Compressive Fatigue Characteristics of WC-Co Based Alloys

TEM INVESTIGATIONS OF WC-Co ALLOYS AFTER CREEP EXPERIMENTS

Carbide tungsten cobalt alloys were deformed in compression or in three point bending in a temperature range 1000-1350°C and in a stress domain 30-1000MPa. In these conditions, the stress exponent n of WC-CO alloys is a function of only the cobalt volurnic ratio and tends tow rds n = 1 for pure B carbide. The apparent activation energy is 550 kj mole. T.E.M. investigations on pure carbide defor...

FRACTURE AND FATIGUE BEHAVIOR OF WC-Co AND WC-CoNi CEMENTED CARBIDES

The fracture and fatigue characteristics of several cemented carbide grades are investigated as a function of their microstructure. In doing so, the influence of binder chemical nature and content (Co and 76wt%Co-24wt%Ni), as well as carbide grain size on hardness, flexural strength, fracture toughness and fatigue crack growth (FCG) behavior is evaluated. Mechanical testing is combined with a d...

بررسی رفتار سایشی کامپوزیت‌های WC-10wt%Co تجاری، WC-40vol%Co و WC-40vol%FeAl-B در دمای محیط

در این پژوهش رفتار سایشی کامپوزیت‌های تجاری WC-10wt%Co (H10F)، WC-40vol%Co و کامپوزیت‌های WC-40vol%FeAl-B با مقادیر مختلف بور از صفر تا ppm1000 به روش پین روی دیسک بررسی شد. آزمون‌های سایش در دمای محیط، تحت بار 40 نیوتن و طی مسافت 100 متر انجام شدند. سطوح سایش به وسیله میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفت. نتایج نشان داد که در بین نمونه‌ها، کامپوزیت WC-40vol%FeAl بدون بور کمترین ...

Aqueous Processing of WC-Co Powders

The Influence of Carbon Content and Additions of Growth Inhibitors (V,Cr) on the Formation of Melt in WC-Co and WC-Ni Alloys

The start of melting as well as the melting range in WC-Co and WC-Ni hardmetals is significantly influenced by the alloy gross carbon content as well as by additives (V, Cr). Both Vanadium and Chromium significantly lower the start of melting but also broaden the melting range, in particular at low carbon content (formation of M6C-phases). As a result, a certain temperature range can be defined...