准贝氏体钢回火脆性研究

介绍一种新型贝氏体铸钢材料,应用于综合采煤机截齿。这种钢通过适当的热处理,获得准贝氏体。其强度高且韧性好。其组织特征是,钢中的碳全部固溶于贝氏体铁素体和奥氏体中,不析出碳化物,基体组织贝氏体铁素体是含碳、硅等元素的过饱和固溶体,其亚结构为高密度位错,不存在孪晶;富碳奥氏体稳定性高,以薄膜状高度均匀的分布于贝氏体铁素体板条之间,与贝氏体铁素体交替均匀排列。准贝氏体钢在回火后使用,但对其回火组织和机械性能的变化研究较少,尤其是关于回火脆性的报道更少。因此,研究准贝氏体的回火脆性,在理论上和实用上都是很有必要的。     

回火温度对BZ-30准贝氏体钢组织及力学性能的影响

自Bain于上世纪30年代发现贝氏体组织后,半个多世纪以来,国内外对贝氏体和贝氏体钢进行了大量的研究,取得很大的进展。众所剧知,上贝氏体组织力学性能较差,生产上应尽量避免。下叭氏体组织具有较高的强度,但组织中的ε碳化物降低其韧性。近年来,发现一种无碳化物贝氏体（准贝氏体）,其组织特征是：钢中的碳全部崮溶于叭氏铁素体和奥氏体中,不析出碳化物;基体组织贝氏铁素体是含碳、硅元素的过饱和崮溶体,其亚结构为高密度位错,不存在孪晶;稳定性很高的富碳奥氏体,以薄膜状高度均匀地分布于贝氏铁素体板条之间,与贝氏铁素体交替均匀排列,凶而具有很高的强度和韧性。BZ-30是研究开发的新型准贝氏体钢,它强度高,韧性好,具有优异的综合力学性能。分析回火温度对新型BZ-30准贝氏体钢组织和力学性能的影响,弄清贝氏体回火脆性产生的原因,对于该钢的使用,有其重要意义。本文研究了回火温度对新型BZ-30准贝氏体钢组织和力学性能的影响,探时了贝氏体回火脆性产生的原因。     

无碳化物贝氏体耐磨钢回火组织与性能的研究

研究了新型碳化物贝氏体耐磨钢不同回火温度下的组织与力学性能。结果表明,无碳化物贝氏体耐磨钢具有较高的回火抗力,在300～350℃回火具有良好的综合力学性能,450℃回火出现回火脆性。提出了适合无碳化物贝氏体耐磨钢的最佳回火工艺,并介绍了无碳化物贝氏体钢的工况及应用结果。     

准贝氏体钢矿用高强度圆环链试验研究

将准贝氏体钢应用于矿用高强度圆环链，试验结果表明，准贝氏体钢制造的矿用高强度C级圆环链，性能完全满足国家标准要求，与进口圆环链专用钢的性能对比表明，准贝氏体钢可以替代进口圆环链用钢23CrMnNiMoA，是一种新型矿用高强度圆环链用钢。     

新型渗碳准贝氏体钢重型钎杆的组织与性能

研究了准贝氏体钢的组织、力学性能及渗碳性能,结果表明,准贝氏钢具有良好的强韧性和优越的渗碳性能。介绍了制造重型钎杆的生产工艺及使用效果     

新型贝氏体钢及在矿山机械领域的应用

电力、矿山、工程机械等工业部门的生产设备中，许多工件因磨损而失效，所造成的材料浪费及频繁的停工给生产企业造成巨大的损失。易损件耐磨性能差寿命低，已成为生产发展的严重障碍之一。长期以来，有关部门把提高磨损件耐磨性及使用寿命列为重点攻关项目。因此研制新型耐磨材料降低其耐磨材料的消耗，降低企业的生产成本，具有重要的经济意义。本文介绍了新型高强、高韧、耐磨贝氏体钢的组织及力学性能特点，介绍了该新型耐磨材料在采矿机械方面的应用成果，为耐磨材料的应用提供选材依据。     

