Tungsten Alloy Strain Hardening Process Principle

Strain hardening is the use of a metal ( or alloy ) hardening principle , in the deformation of the material deformation under pressure to change and improve the organization of defects in tungsten alloy quantity, distribution and organizational structure of the alloy , thereby enhancing the strength of the material of an enhanced technique . In the strain hardening process, the deformation properties of tungsten alloy has a very significant impact. With the increase of the deformation , the tensile strength and hardness increase and decrease ductility . The beginning of deformation, strengthening the role of apparent when deformation of > 15%, the strengthening effect gradually weakened . Strength with the increase of the deformation , when the hardness is gradually increased to a certain value, it no longer increases with the increase of the deformation has changed significantly. The tungsten content of 95 % tungsten alloy , when the deformation amount of 15 %, the hardness reaches the maximum. The universal deformation strengthening process, the amount of deformation is 15 % and the maximum deformation of not more than 25% tungsten alloy or microcracks internally , cracking and lead to destruction . Aging the alloy after deformation processing , the tensile strength can be further improved . Strain age hardening temperature is usually in the 500-600 ℃. In this temperature range , and annealing interface has strengthen tungsten particles , so that the strength of the compression deformation of 32% of 90W-Ni-Fe alloy , aging in 600C th, tensile strength of 1530MPa or more can be achieved . Annealing above 600 ℃ , with the annealing temperature, the strength and hardness decreased , elongation recovery , when the annealing temperature reaches above 1200 ℃ , the occurrence of recrystallization , intensity and sintering heat treatment extends to its original state levels.

In order to significantly improve the mechanical properties of tungsten alloys , in recent years , the development of large deformation advanced tungsten alloy strain hardening technology . Large deformation strength than ordinary forging state to raise more than 300MPa . Large deformation and deformation generally through several intermediate annealing cycle process and implementation, the deformation and deformation cycles have a great relationship with the technology in the forging process of cyclic deformation on the piece several times and intermediate annealing treatment can achieve a large deformation strengthening . The purpose is to eliminate intermediate annealing deformation stress generated during processing , reduce the processing hardening , annealing temperature range is generally at 500-1000 ℃. In addition , in recent years the development of some of the more advanced large deformation hardening process , such as static extrusion, hot extrusion , hot-rolled or hot extruded ( hot ) with forged composite deformation technique , it can achieve a very large amount of deformation the tungsten alloy showed fibrous microstructure of the alloy strengthening effect is very significant, and thus more people pay attention .




Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-alloy.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

• < Prev
• Next >