induction surface hardening 4140 alloy steel

Comparison of Through-Induction Hardening with

Sep 08, 2015 · The AISI Bar Steel Fatigue Database contains data for SAE 4140 low alloy steel which was through hardened using both conventional and through-induction hardening. While the data was developed for bar stock as opposed to fabricated parts, it does provide a means of comparing the fatigue properties for the two heat treating methods. Effect of Surface Hardening Technique and Case Depth on Surface hardening techniques are widely used to improve the rolling contact fatigue (RCF) resistance of materials. This study investigated the RCF resistance of hardened, ground steel rods made from three different aircraft-quality alloy steels (AISI 8620, 9310, and 4140) and hardened using different techniques (atmosphere carburizing, vacuum carburizing, and induction hardening) at different case depths.

Flame Hardening 4140 & Other Steel Grades - ThermTech

FLAME HARDENING. Process of Flame Hardening 4140 & Other Steel Grades of Machined Parts and Stampings. Flame hardening sometimes begins with a preheat operation depending on the alloy and degree of machining. Below is an outline of the process that follows thereafter: Hardening of Steels - Surface Hardening, Nitriding, Flame Oct 31, 2003 · Surface Hardening. Nitriding. Flame Hardening. Induction Hardening. Background:Hardenability is the term used to describe the effect of various elements on the transformation characteristics of steels and the resultant microstructure after cooling from the austenitising (or hardening) temperature. Depth of Hardening Heat Treating 4140 steel FAQ :anvilfire How-to.1) 4140 is an OK die steel but is not recommended for radical shaped dies such as narrow fullering, crown and so on. 2) Fully hardened 4140 ranges from 54 to 59 HRC. But it should be tempered for any heavy use. 3) Tempering recommendations from the ASM heat treaters guide for 4140-4142 is a minimum of 400°F. This leaves near full hardness.

Induction Hardening and Flame Hardening at Metlab of

Induction hardening is a process used for the surface hardening of steel and other alloy components. The parts to be heat treated are placed inside a water cooled copper coil and then heated above their transformation temperature by applying an alternating current to the coil. Induction Hardening of Gears and Critical Components surface hardness, core hardness, hardness pro le, residual stress distribution, grade of steel and the prior microstructure of the steel. In contrast to carburizing and nitriding, induction hardening does not require heating the whole gear. With induction, heating can be localized to only those areas in which metallurgical changes are required. Principles of Induction Hardening and Inspectionthe use of alloy steels. Examples of alloy steels used in induction hardening are SAE 4140, 4150, 4340, 5150, 5140, and 52100. Typical Applications. Induction hardening can be used for a wide range of parts, and prom-inent examples are discussed in separate articles in

Tips for Successful Induction Hardening of Steels

Jan 13, 2005 · Certain alloy steels even with medium carbon content (AISI 4140 and 4340, for example) are prone to cracking under rapid cooling during spray quenching, and, therefore, require special considerations. This situation can be amplified when hardening complex shaped parts.Heat-Treating & Hardening 4140 Steel - Material Jun 30, 2006 · 4140 is not case hardened by carburizing but it is frequently induction hardened to the hardness and depth you desire and beyond. If you want the core to be softer you can first normalize, or quench & temper in a furnace to the desired lower hardness level. This treatment also prepares the near surface for optimum induction hardening response.