热处理对高铬铸铁磨球组织与性能的影响

探讨了热处理工艺对高铬铸铁磨球硬度和冲击性能的影响 ,并对不同淬火和回火后的磨球组织进行了分析。结果表明 ,采用 980℃× 3h风冷 +40 0℃× 3h炉冷的热处理工艺 ,生产出的高铬磨球硬度达 6 0 5HRC ,冲击韧度αK 达 6 8J/cm2 。     

含铜抗菌马氏体不锈钢的组织与性能

通过在1Cr13中加入适量的铜,并经过特殊的热处理,可使不锈钢析出ε-Cu相,并在水中溶出铜离子,从而具有优良的抗菌特性.实验结果表明,铜的加入可以使不锈钢晶粒细化,具有较高的强度和硬度,但使腐蚀速度略有增加,并减小了钝化区间.     

热处理对9Cr低活化马氏体钢组织和力学性能的影响

研究了热处理对9Cr低活化马氏体钢显微组织和力学性能的影响.用光学显微镜和扫描电子显微镜观察了材料的显微组织、拉伸断口和冲击断口;用X射线衍射仪检测了材料的晶体结构.结果表明:9Cr低活化马氏体钢的晶粒尺寸从950℃的6.28μm增加到1200℃的66.5μm.两种热处理工艺(950℃×30min水冷+780℃×90min空冷和1050℃×30min水冷+780℃×90min空冷)处理后的9Cr低活化马氏体钢显微组织为全马氏体.二种工艺处理后拉伸力学性能相近,但冲击性能差别明显.二者的韧脆转变温度分别为-72℃和-62℃.选择950℃×30min水冷+780℃×90min空冷的热处理工艺能够提高9Cr低活化马氏体钢的冲击韧度.     

热处理对Ti微合金化马氏体钢强度的影响

对Ti微合金化马氏体钢经不同工艺热处理后的屈服强度进行了研究,并分析了其强化机制。研究表明,Ti微合金化使钢中形成细小的TiC析出相,可以提高马氏体钢的屈服强度。经过回火与再加热淬火工艺处理后,可形成1～10 nm的TiC析出相,使得马氏体钢晶粒细化到约8μm。理论计算与实验数据关于TiC提供的析出强化与细晶强化效果良好吻合,即通过Ti微合金化及回火再加热工艺,由TiC析出相提供的析出强化达到188 MPa,TiC钉扎晶界使得晶粒细化而产生的细晶强化效果为80 MPa。     

Effect of Tempering on the Structure and Properties of High-Purity Martensitic Steel

Metal Science and Heat Treatment -     

Heat Treatment and Properties of Nitrogen Alloyed, Martensitic, Corrosion-resistant Steels

This paper gives a short introduction to the typical process route and material properties of these steels in comparison to standard martensitic corrosiun-resistant steels. The typical response of these steels to various heat treatment parameters is shown and explained using the three grades M333, N360 and M340 (all made by Boehler Edelstahl GmbH) as examples, and the physical metallurgy of these steels and its consequences for practical heat treatment is explained. The correlation between tempering parameters and their effect on the toughness and corrosion properties is explained in particular detail, showing that these new steels not only offer far better properly combinations under the usual heat treatment parameters than standard martensitic corrosion-resistant steels, but that they also open the door to extending heat treatment combinations and properties.     

后热处理对新型马氏体耐热钢焊缝性能的影响

针对电力施工过程中对具有冷裂倾向的马氏体型耐热钢焊后后热处理时机选择与标准存在差异，即是否必要在冷却至100-120℃恒温一段时间后再进行后热处理的问题，安排了一系列的试验对后热处理的最佳时机予以讨论，对热处理后的焊缝组织进行力学性能试验和金相分析，对冲击后的试样进行了断口分析。试验证明，后热处理时机的不同对马氏体耐热钢焊缝冲击韧度有比较大的影响，马氏体耐热钢的后热处理应在马氏体转变完全后开始较为合适。     

中低碳铬硅锰马氏体铸钢热处理工艺研究

研究了不同热处理工艺对铬硅锰马氏体钢性能的影响.将铸钢件在830～860℃的温度下保温2h;在180～230℃温度下进行等温淬火或者不完全淬火,保温0.5 h;在340～430℃的温度区间内,保温lh;然后淬火至室温.最后采用激光器对钢件表面进行扫描式加热.结果表明,中低碳铬硅锰马氏体铸钢在保持一定强度水平的前提下塑韧性明显改善,拉伸强度达1 600MPa以上,伸长率为10％以上,平均硬度为HV570～600,明显高于基体硬度HV450,且综合力学性能比传统淬火回火热处理工艺显著提高.     

