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Friday, July 31, 2020 | History

2 edition of nature and stability of precipitates in ti-containing HSLA steels found in the catalog.

nature and stability of precipitates in ti-containing HSLA steels

Zhi-Xin Chen

nature and stability of precipitates in ti-containing HSLA steels

by Zhi-Xin Chen

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  • 29 Currently reading

Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Birmingham, Dept of Metallurgy and Materials.

Statementby Zhi-Xin Chen.
ID Numbers
Open LibraryOL13869752M

This is a collection of papers presented at the joint conference of the 7th International Conference on High Strength Low Alloy Steels (HSLA Steels ), the International Conference on Microalloying (Microalloying ), and the International Conference on Offshore Engineering Steels The thermal stability of the TiN precipitates provides control of boundary migration compared to other microalloy additions but steelmaking controls required to produce the optimum precipitate size distribution can be difficult to consistently achieve. The 6 th Int’l Conf. on High Strength Low Alloy Steels, Beijing, China, Google.

However, no study has been found which report niobium G-phase in ordinary 18/12 steels. Ni 3 Ti and related precipitates Precipitates such as Ni 3 Ti, Ni 3 (Ti,Al), are only found in a particular class of austenitic stainless steels: the precipitation hardening ones. A typical steel in this category is A, a 15CrNi-Al-Ti steel.   Dual phase steels (DP-steels) consisting of ferrite and martensite can be easily produced in steel industry, which however give impact toughness lower than J at strength level of – GPa.

  These steels can be categorized as (i) plain C steels, (ii) high strength low alloy (HSLA) steels, (iii) quenched and tempered (QT) steels, (iv) heat treatable low alloy (HTLA) steels, and (v) pre-coated steels. To understand weldability of steels, it is necessary to have knowledge about the various weld regions. Characteristic features of welds. The high-temperature creep properties of a series of alumina-forming austenitic (AFA) stainless steels based on FeNi-()Cr-()Al-()NbC (weight percent) were studied. Computational thermodynamics were used to aid in the interpretation of data on microstructural stability, phase equilibria, and creep resistance.


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Nature and stability of precipitates in ti-containing HSLA steels by Zhi-Xin Chen Download PDF EPUB FB2

The chemical composition of the investigated Ti micro-alloyed HSLA steel is given in Table steel is a kind of commercial weather resistant steel containing a little Cu, Cr and Ni, which can improve corrosion resistance of the steel in the specimen was prepared by vacuum induction melting and continuous casting to slab, soaked at °C for 20 min, and water-quenched Cited by:   The precipitates formed in a HSLA steel containing CrMnMoNbNiCuC at different temperatures were studied using transmission electron microscope.

The selected area diffraction and EDS analysis were used to identify the by: The HSLA steels contain various alloying additions such as Cr, Mn, Mo, Cu and Ni apart from niobium and carbon.

Precipitation of carbonitrides in these steels is complex in nature due to. Austenite-grain growth was investigated in a couple of microalloyed steels, one containing Ti and the other containing Nb, Ti, and V, using different reheating temperatures between K and Thermodynamic Calculations and Precipitation Simulations of HSLA Steels.

Shan Jin. Thermo‐Calc Software AB, Norra Stationsga Stockholm, Sweden. Search for more papers by this author. Qing Chen. Thermo‐Calc Software AB, Norra Stationsga Stockholm, by: 1. Conventional high-strength low-alloy (HSLA) steels are strengthened by a combination of grain refinement, solid-solution strengthening and precipitation hardening.

HSLA steels usually possess yield strengths of about – MPa, and the contribution of precipitation hardening to these values was considered to be minor, since many of the.

The mean particle size of ZrN precipitates in hypo-Zr steel S1 is approximately 25 nm, much smaller than that in hyper-Zr steel S2. Holding at °C for 1 min leads to a slight increase in ZrN precipitate size from 25 to 50 nm for hypo-Zr steel S1, which can be employed to suppress the austenite grain growth during welding, especially in the.

