3级锚链钢研制

研究了热处理对３０ＭｎＭｏＶ（３０ＭｎＶ）钢显微组织和力学性能的影响，制定了３级锚链钢正火回火工艺，分析了两种钢的特征和组织，在此基础上合理选择了３０ＭｎＭｏＶ应用于锚链，并调整其成分含量。     

Mn—Cr—Mo钢回火组织对冲击韧性的影响

用金相显微镜、扫描电镜和透射电镜观察了分析Ｍｎ－Ｃｒ－Ｍｏ钢回火试验的显微 冲击断口，对粒状贝氏体组织与冲击韧性的关系进行了讨论，认为Ｍｎ－Ｃｒ－Ｍｏ钢轧态试样经６００－７００℃回火后冲击韧性值低下的原因是由于其存在较多的（３０－５０％）粒状贝氏体     

P20塑料模具钢的组织对抛光性能的影响

测试和研究了P20塑料模具钢900℃淬火马氏体和900℃加热450℃等温淬火粒状贝氏体在400～700℃回火的托氏体组织的硬度和表面粗糙度。结果表明，P20钢回火后的硬度越高，粗糙度越低，抛光性能越好；马氏体回火组织较粒状贝氏体回火组织细小，具有良好的抛光性能；当P20模具钢的硬度HRC为32～38时，钢的抛光性能稳定。     

Cr3Mo2V钢中温转变产物及混合组织的回火特性

4Cr3Mo2V钢经1060℃奥氏体化后在不同条件下冷却获得马氏体(M)、下贝氏体、M-A(粒贝和粒状组织)及它们的混合组织。回火特性研究表明：M-A组织的回火稳定性最好，二次硬化效应最高，下贝氏体组织次之，M最差。三种组织及其混合组织的二次硬化机制基本相同。均是由钼铌等形成的碳化物析出造成的，但在中温转变产物及其混合组织的硬化作用中，残余奥氏体AR起一定的促进作用。     

回火温度对40 Cr钢组织和性能的影响

通过拉伸试验、金相组织检验、洛氏硬度及冲击试验,研究分析了450～690℃回火温度下,40Cr钢组织和性能的变化。结果表明,随着回火温度的升高,40Cr钢的抗拉强度、屈服强度、屈强比及硬度单调下降,断后伸长率、冲击吸收功单调上升;回火组织主要为回火索氏体,其形态由保留少量的马氏体形向细密形及粗大形转变;抗拉强度、屈服强度与回火硬度成良好的线性关系。510～660℃回火时,40Cr钢冲击吸收功随回火硬度的升高逐渐降低,且回火硬度为27～29 HRC时降幅最大。     

热处理工艺对25CrMoRE钢组织及性能的影响

文章制定了25CrMoRE钢热处理工艺方案,通过相关实验设备测定了热处理工艺对应下25CrMoRE屈服强度、抗拉强度、延伸率、冲击功、金相组织、夹杂物、晶粒度等技术指标,分析各项数据指标,探讨了热处理工艺对25CrMoRE钢组织及性能的影响规律。     

钒对低钼耐火钢组织及性能的影响

采用扫描、透射电镜对不同钒含量的低钼耐火钢的组织进行分析,确定出热轧状态的组织为先共析铁素体、粒状组织/粒状贝氏体.同时还发现V的析出物在热轧钢中主要固溶于铁素体基体内,600 ℃重新加热时以细小的V(C,N)弥散析出,从而起到高温析出强化的作用.     

焊接热循环对微钙钢组织性能的影响

研究了焊接热模拟工艺参数(峰值温度Tp、焊后冷却时间t8/5)和真实焊接对微钙钢热影响区显微组织和性能的影响.用Lepera着色腐蚀剂腐蚀粒状贝氏体中的M-A组元,观察和研究了不同t8/5的热模拟条件下粒状贝氏体中M-A组元的形态、数量及分布特征.结果表明:当冷却速度较快时,M-A组元主要以杆状呈方向性分布;当冷却速度降低时,M-A组元逐渐变成颗粒状,并失去方向性;真实焊接试验结果与热模拟试验结果相符.     

淬火温度对80mm调质690MPa级低碳贝氏体高强钢板组织性能的影响

通过金相显微镜、扫描电镜、力学性能测试,研究了830～930℃淬火+650 ℃回火对690 MPa高强钢显微组织和力学性能的影响.结果表明:实验钢经两相区830 ℃淬火+650 ℃回火后的组织为板条状铁素体和回火索氏体,其屈服强度较低为679 MPa.淬火温度在完全奥氏体化相区为890～930℃时,随着淬火温度升高,材...     

