CN105648172A - Heat treatment process method for 0Cr13Ni8Mo2Al steel - Google Patents

Abstract

The invention provides a heat treatment process method for 0Cr13Ni8Mo2Al steel. The heat treatment process method is characterized in that the step of cold treatment is added between solution treatment and aging treatment and particularly comprises the following steps that A, solution treatment is conducted, the 0Cr13Ni8Mo2Al steel is heated to 925 DEG C+/-10 DEG C and subjected to heat preservation, and after solution treatment is completed, the 0Cr13Ni8Mo2Al steel is cooled to the room temperature; B, cold treatment is conducted, the 0Cr13Ni8Mo2Al steel which is cooled to the room temperature is cooled to minus 5 DEG C-minus 15 DEG C and subjected to heat preservation for 60-90 min; and C, aging treatment is conducted, the test piece subjected to cold treatment is put into a well type tempering furnace with forced air circulation to be subjected to aging treatment, the aging temperature is 540 DEG C, and air cooling is conducted after 4-hour heat preservation. After being subjected to heat treatment through the process method provided by the technical scheme of the invention, the treated steel is high in strength and good in fracture toughness and stress corrosion resistance, the performance index of an important force bearing component of an airplane is improved greatly, and the safe service life of the airplane is prolonged.

Description

A kind of 0Cr13Ni8Mo2Al steel heat treatment process method

Technical field

The present invention relates to the thermal treatment process field of PH Stainless Steel, in particular to a kind of 0Cr13Ni8Mo2Al steel heat treatment process method.

Background technology

Along with the development need of aircraft manufacturing, 0Cr13Ni8Mo2Al PH Stainless Steel selected by some aircrafts, and this material is the stainless refractory steel of high strength, but in order to obtain the good mechanical property of this type of alloy, it is necessary to select suitable thermal treatment process.

0Cr13Ni8Mo2Al steel divides hot rolling and forging two states, and this material needs to carry out starting material before upper machine is installed and used and checks and accepts and manufactured part thermal treatment. Never carry out Overheating Treatment technological test before this material, also do not have the detail file can be for reference. Mechanical property (tensile strength, yield strength, unit elongation, relative reduction in area and impact value) after heat-treating according to the processing method of standard use does not meet technical requirements completely, the mechanical property of test is defective, namely tensile strength and yield strength are worth tens to 100 MPas lower than testing requirement, carrying out again repeatedly heat treatment test afterwards, the performance of test still can not meet technical requirement.

Summary of the invention

It is an object of the invention to: after making 0Cr13Ni8Mo2Al steel heat-treat technique, reach airplane design performance requriements, after making this stainless material thermal treatment, can ensure, when plasticity and toughness are higher, there is very high intensity.

For solving this above-mentioned technical problem, inventive technique scheme provides a kind of 0Cr13Ni8Mo2Al steel heat treatment process method, deepfreeze step is added between solution treatment and ageing treatment, specifically comprise the following steps: A, solution treatment, 0Cr13Ni8Mo2Al steel being heated to 925 DEG C �� 10 DEG C and is incubated, solution treatment terminates enough to be cooled to room temperature;

B, deepfreeze, is cooled to-5 DEG C��-15 DEG C insulations 60��90 minutes by the 0Cr13Ni8Mo2Al steel after cool to room temperature;

C, ageing treatment, puts into the test specimen after deepfreeze the well formula tempering stove with forced air circulation and carries out ageing treatment, and aging temp is 540 DEG C, is incubated after 4 hours empty cold.

Preferably, in described step B, cooling temperature is-10 DEG C, and soaking time is 60 minutes.

After the processing method of technical solution of the present invention offer is heat-treated, processed steel can be made to obtain best combination of strength and toughness, the features such as intensity height, fracture toughness property and anti-stress corrosion performance are good substantially increase the important load-carrying member performance index of aircraft, it is to increase aircraft safe operating life.

Accompanying drawing explanation

Below accompanying drawing of the present invention is described:

Fig. 1 is heat-treatment technology method schema;

Fig. 2 is thermal treatment process figure.

