35SiMnMo截齿钢淬火不同温度回火组织和性能的研究

研制了一种截齿用新型35SiMnMo钢,研究了淬火不同温度回火对新型截齿钢组织与性能的影响。结果表明,35SiMnMo截齿钢在880℃油淬200～350℃回火,具有超高强度和较高的冲击韧度,550～600℃回火,具有高强度和很高的冲击韧度,400℃回火出现回火脆性。880℃油淬350℃以下回火的组织为板条马氏体、贝氏体和残余奥氏体组织,超过350℃回火,碳化物逐渐析出,550～600℃回火组织为索氏体,具有较高的冲击值。880℃油淬200℃回火的冲击试样断裂机制为韧窝机制,400℃回火冲击试样断裂机制主要为准解理断裂。     

40Cr钢淬火工艺研究

研究了完全淬火态40Cr和退火态40Cr进行亚温淬火和低温回火后的组织和性能,确立了920℃淬火+790℃淬火+200℃回火最佳亚温淬火工艺,与常规淬火及低温回火相比较强度bσ提高9%,塑性δ提高16%,韧性αk提高25%,硬度提高6%,磨损质量损耗下降67%。     

基于不同淬回火温度的20MnSiV锚杆钢性能开发

对20MnSiV锚杆钢热处理工艺进行了整体设计,采用了等温退火工艺,研究了不同淬火、回火温度对锚杆钢的力学性能和冲击功的影响,分析了锚杆钢的微观组织性能,提出了增强锚杆钢强度、韧性和冲击功的热处理工艺优化方案。     

回火温度对高强度截齿钢组织和性能的影响

研究了35SiMnMo截齿钢900℃正火后不同的回火温度对其组织及性能的影响。实验结果表明,35SiMnMo钢900℃正火250℃回火强度出现最高值,回火温度在200～300℃时硬度值最高,不同温度回火,冲击韧度在300℃回火出现峰值,400℃出现了回火脆性,超过400℃回火冲击韧度升高。900℃正火、250℃回火试验材料可获得超高强度和一定的冲击韧度,900℃正火+600℃高温回火试验材料可获得高强度和高的冲击韧度。     

35CrMo截齿钢A_(c_3)温度淬火回火时间对其组织和性能的影响

研究了35Cr Mo截齿钢Ac温度加热淬火不同回火时间实验材料组织和性能。结果表明:35Cr Mo钢Ac温度淬火,500℃不同时间回火,随回火时间延长,实验材料的抗拉强度在1 054~960 MPa变化,硬度值在HRC37~32变化,冲击值在62~78 J变化,回火保温时间为6 h时冲击值出现低谷值。35Cr Mo钢Ac淬火,500℃不同保温时间回火的组织主要为索氏体及未溶的铁素体组织,组织细化,回火保温时间在3 h以内实验材料可获得高的强韧性。     

钢的两类回火脆性综述

钢在淬火后需要进行回火处理。在回火过程中要经过一系列转变,一般是硬度和强度降低,延伸率和断面收缩率增加。但随着回火温度的升高, 强度与硬度降低,钢的冲击韧性不是单调上升,而是在250～400℃之间以及500～650℃之间出现两个低谷。在这两个温度范围内回火时,虽然硬度仍有所下降,但冲击韧性并未升高,反而显著下降,如图1所示。淬火钢由于在某些温度区间内回火或从回火温度缓慢冷却通过该温度区间时,引起的脆性(其冲击韧性会比在较低温度下回火时显著降低)现象,称为回火脆性。回火脆性可分为第一类回火脆性和第二类回火脆性两类。回火脆性…     

25SiMnMoV钢粒状贝氏体回火过程研究

研究了２５ＳｉＭｎＭｏＶ钢粒状贝氏体组织和回火过程及其回火组织形态,粒状贝氏体的回火转变主要是（Ｍ－Ａ）小岛的回火转变,包括残余奥氏体转变及马氏体分解。粒状贝氏体经中、高温回火后,在铁素体晶界上存在碳化物偏聚,容易引起组织脆化。     

低温回火对低碳马氏体超高强钢组织及力学性能的影响

研究了低温回火对经过正火+淬火处理的Q1100超高强钢显微组织与力学性能的影响。结果表明,经正火(890℃×40 min)+淬火(890℃×30 min)+回火(185～320℃×90 min)处理的实验钢主要获得回火马氏体组织。不同温度回火后,实验钢抗拉强度均大于1 360 MPa、屈服强度均大于1 200 MPa、硬度均大于400HV3、延伸率均大于13%、-40℃冲击功均大于35.0 J。随着回火温度升高,实验钢抗拉强度逐渐下降,屈服强度先上升后下降,硬度逐渐降低,断后延伸率先略微下降后逐渐上升,-40℃冲击功先下降后上升。回火温度230℃时,实验钢抗拉强度(1 445 MPa)、屈服强度(1 238 MPa)、硬度(429HV3)、塑性(13.8%)和-40℃冲击韧性(47.5 J)均表现优异,大幅超过Q1100级工程机械用超高强钢的服役标准。     

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。     

淬火工艺对27SiMn钢组织和性能的影响

研究了淬火工艺对27SiMn钢组织和力学性能的影响。实验表明, 830～930 ℃温度范围内“零保温”淬火, 随淬火温度升高, 27SiMn钢的强度、硬度增加; 高于930 ℃后, 强度、硬度逐步下降。该钢“零保温”淬火得到细小的板条状马氏体组织, 其原因与奥氏体晶粒细化和奥氏体中碳分布不均匀有关。采用(910±10)℃淬火、(630±10)℃回火的“零保温”调质工艺处理的27SiMn钢缸体, 力学性能完全满足技术要求。     

23MnNiMoCr54链条钢回火特性的数值模拟

通过对矿用链条钢在不同温度经 1h回火后硬度的数据处理 ,运用淬火钢回火理论方程 ,对 2 3MnNiMoCr5 4钢回火硬度与回火温度和回火时间之间的定量关系进行了数值模拟和验证 ,为合理确定 2 3MnNiMoCr5 4钢短时回火工艺参数提供科学依据。     

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

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

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…     

Methods to gain better efficiency of driving steel pipes into the ground by the pneumatic hammers

The regularities of the relationship between residual advancing of a pipe driven into the ground and the parameters of the external influence on it are established. The basic research trends are formulated to raise the efficiency of impact action on the pipe. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 81–88, November–December, 2005.     

钢锻模热处理工艺的改进

介绍以5CrMnMo为材质的热锻模及几种热处理方法在我公司的应用,说明了模具的制作过程,并根据模具 的结构、模具用于被施锻件的材质、模具所要求的硬度和韧性性能等要求,介绍常规淬火热处理和等温淬火热处理 工艺、超高温淬火热处理三种工艺方法的优缺点。     

冷拔钢丝残余应力的研究综述

综述了近年来对冷拔钢丝残余应力的研究状况,阐述了残余应力的形成机理及对冷拔钢丝性能的影响,并重点介绍了衍射法和有限元法在计算冷拔钢丝残余应力中的应用.     

M15槽帮钢压制分析

主要阐述了M15槽帮钢的压制过程及其受力分析 ,并计算了其毛坯尺寸 ,说明了压制中需注意的问题