贝氏体钢槽帮端头的研制及应用

介绍了贝氏体钢槽帮端头的材料选择、研制工艺、性能试验以及在综采工作面进行的工业性试验结果。     

淬火钢回火性能影响因素探讨

通过例举实例,对影响淬火钢回火性能的几种因素进行了探讨,掌握了回火性能的变化规律,以便正确制定回火工艺,正确进行回火操作以保证工件的力学性能、组织性能和使用性能。     

新型高强度准贝氏体钢及其在煤矿的应用

准贝氏体钢与一般钢材相比,具有更好的综合力学性能,良好的焊接性,不热处理或少热处理等特点,可广泛用于制作矿车构件,矿车弹簧件及链条,铁路钢轨和钻杆,井架及钢筋混凝土、轨枕等,其技术性能良好,节能效果显著,经济效益明显。随着煤炭工业的发展,机械化程度的提高,准贝氏体钢在煤矿的应用有着广阔的前景。     

The effect of tempering temperature on the microstructure and mechanical properties of ultrahigh strength 23CoNi steel plate

The effect of tempering temperature on microstructure and mechanical properties of 23CoNi steel plate has been studied. Tempering in the temperature range of 100-460℃, the ultimate tensile strength σb tends to change along a curve which has the shape of the letter “n“, the peak of the σb occurs in the range of 460-475℃, beyond the peak, σb deceasing as the temperature increasing. Tempering in the temperature range of 100-200℃, the impact property αku increases as the temperature goes up. After 200℃, αku goes down as the temperature increases, when the tempering temperature goes higher than 460℃, αku goes up again tempering at higher than 485℃, the acicular alloying carbides M2C precipitate from matrix. The orientation relationship between M2 C and matrix coincides with follows: (011)α//(001)M2c, [100]α//[100] M2c.We found out a new order phase B2 which dispersing in the matrix and the size is very small. This paper discusses the reason of the formation of this new order phase and the sequence of effects to mechanical properties. With the increasing of the tempering temperature, both MaC and new order phase growing up. As the tempering temperature goes beyond 470℃, the amount of retained austenite tends to go up, higher than 510℃, the growing up of reverted austenite is accelerative. It is identified that retained austenite is coming from the reverse transformation. Tempered at higher than 550℃, we can easily find the reversion austenite which contains much more Nickel than matrix does and emerged in the bulk form under TEM.     

The effect of tempering temperature on the microstructure and mechanical properties of ultrahigh strength 23CoNi steel plate

The effect of tempering temperature on microstructure and mechanical properties of 23CoNi steel plate has been studied. Tempering in the temperature range of 100-460℃, the ultimate tensile strength σb tends to change along a curve which has the shape of the letter "n", the peak of the σb occurs in the range of 460-475℃, beyond the peak, σb deceasing as the temperature increasing. Tempering in the temperature range of 100-200℃, the impact property αku increases as the temperature goes up. After 200℃, αku goes down as the temperature increases, when the tempering temperature goes higher than 460℃, αku goes up again tempering at higher than 485℃, the acicular alloying carbides M2C precipitate from matrix. The orientation relationship between M2 C and matrix coincides with follows: (011)α//(001)M2c, [100]α//[100] M2c.We found out a new order phase B2 which dispersing in the matrix and the size is very small. This paper discusses the reason of the formation of this new order phase and the sequence of effects to mechanical properties. With the increasing of the tempering temperature, both MaC and new order phase growing up. As the tempering temperature goes beyond 470℃, the amount of retained austenite tends to go up, higher than 510℃, the growing up of reverted austenite is accelerative. It is identified that retained austenite is coming from the reverse transformation. Tempered at higher than 550℃, we can easily find the reversion austenite which contains much more Nickel than matrix does and emerged in the bulk form under TEM.     

