CN1111100C

CN1111100C - Laminated steel plate and its production technique

Info

Publication number: CN1111100C
Application number: CN99106907A
Authority: CN
Inventors: 荆天辅; 张静武; 付万堂; 肖福仁
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 1999-05-16
Filing date: 1999-05-16
Publication date: 2003-06-11
Anticipated expiration: 2019-05-16
Also published as: CN1237490A

Abstract

The present invention belongs to the technical fields of engineering material and the manufacturing technology thereof. The novel laminated steel plate is characterized in that the preparing tissue a single-layer plate blank which contains 0.08 to 0.80% of C, less than 0.90% of Mn, less than 0.38% of Si, less than 1.30% of Cr, less than 0.90% of Mo, less than 0.36% of V, less than 0.03% of P, less than 0.03% of S and the rest percent of Fe is processed into martensite, tempered martensite or low bainite before a rolling process is carried out; a multi-pass warm rolling process and a multi-pass cold rolling process or a controlled rolling process and a controlled cooling process are carried out according to the tissue state and the prospective performance index of the plate blank to cause the total reduction to be larger than 50%; an aging treatment process is carried after the rolling process is finished, and the proportion of strength and toughness is adjusted to the prospective index. The novel laminated steel plate has a unique sheet-shaped composite structure of an endogenous microcosmic layer, the performance is excellent, and no low stress brittle fracture phenomenon occurs in the ultrahigh strength level. The novel laminated steel plate is suitable for manufacturing engineering structure components, such as pressure containers, high-pressure pipelines, plate springs, etc.

Description

A kind of laminated steel plate and manufacturing technology thereof

The invention belongs to engineering materials and manufacturing technology field thereof.

Make the history that very-high performance metal situ composite material has decades at home and abroad by viscous deformation.Mainly concentrate on superstrength copper-based material and alumina-base material aspect abroad.As yielding non-ferrous metals such as Cu-Nb, Cu-Fe, Cu-Ag and Al-Li.Late nineteen eighties, the Spitza and the co-worker thereof of U.S. Ames National Laboratory prepare Cu-Nb matrix material and wire rod by cold-rolling practice and cold-drawing process, and it is many and electroconductibility is higher than 70% of international standard annealed steel that intensity has improved twice.The S.I.Hong of 98 years Korea Ss and U.S. M.A.Hill have reported their new development by the Cu-Ag superstrength electro-conductive material aspect of cold drawn method preparation.Scholars such as Spitza claim that this class advanced composite material is ' metal/metal composite is brought out in viscous deformation ' (DISC material), ' in-situ composite ', ' situ composite material ' and ' microcosmic matrix material ', and this class Al-Li ' microcosmic matrix material that the scholars such as K.T.V.Rao of California, USA university will their development ' be called the Al-Li alloy.As seen the address of this class novel material is ununified yet, to the similar report of not seeing Fe base DISC investigation of materials aspect so far.

The preparation method of this DISC plate has embodied ' INTERFACE DESIGN ', the last word of ' texture control ' and Materials science such as ' reflections of material compound original position '.This plate manufacturing technology be different from one of principal feature of conventional steel plates rolling technique and controlled rolling technology be rolling before the structural state of blank be the oversaturated sosoloid of solute appropriateness, for steel plate, be martensite, tempered martensite or lower bainite, the blank of conventional art then is an annealed state; In the cold rolling of multi-pass heavy reduction or warm-rolling process and after rolling, blank is not carried out softening annealing handle; Need carry out ageing treatment after rolling.Studies show that the interior living complex effect of as-annealed condition is very weak, interior living complex effect raises with sosoloid concentration and strengthens, and still, the excessive concentration blank is easy to roll and splits.Compare with the manufacturing technology of conventional laminate sheet, the technological line of DISC technology is simple, and low cost of manufacture has very high performance price ratio.

The object of the present invention is to provide a kind of interior laminated steel plate and manufacturing technology thereof of giving birth to the synusia structure that have, this new engineering material has the synusia shape composite structure that is arranged parallel to each other of unique microcosmic, its manufacturing process is simple, production cost is low, mechanical property is superior, is suitable for making engineering components such as pressurized vessel, pressure piping, plate Huang.

