阅读说明：本技术 一种用于金属件表面热处理工艺 (Surface heat treatment process for metal piece ) 是由 陈新 韩长青 王国华 于 2019-10-22 设计创作，主要内容包括：一种用于金属件表面热处理工艺,工艺包括以下步骤：金属件在盐酸溶液中酸洗处理,处理后期进行超声波处理,依次把待热处理的金属板放入加热炉中烧制以备用；已经热处理的金属板通过水溶液浸泡,实现金属表面热处理除锈；将金属件放入到真空加热机中通过激光火焰喷射进行加热,接着将正火后的金属件转移到盐浴炉内,接着将金属件转移到空气炉中保温,将退火后的金属件转移至淬火炉内进行高温淬火,本发明一种用于金属件表面热处理工艺,可以在保证性能的前提下,节约了能源消耗,降低生产成本,提高了抗拉强度与断后伸长率,同时减防止氧化皮的脱落,减少金属工件形变,保证金属工件质量。(A process for the thermal treatment of the surface of a metallic article, the process comprising the steps of: pickling the metal piece in a hydrochloric acid solution, performing ultrasonic treatment at the later stage of treatment, and sequentially putting the metal plate to be subjected to heat treatment into a heating furnace for burning for later use; soaking the heat-treated metal plate in an aqueous solution to realize the heat treatment rust removal on the metal surface; the metal piece is placed into a vacuum heater to be heated through laser flame spraying, the normalized metal piece is transferred into a salt bath furnace, the metal piece is transferred into an air furnace to be insulated, and the annealed metal piece is transferred into a quenching furnace to be quenched at high temperature.)

1. A process for the thermal treatment of the surface of a metal piece, characterized in that it comprises the following steps:

the method comprises the following steps: pickling the metal piece in a hydrochloric acid solution, performing ultrasonic treatment at the later stage of treatment, and finally sequentially washing with purified water and drying for later use;

step two: heating the heating furnace to 1550-;

step three: soaking the heat-treated metal plate in an aqueous solution for 12-15 minutes to realize the heat treatment rust removal on the metal surface;

putting the metal piece into a vacuum heater, heating the metal piece to 1020 ℃ by laser flame spraying, and continuously heating for 15 minutes;

step five: transferring the normalized metal piece into a salt bath furnace until the temperature of the metal piece is reduced to 600-650 ℃, and then transferring the metal piece into an air furnace for heat preservation;

step six: preserving the heat of the quenched metal piece in a quenching furnace, transferring the annealed metal piece into the quenching furnace for high-temperature quenching, wherein the quenching time is 5-7 h;

step seven: cooling to 110 deg.c, and washing and stoving the workpiece with 15.5% concentration water solution of polyalkylene glycol polymer as cooling medium to complete the heat treatment process.

2. A process for the thermal treatment of a surface of a metallic article according to claim 1, wherein: the concentration of the hydrochloric acid solution in the first step is 12.5%.

3. A process for the thermal treatment of a surface of a metallic article according to claim 1, wherein: and putting the metal plate in the second step into a heating furnace for firing for 25-35 minutes.

4. A process for the thermal treatment of a surface of a metallic article according to claim 1, wherein: the components in the step three treatment process are prepared by mixing ethanol, sodium hydroxide and deionized water according to the proportion of 1.5:2.3: 3.1.

5. A process for the thermal treatment of a surface of a metallic article according to claim 1, wherein: the temperature of the air furnace in the step five annealing process is 780-830 ℃, and the heat preservation time is 100-120 min.

Technical Field

The invention relates to a surface heat treatment process for a metal piece, and relates to the field of heat treatment of metal pieces.

Background

The heat treatment process generally comprises three processes of heating, heat preservation and cooling, and sometimes only comprises two processes of heating and cooling. The processes are connected with each other and are not interrupted; the existing metal heat treatment process generally has less times of heating and tempering, the heat treatment effect is often not expected, and metal is easy to have more residual processing stress, which directly influences the service life.

At present, the existing metal surface heat treatment technology has the defects of large deformation of a metal workpiece and high cost due to single process, and a new metal surface heat treatment process needs to be researched by technical personnel in the field.

Disclosure of Invention

The technical problem to be solved by the invention is to provide the heat treatment process for the surface of the metal piece, which aims at overcoming the defects of the prior art, and can save energy consumption, reduce production cost, improve tensile strength and elongation after fracture, simultaneously prevent oxide skin from falling off, reduce metal workpiece deformation and ensure the quality of the metal workpiece on the premise of ensuring performance.

A process for heat treating a surface of a metal article, the process comprising the steps of:

the method comprises the following steps: pickling the metal piece in a hydrochloric acid solution, performing ultrasonic treatment at the later stage of treatment, and finally sequentially washing with purified water and drying for later use;

step two: heating the heating furnace to 1550-;

step three: soaking the heat-treated metal plate in an aqueous solution for 12-15 minutes to realize the heat treatment rust removal on the metal surface;

putting the metal piece into a vacuum heater, heating the metal piece to 1020 ℃ by laser flame spraying, and continuously heating for 15 minutes;

step five: transferring the normalized metal piece into a salt bath furnace until the temperature of the metal piece is reduced to 600-650 ℃, and then transferring the metal piece into an air furnace for heat preservation;

step six: preserving the heat of the quenched metal piece in a quenching furnace, transferring the annealed metal piece into the quenching furnace for high-temperature quenching, wherein the quenching time is 5-7 h;

step seven: cooling to 110 deg.c, and washing and stoving the workpiece with 15.5% concentration water solution of polyalkylene glycol polymer as cooling medium to complete the heat treatment process.

Further, the concentration of the hydrochloric acid solution in the first step is 12.5%.

Further, the metal plate in the second step is placed into a heating furnace to be fired for 25-35 minutes.

Further, the components in the treatment process in the third step are prepared by mixing ethanol, sodium hydroxide and deionized water according to the ratio of 1.5:2.3: 3.1.

Further, the temperature of the air furnace in the step five annealing process is 780-830 ℃, and the heat preservation time is

100-120min。

Has the advantages that: a heat treatment process for the surface of a metal part can save energy consumption, reduce production cost, improve tensile strength and elongation after fracture, simultaneously reduce and prevent oxide skin from falling off, reduce the deformation of a metal workpiece and ensure the quality of the metal workpiece on the premise of ensuring the performance.

Detailed Description

The present invention will be described in further detail by way of examples.