RU2012101012A

RU2012101012A - METHOD FOR PRODUCING PLATES FROM TWO-PHASE TITANIUM ALLOYS

Info

Publication number: RU2012101012A
Application number: RU2012101012/02A
Authority: RU
Inventors: Валерий Федорович Водолазский; Федор Валерьевич Водолазский; Александр Николаевич Козлов; Михаил Викторович Чащин
Original assignee: Открытое Акционерное Общество "Корпорация Всмпо-Ависма"
Priority date: 2012-01-11
Filing date: 2012-01-11
Publication date: 2013-07-20
Also published as: RU2492275C1

Abstract

Способ изготовления плит из двухфазных титановых сплавов, включающий горячее деформирование слитка в сляб, горячую прокатку и последующую термическую обработку плит, отличающийся тем, что горячее деформирование слитка в сляб производят в один этап и сразу же после достижения конечной толщины в процессе деформации сляба, его быстро охлаждают на глубину от поверхности от 20 до 30 мм со скоростью не менее 50°С/мин, последующую горячую продольную прокатку ведут на первой стадии в α+β-области от температуры нагрева Тн=(Т-20…40)°С малыми частными обжатиями со степенью деформации εот 3% до 5%, до суммарной степени деформации ε=25…30%, при этом выдерживают паузы между проходами продолжительностью от 8 до 12 с, а вторую стадию продольной прокатки проводят в β-области от температуры нагрева, которую определяют по формуле:Т≥(Т+(10×Мо+80))°С,где Т- температура нагрева сляба, °C;Т- температура полиморфного превращения, °С;Мо- молибденовый эквивалент, который рассчитывается по формуле:Мо=[Mo]+[V]/1,5+[Cr]·1,25+[Fe]·2,5+[Ni]/0,8, мас.%,последующие стадии прокатки производят в α+β-области с прерываниями и нагревами в продольных или в поперечных направлениях с суммарной степенью деформации после каждого прерывания ε до 60%.A method of manufacturing plates from two-phase titanium alloys, including hot deformation of an ingot into a slab, hot rolling and subsequent heat treatment of plates, characterized in that hot deformation of the ingot into a slab is performed in one step and immediately after reaching the final thickness in the process of deformation of the slab, it is quickly it is cooled to a depth from the surface from 20 to 30 mm at a speed of at least 50 ° C / min, the subsequent hot longitudinal rolling is carried out at the first stage in the α + β region from the heating temperature T = (T-20 ... 40) ° C with small partial about by compressions with the degree of deformation ε from 3% to 5%, to the total degree of deformation ε = 25 ... 30%, while pauses between passes are lasting from 8 to 12 s, and the second stage of longitudinal rolling is carried out in the β-region from the heating temperature, which determined by the formula: T≥ (T + (10 × Mo + 80)) ° C, where T is the slab heating temperature, ° C; T is the polymorphic transformation temperature, ° C; the molybdenum equivalent, which is calculated by the formula: Mo = [Mo] + [V] / 1.5 + [Cr] · 1.25 + [Fe] · 2.5 + [Ni] / 0.8, wt.%, The subsequent rolling stages are carried out in α + β- areas with interruptions and heatings in the food ial or in transverse directions with a total degree of deformation ε after each interruption to 60%.

Claims

A method of manufacturing plates from two-phase titanium alloys, including hot deformation of an ingot into a slab, hot rolling and subsequent heat treatment of plates, characterized in that hot deformation of the ingot into a slab is performed in one step and immediately after reaching the final thickness in the process of deformation of the slab, it is quickly it is cooled to a depth from the surface from 20 to 30 mm at a speed of at least 50 ° C / min, the subsequent hot longitudinal rolling is carried out at the first stage in the α + β region from the heating temperature T = (T _PP -20 ... 40) ° C small private crimping with a degree of deformation ε _i from 3% to 5%, up to a total degree of deformation ε = 25 ... 30%, with pauses between passes lasting from 8 to 12, and a second step of longitudinal rolling is carried out in the β-region of the heating temperature which is determined by the formula:

T _N ≥ (T _PP + (10 × Mo _EK +80)) ° С,

where T _N - the temperature of the slab, ° C;

T _PP - the temperature of the polymorphic transformation, ° C;

Mo _EC is the molybdenum equivalent, which is calculated by the formula:

Mo _EC = [Mo] + [V] / 1.5 + [Cr] · 1.25 + [Fe] · 2.5 + [Ni] / 0.8, wt.%,

subsequent rolling stages are performed in the α + β region with interruptions and heating in the longitudinal or transverse directions with a total degree of deformation after each interruption ε of up to 60%.