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一种高强度加长螺栓断裂失效分析

针对一起高强度加长螺栓在装配过程中发生突然断裂事故，从螺栓断口宏、微观形貌特征入手，通过逐步深入分析，确定螺栓断裂失效的主要模式为氢脆延迟断裂，断裂成因是由于冶炼或浇铸控制存在问题所造成。

关键词: 高强度螺栓 , failure analysis , SEM , metallography , intergranular fracture

Y 对8090Al-Li 合金拉伸性能和断裂行为的影响

研究了两种不同Y 含量对8090Al-Li 合金拉伸性能及断裂行为的影响。实验表明:加入0.1wt-%Y 可在不降低强度的情况下提高合金的塑性,加入0.5wt-%Y 可在不降低塑性的情况下提高合金的强度。在峰值时效条件下,不加Y 的合金断裂为穿晶韧窝型和沿晶塑性混合方式,并伴有沿晶二次裂纹,加0.1...

关键词: A—Li 合金 , rare earth element Y , tensile properties , intergranular fracture , transgranular fracture

淬火高碳马氏体沿晶断裂机制

刘宗昌

金属学报

提出马氏体沿晶断裂机制:粗大奥氏体晶粒转变为马氏体时,以晶粒为体积膨胀单元,必然产生不均匀应变,在晶界区形成显微局部应力,甚至产生应力集中,削弱晶界结合,有时出现微裂缝,在淬火第一类应力(或外力)作用下,形成沿原奥氏体晶界扩展的沿晶裂纹和冰糖状断口。

关键词: 淬火马氏体 , intergranular fracture , inhomogeneous strain

δ-Ni_3Nb对Inconel718合金低周疲劳断裂行为的影响

洪班德 , 伊晓 , 孟庆昌

金属学报

本文研究了δ-Ni_3Nb相的尺寸及分布对Inconel718合金在650℃,恒应变控制循环应变作用下断裂行为的影响。结果表明,由高温固溶及中间时效造成的δ相沿晶界的锯齿状分布,可以提高材料对裂纹沿晶扩展的抗力,使低周疲劳断口由标准工艺处理后的沿晶型转变为穿晶。但是,与形成锯齿晶界的工艺相伴随的,δ...

关键词: 片状δ-Ni_3Nb相 , fatigue life , intergranular fracture

Al—Li合金的晶界断裂

姚大平 , 张匀 , 胡壮麒 , 李依依

材料研究学报

本文研究了两种晶粒组织的二元Al-Li 合金拉伸性能与断裂行为。结果表明Al-Li 合金力学性能与晶粒尺寸有关,其断裂行为决定于PFZ 内平面滑移或晶界沉淀相与滑移的交互作用。

关键词: Al—Li合金 , intergranular fracture , planar slip

固溶温度对Ti-5Mo-5V-2Cr-3Al钛合金组织性能的影响

魏衍广 , 陶海明 , 罗峥 , 崔雪飞

航空材料学报 doi:10.11868/j.issn.1005-5053.2014.5.001

对Ti-5Mo-5V-2Cr-3Al钛合金φ10/mm棒材在不同固溶时效制度下的拉伸断口形貌与显微组织进行分析,研究了断口形貌及显微组织对力学性能的影响.结果表明:当材料在相变点以下固溶时效时,随着固溶温度的升高,初生α相减少,β晶粒长大,断口纤维区变小,韧窝变大变浅,断裂方式由韧性断裂逐渐变成准解...

关键词: Ti-5Mo-5V-2Cr-3Al钛合金 , 固溶时效 , 断口形貌 , 显微组织 , 力学性能 , 沿晶断裂

PREVENTION OF THE INTERGRANULAR FRACTURE AT ELEVATED TEMPERATURES BY ADDITION OF PHOSPHORUS TO A HIGH PURITY Fe0 002% SALLOY

C. M. Liu1) , K. Abiko2) and M. Tanino2) 1) Schoolof Materials and Metallurgy , Northeastern University , Shenyang 110006 , China 2) Institute for Materials Research , Tohoku University , Sendai980 8579 , Japan

金属学报(英文版)

Theeffectof phosphorusonthehotductility andthesegregation ofsulfuratgrain boundariesin high purityironcontaining 0 002 % sulfur werequantitativelyinvestigated bytensiletestat973 K, SEMobservation of fracture surface and scanning Auger electron spectroscopy.Theexperimental resultscan besum marized a...

关键词: high purity iron , null , null , null

Low Ductility at Elevated Temperatures of the Cryogenic and Non-magnetic Steel Fe-23Mn-4Al-SCr-0.3C

TIAN Xing ZHANG Yansheng Dalian Railway Institute , Dalian , 116022 , China

材料科学技术（英文）

The origin of low ductility at elevated tempera- ture in the cryogenic and non-magnetic steel Fe-23Mn-4Al-5Cr-0.3C was investigated by means of impact test at elevated temperatures,opti- cal microscope,SEM and TEM.The experimental results indicate that the impact toughness lowers with increasing tes...

关键词: ductility , null , null , null , null

Acoustic Emission Monitoring the Fatigue Crack Growth in SM50B-Zc Steel

ZHU Zuming WA NG Zhongguang PENG Jun ** Laboratory of Fatigue and Fracture for Materials , Institute of Metal Research , Academia Sinica , Shenyang , 110015 , China.To whom correspondence should be addressed.

材料科学技术（英文）

The acoustic emission(AE)characteristics from the fatigue crack propagation in SM50B-Zc steel were strongly affected by the environment me- dium.The AE feature from the fatigue process both in air and in 3.5% NaCl aqueous solution mani- fested a periodicity which indicated the fatigue ex- tension wa...

关键词: acoustic emission , null , null , null , null

INTERGRANULAR FRACTURE OF AS-QUENCHED MARTENSITE IN HIGH CARBON STEELS

LIU Zongchang Baotou Iron and Steel University , China LIU Zongchang Associate Professor , Division of Materials and Heat Treatment , Baotou Iron and Steel University , Baotou , China

金属学报(英文版)

A mechanism of intergranular fracture of as-quenched martensite in high carbon steels has been proposed.When coarse grains of austenite transform to martensite,the grain plays a role of the unit of volume dilation,inhomogeneous strains necessarily produce and local microscop- ic stress concentration...

关键词: as-quench martensite , null , null

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