Embodiment

Below in conjunction with example, the present invention is described in further detail:

0Cr13Ni8Mo2Al steel heat treatment process step is specific as follows. Should filling basket or colligation before shove charge, in air circulating oven, the sample coupon of heating, should be conducive to the circulation of air.

Step one, solution treatment

A) heat

Test specimen solution treatment carries out in air resistance furnace, adopts solid solution temperature to be 925 DEG C �� 10 DEG C, and the test specimen heat-treated rationally is placed process furnace planted agent, makes each test specimen energy uniform heat saturating.

B) it is incubated

Soaking time refers to that test specimen enters stove, and heating medium arrives solid solubility temperature lower limit, and test specimen is incubated in air furnace. Stainless steel solution treatment soaking time is with material specification THICKNESS CALCULATION. Soaking time is counted soaking time and is seen the following form 1 regulation entering stove from sample coupon. Repeat thermal treatment soaking time to reduce by half.

Table 1 stainless steel solution treatment soaking time specification

C) cool

Adopting oil to be chilled to room temperature after test specimen solution treatment, oil-quenching tank temperature should at 20��70 DEG C. Solution treatment terminates enough to be cooled to room temperature.

Step 2, deepfreeze

Test specimen after cooling sufficiently long and being as cold as room temperature is put into humidity cabinet, reduces temperature and to-5 DEG C��-15 DEG C and be incubated 60��90 minutes, and then carry out timeliness. Preferably, reduce temperature and to-10 DEG C and it is incubated 60 minutes.

Step 3, ageing treatment

Test specimen after deepfreeze being put into the well formula tempering stove with forced air circulation and carries out ageing treatment, aging temp is 540 DEG C, and insulation 4 little space-times are cold.

According to above-mentioned steps, 0Cr13Ni8Mo2A PH Stainless Steel is numbered 1-253, stove lot number 28m3188 heat-treats, and after thermal treatment, Mechanics Performance Testing is as follows: tensile strength 1445MPa, yield strength 1430MPa, unit elongation 13%, section 58%, impact value 120J.

Plane fracture toughness test is as follows:

Verifying by above over-all properties, 0Cr13Ni8Mo2A PH Stainless Steel increases by one deepfreeze (blank sample after solution treatment is put into humidity cabinet-5 DEG C��-15 DEG C insulations), and its thermal treatment process is completely necessary.

0Cr13Ni8Mo2Al steel reaches the research of the heat-treatment technology method of state needed for airplane design, 0Cr13Ni8Mo2Al steel rod can be solved significantly by the using state of supply status (hot rolling and forging state) to design requirements, by carrying out suitable thermal treatment process, material is made to obtain good mechanical property, in order to meet the service requirements of aircraft.

This material heat treatment process drawn is applied, and according to standard for acceptance detection, the 0Cr13Ni8Mo2Al steel vertical or horizontal tensile strength of rod, yield strength, unit elongation relative reduction in area, impelling strength, fracture toughness property and hardness all meet corresponding standard-required.

From grasp 0Cr13Ni8Mo2A PH Stainless Steel this gordian technique of deepfreeze temperature, each thermal treatment can reach good test effect, and mechanical property all meets corresponding technical requirements.

Claims (2)

1. a 0Cr13Ni8Mo2Al steel heat treatment process method, it is characterised in that, between solution treatment and ageing treatment, add deepfreeze step, specifically comprise the following steps:

A, solution treatment, is heated to 0Cr13Ni8Mo2Al steel 925 DEG C �� 10 DEG C and is incubated, and solution treatment terminates enough to be cooled to room temperature;

B, deepfreeze, is cooled to-5 DEG C��-15 DEG C insulations 60��90 minutes by the 0Cr13Ni8Mo2Al steel after cool to room temperature;

C, ageing treatment, puts into the test specimen after deepfreeze the well formula tempering stove with forced air circulation and carries out ageing treatment, and aging temp is 540 DEG C, is incubated after 4 hours empty cold.

2. method according to claim 1, it is characterised in that, in described step B, cooling temperature is-10 DEG C, and soaking time is 60 minutes.