Effect of Chemical Composition and Heat Treatment on Mechanical and Corrosion Properties of High-Chromium Nitrogen Steels

The effect of alloying of high-chromium nitrogen steels with manganese and nickel on their mechanical and corrosion properties is studied. Preferred modes of heat treatment providing the best combination of properties are presented.     

低碳高强钢热处理后的组织和力学性能

研究了低碳高强钢在不同淬火和回火温度下的显微组织和力学性能。结果表明,随淬火温度升高,强度呈现先升后降的趋势,冲击功先缓慢增长再急剧下降;随着回火温度升高,强度逐渐降低,冲击功逐渐增大。当淬火温度为900℃、回火温度为500℃时,回火屈氏体细小致密,碳化物均匀分布,钢的综合力学性能较好。     

渗硼后的热处理工艺对50CrNiMo钢力学性能的影响

研究了5CrNiMo钢渗硼后的热处理工艺规范对钢的组织和性能的影响。结果表明，渗硼后常温淬火组织以针状马氏体为主，高温淬火组织以板条马氏体为主；渗硼后进行高温淬火回火能够显著提高冲击韧度；随淬火温度提高，耐磨性略有下降。     

Study of Steel P92 Microstructure and Mechanical Properties after Different Heat Treatment Regimes

Metal Science and Heat Treatment - The effect of normalizing in the temperature range 950 – 1150°C with subsequent tempering for 2 h at 760°C on the microstructure of Cr – Mo...     

不同热处理后自动化机械用TWIP钢的热影响区性能及组织

采用激光焊与钨极氩弧焊两种方式对孪生诱导塑性钢的焊接性能进行研究,分析了两种焊接方式对焊接热影响区和焊缝区晶粒状态和力学性能的影响。结果表明,采用激光焊比钨极氩弧焊得到的晶粒要细小,但两种方式都使孪生诱导塑性钢的断后伸长率降低。     

Microstructural Modifications of As-Cast High-Chromium White Iron by Heat Treatment

The initial as-cast microstructure of a high-chromium (2.35% C, 18.23% Cr) white cast iron consisting of primary austenitic dendrites and a eutectic mixture of M₇C₃ carbides/austenite was extensively modified by four different heat treatments: H.T.A: destabilization (970 °C-2.5 h), H.T.B: destabilization/subcritical treatments (970 °C-2.5 h + 600 °C-13 h), H.T.C: subcritical treatment (600 °C-13 h) and H.T.D: subcritical/destabilization treatments (600 °C-13 h + 970 °C-2.5 h). H.T.A leads to martensitic structures that present considerable precipitation of cubic secondary carbide particles of M₂₃C₆ type. H.T.B produces pearlitic structures and causes further carbide precipitation and pre-existent carbide particle shape modifications. H.T.C extensively modifies the initial as-cast structure to more pearlitic morphologies accompanied with spheroidization/degradation of the M₇C₃ primary carbide structure. H.T.D causes extensive formation of secondary carbide particles within the primary austenitic matrix; the latter has been mainly transformed to martensite. The effect of each heat treatment on the hardness of the alloy was correlated with the attained microstructure.     

Structure and Properties of Low-Alloy High-Nitrogen Martensitic Steels

Special features of structure formation and mechanical properties of low-alloy martensitic steels with superequilibrium content of nitrogen and low content of carbon are considered. Experimental data on the effect of the temperature of heating for hardening and tempering on the structure, strength, and ductility of these steels are presented. The advantages and disadvantages of the introduction of nitrogen into low-alloy martensitic steels instead of carbon are discussed. It is shown that steel 10Kh3A combines high strength with high ductility. This steel is considered as a material for heavily loaded parts and nonwelded structures instead of high-strength steels alloyed with Ni, Mo, V and other expensive and scarce elements.     

马氏体不锈钢的光亮热处理

简要介绍了马氏体不锈钢真空热处理和可挖气氛热处理两种光亮热处理的特点及其现场应用,生产实践证明,马氏不锈钢采用光亮热处理能最大限度地发挥材料和工艺技术优势。