally)》2017,2017(11):968-973
The main mechanisms of hardening nitrogen-bearing austenitic steels that operate under various thermomechanical treatment conditions at various steel compositions are considered. The strength properties of the steels are shown to depend on the content of interstitial elements, namely, carbon and nitrogen, and the influence of these elements on the stacking fault energy is estimated. The ratios of the main alloying elements that favor an increase or a decrease in the stacking fault energy are found to achieve the desirable level of strain hardening provided that an austenitic structure of steel is retained. 相似文献
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《Baosteel Technical Research》2010,(Z1):80
Nitrogen plays a vitally important role for improving properties for stainless steels in many aspects.In this paper,the physical metallurgy behavior and the beneficial effects of nitrogen on corrosion resistance and other mechanical properties of stainless steels were summarised.Based on nitrogen alloying,various stainless steel products,such as austenitic,duplex and martensitic staniless steels were developed with enhanced properties,such as corrosion resistance,mechanical strength and weldability,among other things. 相似文献
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In the recent situation of a historically high nickel price, austenitic stainless steels, such as 1.4301, became too expensive compared to their actual technical value in many applications. This paper presents two new stainless steel grades developed by ArcelorMittal to replace 1.4301. The first one is a 20%Cr ferritic grade. The second one is a low‐Ni Cu‐bearing austenitic grade. The choices in the compositions are described as a function of the technical requirements, economical target and the production process limitations. The final properties are discussed as a function of the composition and compared with 1.4301 and other existing stainless steels. Finally, the complementarities of these two new grades are highlighted in regard to the different application markets considered. 相似文献