This laminated steel plate and manufacturing technology thereof, it is characterized in that: chemical ingredients C0.08～0.80%, Mn＜0.90%, Si＜0.38%, Cr＜1.30%, Mo＜0.90%, V＜0.36%, P＜0.03%, S＜0.03%, all the other are Fe, and its weave construction is the microstructure layer sheet composite structure that the plate face that is parallel to each other to of spontaneous formation in the operation of rolling is arranged; Manufacturing process is: before rolling, the Preparedness Directorate of mentioned component single-layer slab is treated to martensite, tempered martensite or lower bainite, carry out multi-pass warm-rolling, cold rolling or controlled rolling and controlled cooling according to the structural state of slab and the performance index of expection, make its total reduction greater than 50 percent; Carry out ageing treatment after the pressure, intensity, plasticity and flexible proportioning are adjusted to expectation index.

Based on traditional metal materials, particularly some ' is harmful to ' weave construction generation and the regularity that disappears and the toughening effect of weak interface in the steel plate, the present invention is with ' INTERFACE DESIGN ', the last word of Materials science such as ' texture control ' and ' material compound reaction in ' is applied to the design of ultra-high strength and toughness laminate steel composite structure, invent this interior laminated steel plate and the manufacturing new technology thereof of giving birth to laminar structure that have, solved this world-famous puzzle of ultrahigh-strength steel low stress brittle fracture in the thin plate field.

The characteristics of this laminated steel plate and manufacturing technology thereof are:

One, is parallel to and gives birth to macroscopical layered composite structure that composite structure has replaced conventional laminate sheet in the microstructure layer sheet of plate face.Give birth to composite structure spontaneous formation in the operation of rolling in this microstructure layer sheet, studies show that, its physical essence for (100) plate texture homodisperse be embedded in and form in (111) texture matrix, the interlayer weak interface is (100) cleavage surface.The bonding strength of this weak interface increases with rolling draught and reduces, and raising with the timeliness temperature strengthens, and therefore, changes the index that draught and timeliness parameter can be adjusted to intensity, plasticity and the toughness of this plate expection.

Two, because the toughening effect on weak boundary, the stretching mechanical behavior of this plate cracks in body style and smooth sample roughly the same, the crackle area is during less than sample cross 14%, stress of fluidity and smooth sample suitable.This plate yield tensile ratio is greater than 98%, and unit elongation is greater than 10%, and relative reduction in area is 35-50%, and the ratio of stress corrosion fracture threshold value and fracture toughness is greater than 85%, from room temperature to the no ductile-brittle transition phenomenon of subzero 196 degree.

Three, traditional laminate steel is combined into through roller welding, soldering or explosive welding by multi-layered sheet, and the DISC plate is quite different, make through rolling by the individual layer plate of moderate thickness, technology is simple, production cost is low, performance is good, and all there is very quantum jump aspects such as the reliability (security) and the ratio of performance to price than conventional laminate sheet.The former is converted into macroscopical inner boundary with the thin plate outside surface, and the latter is that original position bears the microcosmic weak interface in homogeneous material.

This patented technology not only is applied to soft steel, medium carbon steel, also can be applicable to aluminium alloy, copper alloy and titanium alloy.

Claims

1, a kind of laminated steel plate is characterized in that: Chemical Composition C 0.08～0.80%, Mn＜0.90%, Si＜0.38%, Cr＜1.30%, Mo＜0.90%, V＜0.36%, P＜0.03%, S＜0.03%, all the other are Fe; Its weave construction is the microstructure layer sheet composite structure that the plate face that is parallel to each other to of spontaneous formation in the operation of rolling is arranged.

2, a kind of method of making the described laminated steel plate of claim 1, it is characterized in that: before rolling, the Preparedness Directorate of mentioned component single-layer slab is treated to martensite, tempered martensite or lower bainite, carry out multi-pass warm-rolling, cold rolling or controlled rolling and controlled cooling according to the structural state of slab and the performance index of expection, make its total reduction greater than 50 percent; Carry out ageing treatment after rolling, intensity, plasticity and flexible proportioning are adjusted to expectation index.