热处理工艺对辊套材料32Cr3Mo1V性能的影响

研究了热处理工艺对辊套材料32Cr3Mo1V性能的影响,提出了其最佳的热处理方案。     

Short‐term Creep Behavior of an X 37 Cr Mo V 5‐1 Hot‐work Tool Steel with almost Bainitic and fully Martensitic Microstructures

In this study two different heat treatments were conducted on an X 37 Cr Mo V 5‐1 hot‐work tool steel, resulting either in a tempered fully martensitic matrix or a matrix almost consisting of tempered bainite. Short‐term creep tests were performed at a high stress level of 800 MPa and at temperatures in the range from 450 °C to 500 °C. Creep specimens consisting of a tempered fully martensitic microstructure exhibited a three times longer creep‐to‐rupture time, than those consisting of a tempered almost bainitic microstructure. Microstructural investigations of creep specimens were performed by transmission electron microscopy. Results of these investigations revealed that due to a lower cooling rate, which is necessary to form bainite, the tempered bainitic microstructure consists of large former bainitic plates, whereas tempered martensite shows fine former martensitic laths. Tempered bainite also exhibits a higher number density of large M₃C, M₇C₃ and MC carbides than tempered martensite. Small M₂C carbides appear in both microstructures in the same quantity, however, nanometer‐sized MC carbides could only be found in tempered martensite. Thus poor short‐term creep behavior of the tempered almost bainitic microstructure can be explained by the lesser amount of strengthening relevant precipitates, a smaller size‐effect due to distance of bainitic interfaces as well as lower solid solution hardening.     

Microstructures and Mechanical Properties of X100 Pipeline Steel Strip简

Dynamic CCT （continuous cooling transformation） curves and effects of microstructures and M/A islands of X100 hot rolled strip on mechanical properties were studied by means of a thermal simulator, a scanning electron mi- croscope （SEM）, a transmission electron microscope （TEM）, a digital micro-hardness tester and Image-Pro Plus analysis software. The results show that high contents of C and Mo can make transformation lines of acicular ferrite and bain- ite shift rightward. High Mo tested strip has higher strength and micro-hardness and lower toughness than the other one because lath bainite appears instead of quasi-polygonal ferrite. Tested strip with granular bainite, lath bainite and M/A islands has better mechanical properties and in the microstructures lath bainite content is around 36.50% and M/A islands are fine and disperse in the matrix.     

不同锰铬含量对贝氏体钢组织转变的影响

文章利用全自动相变仪对不同锰铬含量的贝氏体钢组织转变进行了试验研究,对比分析了不同锰铬元素含量对贝氏体钢过冷奥氏体相变点的影响,并研究了不同转变温度对贝氏体钢组织转变的影响,试验结果表明贝氏体钢组织转变的最佳温度为330℃,为贝氏体钢生产工艺开发提供了理论依据。     

粒状贝氏体组织对低碳钢力学性能的影响

 在化学成分相同的条件下,分别研究了粒状贝氏体、铁素体 珠光体对低碳合金钢强度、塑性、冲击韧性的影响。结果表明：低碳粒状贝氏体钢比铁素体 珠光体钢具有更高的强度和冲击韧性,而且粒状贝氏体组织对钢的强化方式不仅仅是细晶强化和位错强化,弥散强化也是强化方式之一。     

生产工艺对420 MPa高强度船板钢低温韧性的影响

采用不同的生产工艺制度,对E42船板钢在工业试制生产中所产生的-40℃纵向冲击功波动较大的现象进行了研究.研究表明,在采用两阶段轧制时,由于中间坯的厚度较大,从而对未再结晶区的变形温度产生影响,易于产生在部分再结晶区轧制的现象,使钢板中出现混晶现象,从而造成钢板低温冲击值较低.在轧后快冷中,冷却制度采用不当,会产生粒状贝氏体组织,也影响了钢板的低温冲击功.     

Effect of Nb-V Microalloying on Microstructures and Mechanical Properties of Medium Carbon Non-Quenched and Tempered Steel

Based on optical microscope(OM),transmission electron microscope(TEM) and mechanical performance measurement,the microstructures and mechanical properties of Nb-V micro-alloying non-quenched and tempered steels have been studied.The results showed that the microstructure consists of ferrite and pearlite,in which there exists a lot of intragranular ferrite.Niobium carbide is the main form of carbonitrides,Nb-enriched carbonitrides refine grains,V-enriched carbonitrides have precipitation strengthening effect,which promotes the toughness of the studied steel.The mechanical properties for steels 1,2 and 3 have met the standards required by high load automobile crankshaft,in which the comprehensive property for No.2 is the best.     

硅含量对低碳钢连续冷却中转变组织的影响

通过热模拟压缩实验,对C、Mn含量基本相同,w（Si）对低碳钢在850℃变形后、以30℃/s冷却到室温时的组织演变的影响。结果表明：w（Si）由O．50％增加到0．99％时,硅的增加促进了先共析铁索体的形成,而w（Si）由0．99％增加到1．41％时,硅的增加促进了粒状贝氏体的形成。同时Si对组织中先共析铁素体的晶粒尺寸以及体积分数的变化也有一定的影响。     

回火温度对高锰钢ZGMn13Cr2性能的影响

通过系列回火工艺及拉伸试验 ,研究了回火温度对ZGMn13Cr2性能的影响。结果表明 :ZGMn13Cr2经水韧处理后 ,再经过 2 5 0℃× 6h回火 ,在韧性不降低的情况下 ,强度提高 10 % ,达到国外牌号GX12 0Mn12性能要求。