CrMnMo空冷耐磨钢调质处理的组织与性能的研究

为了实现以CrMnMo空冷耐磨钢作为新型极硬岩石反井破岩滚刀刀体材料的设计，对CrMnMo空冷耐磨钢调质处理的组织与性能进行了研究．通过研究，搞清了CrMnMo空冷耐磨钢在调质处理时的显微组织、断口形貌及淬火加热奥氏体化温度；从根本上解决了CrMnMo空冷耐磨钢的力学性能、耐磨性、硬度与回火温度的关系等关键技术问题．与中硬岩石破岩滚刀刀体材料ZG30GrMnSiTi相比，在硬度相当的条件下，冲击韧性提高了50％，耐磨性提高了10％，较好地解决了新型极硬岩石反井破岩滚刀使用寿命低的技术难题．     

The effect of tempering temperature on the microstructure and mechanical properties of ultrahigh strength 23CoNi steel plate

1 Introduction23CoNi (0 .23C-14Co-2Ni-3Cr-1 Mo) steel is an ultrahigh strength steel with high alloy .It exhibitshigh strength,good toughness and excellent corrosion resistance . The tensile strength of 23CoNi is above1930 MPa andfracture toughness tends to higher than 110 MPam.It is not only usedto make critical air-craft parts ,such as landing gear ,joints etc .,but alsois used for bulletproof material .It is a kind of sec-ondary hardening alloy steel ,strengthened by the precipitation…     

氧在散体煤中的分形反应动力学研究

定义了散体煤的概念,分析了散体煤的结构,应用分形几何理论,分析了氧气在分形散煤体中的运移规律,推导了散体煤粒度分布维数、孔隙分形维数和粒度与孔隙分维的关系表达式.引入分形概率密度的概念,建立了氧气在散体煤中的分形扩散方程和散体煤颗粒分形表面氧气吸附速率方程.     

颗粒过滤器除尘效率的实验研究与数学建模

为开发煤热解工艺的高温荒煤气脱尘技术,在错流式固定床颗粒过滤实验平台上测试了表观气速、粉尘浓度、过滤介质粒度和床层厚度等关键参数对除尘器除尘效率的影响。结果表明,粉尘浓度在10.0~96.8 g/m~3范围内增大且颗粒床表层过滤作用显著时,除尘器效率先增大后减小;大粒径瓷球对应的除尘效率较低,但压降降低显著;床层厚度增大,过滤器的除尘效率和压降均增大。过滤器运行初始状态,床层过滤过程属于深层过滤,随粉尘在床层内沉积,迎流面表层过滤作用增强,可直接脱除45.0%~52.0%的粉尘。建立了描述错流式颗粒过滤过程的一维非稳态数学模型,使之可以预测过滤平台在不同操作条件下的净床除尘效率和粉尘沉积率。应用该模型,预测热解气气氛下过滤器(床层厚度0.6 m,填充6 mm瓷球)的净床除尘效率有所下降,为82.94%。     

YDZ(A)井下直流电法仪在煤矿的应用

介绍了井下直流电法仪在煤矿的应用,对直流电法仪的优缺点和应用中需注意的问题进行了总结和讨论。     

饱和含水石灰岩散体蠕变过程中孔隙度变化规律的试验

利用一种破碎岩石渗透特性试验系统进行了饱和含水状态下石灰岩散体的蠕变试验.通过回归分析得到了蠕变过程中孔隙度的变化率与当前孔隙度、应力水平之间的关系.研究表明：在恒定应力水平下，孔隙度的变化率与当前孔隙度之间可用三次多项式拟合；在不同应力水平下，多项式系数取决于轴向应力与岩芯单轴抗压强度的比值，并且可用该比值的幂函数拟合.     

变质处理M2高速钢的组织和性能研究

用Y -K -Na对M2高速钢进行复合变质处理 ,研究了变质处理对M2高速钢组织和性能的影响。结果表明 ,M2铸造高速钢经Y -K -Na复合变质处理后 ,组织明显细化 ,共晶碳化物由网状分布变为块状和团球状 ,冲击韧性提高 70 7% ,耐磨性也明显提高 ,各项力学性能接近锻造M2高速钢的水平。