As-cast CC slabs of microalloyed steels are prone to surface and sub-surface cracking. Precipitation phenomena initiated during solidification reduce.

High-Strength Low-Alloy Steels Introduction and Overview High-strength low-alloy (HSLA) steels, or microalloyed steels, are designed to provide better mechanical properties and/or greater resistance to atmospheric corrosion than conventional carbon steels.

They are not considered to be alloy steels in the normal sense because they are. This presentation focuses on the thermodynamic modeling and precipitation simulation of high strength, low alloy (HSLA) steels. Thermodynamic calculations using Thermo-Calc can be used to predict the underlying thermodynamics of multicomponent alloys of industrial importance; phase equilibrium and phase transformation information by taking into.

Precipitation hardening is one of the oldest yet effective methods in improving the mechanical properties of steels. Various precipitates [1,2,3,4] have been used to produce high grade steels with strength that is greater than 1 itation also plays a very important role in stabilizing the microstructure, inhibiting grain growth, and suppressing the recrystallization of steels with.

Microalloying elements in steels, such Nb, facilitate grain refinement through precipitation of carbides/carbonitrides in austenite thereby inhibiting the static recrystallisation of austen-ite, resulting in a fine final microstructure.

In addition, titanium has frequently been added to HSLA steels to. was used for the prediction of nature, fraction and stability of V-precipitates in the investigated steels, Fig.

As per the prediction, under equilibrium cooling condition, precipitation starts at higher temperature (~ °C) in low-carbon high nitrogen, LCHN, steel than that in high. The effect of Mo addition on the precipitation of carbides both in austenite and ferrite of Nb-bearing HSLA steel were investigated by stress relaxation and transmission electron microscopy (TEM).

Experimental results showed that the addition of ~ wt.% Mo into Nb-bearing steel slightly accelerated the precipitation kinetics of Nb carbides. High-strength low-alloy steels are designed to provide specific desirable combinations of properties, such as strength, toughness, formability, weldability, and corrosion resistance.

purpose of this study is to find and to explain the influence of different factors on fatigue crack initiation and the nature of crack propagation in HSLA. The precipitation behavior of a commercial high-strength low-alloy (HSLA) steel microalloyed with wt pct Nb and wt pct Ti has been investigated using transmission electron microscopy (TEM) and mechanical testing.

The emphasis of this study is to compare an industrially hot-rolled steel and samples from a laboratory hot torsion machine simulation. High-Strength Low-Alloy (HSLA) Precipitation Strengthened Steels: Naval Applications HY (High Yield) Carbon content wt.% Microstructure in heat-affected zone (HAZ) susceptible to hydrogen- induced cracking High degree of preheat, post-weld heating, and stringent control requirements on welding processes increases processing costs HSLA.

Precipitation in Ti–Nb Al-killed microalloyed HSLA steels (Ti/N weight ratio from to 1) was investigated in both the as-rolled and the normalised conditions using analytical electron. 4 Recently, Liu[20] developed a model to predict the equilibrium mole fractions of precipitates Ti(C,N), MnS and Ti4C2S2 in microalloyed steel.

The solubility products are calculated from standard Gibbs energies, and accounts for the interaction between alloying elements and the mutual solubility of. This is a collection of papers presented at the joint conference of the 7th International Conference on High Strength Low Alloy Steels (HSLA Steels ), the International Conference on Microalloying (Microalloying ), and the International Conference on Offshore Engineering Steels.

The precipitation behavior of a commercial high-strength low-alloy (HSLA) steel microalloyed with wt pct Nb and wt pct Ti has been investigated using transmission electron microscopy.

Austenite-grain growth was investigated in a couple of microalloyed steels, one containing Ti and the other containing Nb, Ti, and V, using different reheating temperatures between K and K ( °C and °C).

Nature and distribution of microalloy precipitates were quantitatively analyzed before and after reheating.Precipitation hardening of high-strength low-alloy steels by nanometer-sized carbides Article in Materials Science and Engineering A (1) January with Reads How we measure.